dwarf Comparison Table

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dwarf comparison table

Subject has material has absorption line has energy generating mass has synonym has rotational period at equator has period has luminosity class has prototype has right ascension has acronym has rotational period at pole has declination has mean density has inclination of rotational axis to pole of ecliptic is usually part of has absolute bolometric magnitude has relative abundance has magnetic field has rotation velocity has proper motion has galactic orbital period has luminosity is a kind of has wavelength has central temperature has observable variation time scale has age has escape velocity has galactic orbital velocity has surface temperature is part of has definition has amplitude has distance has number of star has B-V magnitude has rotational velocity has frequency has name designated with has mean rotation spe has surface gravity has light curve has mass has abundance has optical brightness variation has author is an instance of has color has distance from galactic center has radiu has been observ has acceptance statu obey has velocity has central density has density at surface has apparent magnitude has spectral type has energy source has distance from galactic plane has observational problem has velocity relative to nearby star has absolute visual magnitude has V magnitude has lifetime

AE Aurigae hydrogen, helium He II main sequence star V rare very high 35000 K Auriga Runaway star which diverges from a comparatively small area in Orion. greater than 0.08 the sun's mass dwarf blue-white determined from proper motion and radial velocity O9.5 V gravitational contraction and or fusion 3 to 6 million years

Alpha Caeli hydrogen, helium HR 1502 V 4 40 33.6 -41 51 50 asterism 6000 to 7500 K Milky Way 0.34 greater than 0.08 the sun's mass naked eye star yellow-white for many centuries determined from proper motion and radial velocity brighter than 5 F2V gravitational contraction and or fusion 4.45

alpha Centauri hydrogen, helium HR 5459 80 years V 14 39 36.2 -60 50 07 asterism 3'.68 per year 5000 to 6000 K Milky Way A binary star whose components have G2 V and K5 V spectral types. The nearest star system to the Sun and the third brightest star in the night sky. 4.35 light-years 2 0.71 greater than 0.08 the sun's mass half the stars in the solar neighborhood are members of star systems naked eye star yellowish for many centuries determined from proper motion and radial velocity brighter than 5 G2V gravitational contraction and or fusion -0.01

Alpha Cephei hydrogen, helium H I HR 8162 V 21 18 34.7 +62 35 08 asterism 10000 K Milky Way 0.22 greater than 0.08 the sun's mass naked eye star white for many centuries determined from proper motion and radial velocity brighter than 5 A7V gravitational contraction and or fusion 2.44

Alpha Comae Berenices hydrogen, helium HR 4969 V 13 09 59.2 +17 31 46 6000 to 7500 K Coma Berenices 0.00 greater than 0.08 the sun's mass dwarf yellow-white determined from proper motion and radial velocity F5V gravitational contraction and or fusion 5.22

Alpha Coronae Autralis hydrogen, helium H I HR 7254 V 19 09 28.2 -37 54 16 asterism 10000 K Milky Way 0.04 greater than 0.08 the sun's mass naked eye star white for many centuries determined from proper motion and radial velocity brighter than 5 A2V gravitational contraction and or fusion 4.11

Alpha Coronae Borealis hydrogen, helium H I HR 5793 V 15 34 41.2 +26 42 53 asterism 10000 K Milky Way -0.02 greater than 0.08 the sun's mass naked eye star white for many centuries determined from proper motion and radial velocity brighter than 5 A0V gravitational contraction and or fusion 2.23

Alpha Fornacis hydrogen, helium HR 963 V 03 12 04.2 -28 59 14 asterism 6000 to 7500 K Milky Way 0.52 greater than 0.08 the sun's mass naked eye star yellow-white for many centuries determined from proper motion and radial velocity brighter than 5 F8V gravitational contraction and or fusion 3.87

Alpha Lacertae hydrogen, helium H I HR 8585 V 22 31 17.4 +50 16 57 asterism 10000 K Milky Way 0.01 greater than 0.08 the sun's mass naked eye star white for many centuries determined from proper motion and radial velocity brighter than 5 A1V gravitational contraction and or fusion 3.77

Alpha Leonis hydrogen, helium He I HR 3982 V 10 8 22.3 +11 58 2 asterism 11000 to 28000 K Milky Way -0.11 greater than 0.08 the sun's mass naked eye star blue-white for many centuries determined from proper motion and radial velocity brighter than 5 B7V gravitational contraction and or fusion 1.35

Alpha Mensae hydrogen, helium HR 2261 V 06 10 14.6 -74 45 11 5000 to 6000 K Mensa 0.72 greater than 0.08 the sun's mass dwarf yellowish determined from proper motion and radial velocity G6V gravitational contraction and or fusion 5.09

Altair hydrogen, helium H I HR 7557 V 19 50 46.9 +08 52 06 asterism 10000 K Milky Way A bright A7 V star. 4.8 pc 0.22 greater than 0.08 the sun's mass naked eye star white for many centuries determined from proper motion and radial velocity m_v = 0.78 A7 V gravitational contraction and or fusion 0.77

Beta Librae hydrogen, helium He I HR 5685 V 15 17 0.3 -9 22 59 asterism 11000 to 28000 K Milky Way -0.11 greater than 0.08 the sun's mass naked eye star blue-white for many centuries determined from proper motion and radial velocity brighter than 5 B8V gravitational contraction and or fusion 2.61

black dwarf hydrogen, helium main sequence star V MACHO massive compact halo object inversely proportional to its momentum greater than 1000 Kelvin dark halo The final stage in the evolution of a star of roughly 1 M_sun. It is a mass of cold, electron-degenerate gas, and can no longer radiate energy, because the whole star is in its lowest energy state. No black dwarfs have ever been observed. Also, an object (M < 0.085 M_sun) that is not massive enough to achieve nuclear chain reactions. inversely proportional to the wavelength greater than 0.08 the sun's mass hypothetical uncertainty principle determined from proper motion and radial velocity gravitational contraction and or fusion

blue dwarf hydrogen, helium main sequence star V dwarf greater than 1000 Kelvin High-temperature star (as opposed to red stars). Blue dwarfs represent the very dense, but very small, near-final form of what was once a red giant. greater than 0.08 the sun's mass determined from proper motion and radial velocity gravitational contraction and or fusion

brown dwarf hydrogen, helium main sequence star V MACHO massive compact halo object inversely proportional to its momentum greater than 1000 Kelvin dark halo A self-gravitating, self-luminous gaseous object which is not sufficiently massive to result in thermonuclear hydrogen fusion reactions in its core and cannot therefore be considered a star. Such objects are expected to have a mass less than 7% of the Sun's mass and represent a "missing link" between low-mass stars and gas giant planets like Jupiter (at 0.1% of the Sun's mass). inversely proportional to the wavelength 1 to 8 percent of the Sun hypothetical uncertainty principle determined from proper motion and radial velocity gravitational contraction and or fusion

Epsilon Eri hydrogen, helium main sequence star V 3600 to 5000 K Eridanus In 1973 van de Kamp announced that this star has a planet-like object in orbit around it at a distance of about 8 AU and with a period of about 25 years. 3.30 pc greater than 0.08 the sun's mass dwarf orange to red determined from proper motion and radial velocity 4 K2 V gravitational contraction and or fusion

Epsilon Eridani hydrogen, helium main sequence star V greater than 1000 Kelvin Eridanus A young orange dwarf star that is visible to the naked eye. 10.7 light-years greater than 0.08 the sun's mass dwarf determined from proper motion and radial velocity gravitational contraction and or fusion

Epsilon Indi hydrogen, helium main sequence star V greater than 1000 Kelvin An old orange dwarf star in the southern constellation Indus. 11.2 light-years greater than 0.08 the sun's mass dwarf determined from proper motion and radial velocity gravitational contraction and or fusion

Fomalhaut hydrogen, helium H I HR 8728 V 22 57 39.0 -29 37 20 asterism 10000 K Milky Way An A star. The brightest star in the constellation Piscis Austrinus. 7 pc 0.09 greater than 0.08 the sun's mass naked eye star white for many centuries determined from proper motion and radial velocity brighter than 5 A3 V gravitational contraction and or fusion 1.16

Kruger 60 AB hydrogen, helium main sequence star V greater than 1000 Kelvin A faint dM binary in the Solar neighborhood. It may be a subluminous star. 3.93 pc 2 greater than 0.08 the sun's mass half the stars in the solar neighborhood are members of star systems binary star determined from proper motion and radial velocity 12 cooler than G2 gravitational contraction and or fusion

red dwarf hydrogen, helium main sequence star V dwarf greater than 1000 Kelvin A main-sequence star with spectral type M. Red dwarfs are much fainter, cooler, and smaller than the Sun but are the most common type of star in the Galaxy, accounting for 70 percent of all stars. greater than 0.08 the sun's mass 70 percent of all stars determined from proper motion and radial velocity M gravitational contraction and or fusion

Regulus hydrogen, helium He I alpha Leo V 11000 to 28000 K Leo A visual triple B8 V star. 26 pc greater than 0.08 the sun's mass dwarf blue-white determined from proper motion and radial velocity B8 V gravitational contraction and or fusion

RW Aurigae hydrogen, helium nebular variable V within a period of decades 5000 to 6000 K A T Tauri star with a strong ultraviolet excess.
R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name
RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted
AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted
V 335, V 336, etc., when the double letter designations are exhausted
greater than 0.08 the sun's mass 0.2 magnitudes or greater dwarf yellowish determined from proper motion and radial velocity G5e V gravitational contraction and or fusion some difficulty in distinguishing between various kinds

Sirius hydrogen, helium H I HR 2491 V 6 45 8.9 -16 42 58 asterism 10000 K Milky Way The brightest star in the sky. Its companion (Sirius B) is a white dwarf of about 0.96 M_sun but only about 0.03 R_sun, the nearest white dwarf to Earth. 8.6 light-years 2 0.00 greater than 0.08 the sun's mass half the stars in the solar neighborhood are members of star systems binary star white for many centuries determined from proper motion and radial velocity brighter than 5 A1Vm gravitational contraction and or fusion -1.46

Sun 0.35 M_sun disk star 24^d6^h V (main-sequence) 35 days 1.409 g cm^-3 7�15' M_bol = +4.67 1-2 gauss as high as 10-1000 gauss in active regions 220 million years (e ≈ 0) 3.83 × 10³³ ergs s^-1 14-15 × 10⁶ K 4.6 billion years V_esc = 618 km s^-1 V_orb = 250-300 km s^-1 5785 K disk Star that Earth orbits. Central body of solar system. It takes about 1-10 million years for photons to diffuse from the Sun's interior to its surface. About 3% of the energy radiated is in the form of neutrinos. Every second about 655 million tons of H are being converted into 650 million tons of He. A grazing light ray is deflected 1".7 by the Sun. If the total angular momentum of the solar system were concentrated in the Sun, its equatorial rotation speed would be about 100 km s^-1. 1.9 km s^-1 27398 cm s^-2 1.989 × 10³³ g Baade (1944) naked eye object yellowish 27000 light-years 695990 km 155 g cm^-3 (Bahcall 1973) 3 × 10^-7 g cm^-3 -26.74 G2 proton-proton reaction 35 light-years 20 km s^-1 toward R.A. 18^h4^m, declination +30� (towards in Hercules) M_v = +4.85

Theta2 Orionis hydrogen, helium He II 2U 0525-06 V rare very high 35000 K Orion A spectroscopic binary tentatively identified with 2U 0525-06. 2 greater than 0.08 the sun's mass half the stars in the solar neighborhood are members of star systems dwarf blue-white determined from proper motion and radial velocity O9.5 Vp gravitational contraction and or fusion 3 to 6 million years

UV Ceti star hydrogen, helium main sequence star V UV Ceti dwarf greater than 1000 Kelvin Late-type dwarfs with spectra showing hydrogen emission lines. greater than 0.08 the sun's mass determined from proper motion and radial velocity dKe star, dMe star gravitational contraction and or fusion

Vega hydrogen, helium H I HR 7001 V 18 36 56.2 +38 47 01 asterism 10000 K Milky Way The fifth brightest star in the night sky. 25 light-years 0.00 greater than 0.08 the sun's mass naked eye star white for many centuries determined from proper motion and radial velocity brighter than 5 A0Va gravitational contraction and or fusion 0.03

Zeta Ophiuchi hydrogen, helium He II main sequence star V rare very high 35000 K Ophiuchus A reddened O star (a runaway star from the Sco-Cen association) with a high rotational velocity. It is well known for its strong interstellar absorption lines in the visible part of the spectrum. 170 pc 396 km s^-1 greater than 0.08 the sun's mass dwarf blue-white determined from proper motion and radial velocity O9.5 V gravitational contraction and or fusion 3 to 6 million years

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Subject	has material	has absorption line	has energy generating mass	has synonym	has rotational period at equator	has period	has luminosity class	has prototype	has right ascension	has acronym	has rotational period at pole	has declination	has mean density	has inclination of rotational axis to pole of ecliptic	is usually part of	has absolute bolometric magnitude	has relative abundance	has magnetic field	has rotation velocity	has proper motion	has galactic orbital period	has luminosity	is a kind of	has wavelength	has central temperature	has observable variation time scale	has age	has escape velocity	has galactic orbital velocity	has surface temperature	is part of	has definition	has amplitude	has distance	has number of star	has B-V magnitude	has rotational velocity	has frequency	has name designated with	has mean rotation spe	has surface gravity	has light curve	has mass	has abundance	has optical brightness variation	has author	is an instance of	has color	has distance from galactic center	has radiu	has been observ	has acceptance statu	obey	has velocity	has central density	has density at surface	has apparent magnitude	has spectral type	has energy source	has distance from galactic plane	has observational problem	has velocity relative to nearby star	has absolute visual magnitude	has V magnitude	has lifetime
AE Aurigae	hydrogen, helium	He II		main sequence star			V										rare		very high											35000 K	Auriga	Runaway star which diverges from a comparatively small area in Orion.											greater than 0.08 the sun's mass				dwarf	blue-white						determined from proper motion and radial velocity				O9.5 V	gravitational contraction and or fusion						3 to 6 million years
Alpha Caeli	hydrogen, helium			HR 1502			V		4 40 33.6			-41 51 50			asterism															6000 to 7500 K	Milky Way					0.34							greater than 0.08 the sun's mass				naked eye star	yellow-white			for many centuries			determined from proper motion and radial velocity			brighter than 5	F2V	gravitational contraction and or fusion					4.45
alpha Centauri	hydrogen, helium			HR 5459		80 years	V		14 39 36.2			-60 50 07			asterism					3'.68 per year										5000 to 6000 K	Milky Way	A binary star whose components have G2 V and K5 V spectral types. The nearest star system to the Sun and the third brightest star in the night sky.		4.35 light-years	2	0.71							greater than 0.08 the sun's mass	half the stars in the solar neighborhood are members of star systems			naked eye star	yellowish			for many centuries			determined from proper motion and radial velocity			brighter than 5	G2V	gravitational contraction and or fusion					-0.01
Alpha Cephei	hydrogen, helium	H I		HR 8162			V		21 18 34.7			+62 35 08			asterism															10000 K	Milky Way					0.22							greater than 0.08 the sun's mass				naked eye star	white			for many centuries			determined from proper motion and radial velocity			brighter than 5	A7V	gravitational contraction and or fusion					2.44
Alpha Comae Berenices	hydrogen, helium			HR 4969			V		13 09 59.2			+17 31 46																		6000 to 7500 K	Coma Berenices					0.00							greater than 0.08 the sun's mass				dwarf	yellow-white						determined from proper motion and radial velocity				F5V	gravitational contraction and or fusion					5.22
Alpha Coronae Autralis	hydrogen, helium	H I		HR 7254			V		19 09 28.2			-37 54 16			asterism															10000 K	Milky Way					0.04							greater than 0.08 the sun's mass				naked eye star	white			for many centuries			determined from proper motion and radial velocity			brighter than 5	A2V	gravitational contraction and or fusion					4.11
Alpha Coronae Borealis	hydrogen, helium	H I		HR 5793			V		15 34 41.2			+26 42 53			asterism															10000 K	Milky Way					-0.02							greater than 0.08 the sun's mass				naked eye star	white			for many centuries			determined from proper motion and radial velocity			brighter than 5	A0V	gravitational contraction and or fusion					2.23
Alpha Fornacis	hydrogen, helium			HR 963			V		03 12 04.2			-28 59 14			asterism															6000 to 7500 K	Milky Way					0.52							greater than 0.08 the sun's mass				naked eye star	yellow-white			for many centuries			determined from proper motion and radial velocity			brighter than 5	F8V	gravitational contraction and or fusion					3.87
Alpha Lacertae	hydrogen, helium	H I		HR 8585			V		22 31 17.4			+50 16 57			asterism															10000 K	Milky Way					0.01							greater than 0.08 the sun's mass				naked eye star	white			for many centuries			determined from proper motion and radial velocity			brighter than 5	A1V	gravitational contraction and or fusion					3.77
Alpha Leonis	hydrogen, helium	He I		HR 3982			V		10 8 22.3			+11 58 2			asterism															11000 to 28000 K	Milky Way					-0.11							greater than 0.08 the sun's mass				naked eye star	blue-white			for many centuries			determined from proper motion and radial velocity			brighter than 5	B7V	gravitational contraction and or fusion					1.35
Alpha Mensae	hydrogen, helium			HR 2261			V		06 10 14.6			-74 45 11																		5000 to 6000 K	Mensa					0.72							greater than 0.08 the sun's mass				dwarf	yellowish						determined from proper motion and radial velocity				G6V	gravitational contraction and or fusion					5.09
Altair	hydrogen, helium	H I		HR 7557			V		19 50 46.9			+08 52 06			asterism															10000 K	Milky Way	A bright A7 V star.		4.8 pc		0.22							greater than 0.08 the sun's mass				naked eye star	white			for many centuries			determined from proper motion and radial velocity			m_v = 0.78	A7 V	gravitational contraction and or fusion					0.77
Beta Librae	hydrogen, helium	He I		HR 5685			V		15 17 0.3			-9 22 59			asterism															11000 to 28000 K	Milky Way					-0.11							greater than 0.08 the sun's mass				naked eye star	blue-white			for many centuries			determined from proper motion and radial velocity			brighter than 5	B8V	gravitational contraction and or fusion					2.61
black dwarf	hydrogen, helium			main sequence star			V			MACHO													massive compact halo object	inversely proportional to its momentum						greater than 1000 Kelvin	dark halo	The final stage in the evolution of a star of roughly 1 M_sun. It is a mass of cold, electron-degenerate gas, and can no longer radiate energy, because the whole star is in its lowest energy state. No black dwarfs have ever been observed. Also, an object (M < 0.085 M_sun) that is not massive enough to achieve nuclear chain reactions.						inversely proportional to the wavelength					greater than 0.08 the sun's mass									hypothetical	uncertainty principle	determined from proper motion and radial velocity					gravitational contraction and or fusion
blue dwarf	hydrogen, helium			main sequence star			V																dwarf							greater than 1000 Kelvin		High-temperature star (as opposed to red stars). Blue dwarfs represent the very dense, but very small, near-final form of what was once a red giant.											greater than 0.08 the sun's mass											determined from proper motion and radial velocity					gravitational contraction and or fusion
brown dwarf	hydrogen, helium			main sequence star			V			MACHO													massive compact halo object	inversely proportional to its momentum						greater than 1000 Kelvin	dark halo	A self-gravitating, self-luminous gaseous object which is not sufficiently massive to result in thermonuclear hydrogen fusion reactions in its core and cannot therefore be considered a star. Such objects are expected to have a mass less than 7% of the Sun's mass and represent a "missing link" between low-mass stars and gas giant planets like Jupiter (at 0.1% of the Sun's mass).						inversely proportional to the wavelength					1 to 8 percent of the Sun									hypothetical	uncertainty principle	determined from proper motion and radial velocity					gravitational contraction and or fusion
Epsilon Eri	hydrogen, helium			main sequence star			V																							3600 to 5000 K	Eridanus	In 1973 van de Kamp announced that this star has a planet-like object in orbit around it at a distance of about 8 AU and with a period of about 25 years.		3.30 pc									greater than 0.08 the sun's mass				dwarf	orange to red						determined from proper motion and radial velocity			4	K2 V	gravitational contraction and or fusion
Epsilon Eridani	hydrogen, helium			main sequence star			V																							greater than 1000 Kelvin	Eridanus	A young orange dwarf star that is visible to the naked eye.		10.7 light-years									greater than 0.08 the sun's mass				dwarf							determined from proper motion and radial velocity					gravitational contraction and or fusion
Epsilon Indi	hydrogen, helium			main sequence star			V																							greater than 1000 Kelvin		An old orange dwarf star in the southern constellation Indus.		11.2 light-years									greater than 0.08 the sun's mass				dwarf							determined from proper motion and radial velocity					gravitational contraction and or fusion
Fomalhaut	hydrogen, helium	H I		HR 8728			V		22 57 39.0			-29 37 20			asterism															10000 K	Milky Way	An A star. The brightest star in the constellation Piscis Austrinus.		7 pc		0.09							greater than 0.08 the sun's mass				naked eye star	white			for many centuries			determined from proper motion and radial velocity			brighter than 5	A3 V	gravitational contraction and or fusion					1.16
Kruger 60 AB	hydrogen, helium			main sequence star			V																							greater than 1000 Kelvin		A faint dM binary in the Solar neighborhood. It may be a subluminous star.		3.93 pc	2								greater than 0.08 the sun's mass	half the stars in the solar neighborhood are members of star systems			binary star							determined from proper motion and radial velocity			12	cooler than G2	gravitational contraction and or fusion
red dwarf	hydrogen, helium			main sequence star			V																dwarf							greater than 1000 Kelvin		A main-sequence star with spectral type M. Red dwarfs are much fainter, cooler, and smaller than the Sun but are the most common type of star in the Galaxy, accounting for 70 percent of all stars.											greater than 0.08 the sun's mass	70 percent of all stars										determined from proper motion and radial velocity				M	gravitational contraction and or fusion
Regulus	hydrogen, helium	He I		alpha Leo			V																							11000 to 28000 K	Leo	A visual triple B8 V star.		26 pc									greater than 0.08 the sun's mass				dwarf	blue-white						determined from proper motion and radial velocity				B8 V	gravitational contraction and or fusion
RW Aurigae	hydrogen, helium			nebular variable			V																			within a period of decades				5000 to 6000 K		A T Tauri star with a strong ultraviolet excess.							R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted V 335, V 336, etc., when the double letter designations are exhausted				greater than 0.08 the sun's mass		0.2 magnitudes or greater		dwarf	yellowish						determined from proper motion and radial velocity				G5e V	gravitational contraction and or fusion		some difficulty in distinguishing between various kinds
Sirius	hydrogen, helium	H I		HR 2491			V		6 45 8.9			-16 42 58			asterism															10000 K	Milky Way	The brightest star in the sky. Its companion (Sirius B) is a white dwarf of about 0.96 M_sun but only about 0.03 R_sun, the nearest white dwarf to Earth.		8.6 light-years	2	0.00							greater than 0.08 the sun's mass	half the stars in the solar neighborhood are members of star systems			binary star	white			for many centuries			determined from proper motion and radial velocity			brighter than 5	A1Vm	gravitational contraction and or fusion					-1.46
Sun			0.35 M_sun	disk star	24^d6^h		V (main-sequence)				35 days		1.409 g cm^-3	7�15'		M_bol = +4.67		1-2 gauss as high as 10-1000 gauss in active regions			220 million years (e ≈ 0)	3.83 × 10³³ ergs s^-1			14-15 × 10⁶ K		4.6 billion years	V_esc = 618 km s^-1	V_orb = 250-300 km s^-1	5785 K	disk	Star that Earth orbits. Central body of solar system. It takes about 1-10 million years for photons to diffuse from the Sun's interior to its surface. About 3% of the energy radiated is in the form of neutrinos. Every second about 655 million tons of H are being converted into 650 million tons of He. A grazing light ray is deflected 1".7 by the Sun. If the total angular momentum of the solar system were concentrated in the Sun, its equatorial rotation speed would be about 100 km s^-1.								1.9 km s^-1	27398 cm s^-2		1.989 × 10³³ g			Baade (1944)	naked eye object	yellowish	27000 light-years	695990 km					155 g cm^-3 (Bahcall 1973)	3 × 10^-7 g cm^-3	-26.74	G2	proton-proton reaction	35 light-years		20 km s^-1 toward R.A. 18^h4^m, declination +30� (towards in Hercules)	M_v = +4.85
Theta2 Orionis	hydrogen, helium	He II		2U 0525-06			V										rare		very high											35000 K	Orion	A spectroscopic binary tentatively identified with 2U 0525-06.			2								greater than 0.08 the sun's mass	half the stars in the solar neighborhood are members of star systems			dwarf	blue-white						determined from proper motion and radial velocity				O9.5 Vp	gravitational contraction and or fusion						3 to 6 million years
UV Ceti star	hydrogen, helium			main sequence star			V	UV Ceti															dwarf							greater than 1000 Kelvin		Late-type dwarfs with spectra showing hydrogen emission lines.											greater than 0.08 the sun's mass											determined from proper motion and radial velocity				dKe star, dMe star	gravitational contraction and or fusion
Vega	hydrogen, helium	H I		HR 7001			V		18 36 56.2			+38 47 01			asterism															10000 K	Milky Way	The fifth brightest star in the night sky.		25 light-years		0.00							greater than 0.08 the sun's mass				naked eye star	white			for many centuries			determined from proper motion and radial velocity			brighter than 5	A0Va	gravitational contraction and or fusion					0.03
Zeta Ophiuchi	hydrogen, helium	He II		main sequence star			V										rare		very high											35000 K	Ophiuchus	A reddened O star (a runaway star from the Sco-Cen association) with a high rotational velocity. It is well known for its strong interstellar absorption lines in the visible part of the spectrum.		170 pc			396 km s^-1						greater than 0.08 the sun's mass				dwarf	blue-white						determined from proper motion and radial velocity				O9.5 V	gravitational contraction and or fusion						3 to 6 million years