naked eye object Comparison Table

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naked eye object comparison table

Subject has material has energy generating mass has synonym has rotational period at equator has elliptical orbit has luminosity class has angular resolving power has acronym has launch vehicle has note has rotational period at pole has ground communication station has purpose has owner has mean density has Messier number has image produce has position on celestial sphere has inclination of rotational axis to pole of ecliptic has primary mirror shape has product has optical design is usually part of has absolute bolometric magnitude has effective diameter has launch location has magnetic field orbit has focal ratio has operator has classification criterion has galactic orbital period has orbital inclination has catalog has time of occurrence has luminosity is a kind of has central temperature has age has orbital period has escape velocity has radial velocity has duration has galactic orbital velocity has attitude control has surface temperature has parallax is part of has definition has distance has energy production has secondary mirror shape has mirror maker has surface density has wavelength sensitivity has most luminous member has creator has mean rotation spe has surface gravity has mass has mounting manufacturer has approximately elliptical orbit has average interval time has author has mount is an instance of has reference has color has distance from galactic center has radiu has been observ has symbol has velocity has radiation at surface has aperture has mirror diameter has central density has mirror type has composition has density at surface has NED data has location have orbit decay date has energy source has distance from galactic plane has illuminating star(s) has velocity relative to nearby star has absolute visual magnitude has creation date has launch date

Andromeda galaxy M 31 originally to catalog all objects which could be confused with a comet Subdivided according to the openness of the spiral arms as Sa spiral, Sb spiral or Sc spiral. Messier catalog celestial sphere The largest member of the local group. It is a giant spiral galaxy that lies 2.4 million light-years away. determined from Cepheid period-luminosity relation 10¹⁰ to 10¹² M_sun Messier object or center of gravity

h and Chi Persei double cluster in Perseus catalog about star systems Perseus A double stellar association. It contains many young O and B stars and also many M supergiants. 2 kpc naked eye object or center of gravity

Hubble Space Telescope 500 km altitude, 35 degree inclination 0.05 arcseconds HST observe celestial objects Space Telescope Science Institute concave hyperboloid 2.1 meters Earth f/12.9, 30, 48, 96 Hubble Space Telescope. A space-based reflecting telescope with a primary mirror diameter of 2.4 m (94 in) capable of high-resolution imaging from the far ultraviolet to the near infrared. A joint NASA/ESA mission. Launched in 1990 with a planned lifetime of 15 years. Encountered reduced performance when the mirror was found to have spherical aberration. Solved by the installation of corrective optics (COSTAR) in 1994. convex hyperboloid Perkin Elmer 300 to 1000 nanometers Lockheed 3-axis-stabilized spacecraft optical telescope Hubble Space Telescope from CADC 2.4 m equal to aperture (except for Schmidt which has aperture smaller than mirror diameter) Corning ULE glass Earth orbit 1990 1986

Hyades Aldebaran is a foreground star in that region of the sky, it is not a member of the Hyades. open cluster catalog 5 × 10⁸ yr + 36 km s^-1 disk 40 pc naked eye object spectral types A1-K or center of gravity

Magellanic Cloud galaxy catalog naked eye object Two small irregular (or possibly barred spiral) galaxies (satellites of the Milky Way galaxy) about 50-60 kpc (LMC, in Dorado) and 60-70 kpc (SMC, in Toucana) distant, visible to the naked eye from the southern hemisphere. Both clouds contain mainly Population I stars. The LMC contains numerous ob stars and at least 10 stars that are an order of magnitude brighter (m_v = - 9) than any supergiants known in our galaxy. It also contains several times our galaxy's concentration of interstellar matter. or center of gravity

meteor shooting star sonic boom meteorite (if meteoroid does not burn up) naked eye object A "shooting star" - the streak of light in the sky produced by the transit of a meteoroid through the Earth's atmosphere; also the glowing meteoroid itself. The term "fireball" is sometimes used for a meteor approaching the brightness of Venus; the term "bolide" for one approaching the brightness of the full Moon. one per hour from a given location on Earth, higher during meteorite shower or center of gravity

Milky Way Subdivided according to the openness of the spiral arms as Sa spiral, Sb spiral or Sc spiral. galaxy catalog Local Group A softly glowing band of light that bisects the skies of Earth, produced by light from stars and nebulae in the galactic disk. determined from Cepheid period-luminosity relation 10¹⁰ to 10¹² M_sun hypergalaxy or center of gravity

naked eye star hydrogen, helium from the point of view of Earth asterism star catalog naked eye object greater than 1000 Kelvin from the point of view of Earth's orbit Milky Way A star visible without visual aids which takes place primarily within the core which depends on luminosity class greater than 0.08 the sun's mass for many centuries determined from proper motion and radial velocity which is diffused out from the hotter core or center of gravity gravitational contraction and or fusion

Orion Nebula M 42 originally to catalog all objects which could be confused with a comet 42 gaseous nebula catalog 20000 years gas The Orion Nebula, a star-forming region in the constellation Orion. 500 pc Messier object ionized hydrogen or center of gravity trapezium

Pleiades NGC 1432 originally to catalog all objects which could be confused with a comet 45 open cluster catalog very young disk 125 pc Messier object B star, late star or center of gravity

Praesepe NGC 2632 originally to catalog all objects which could be confused with a comet 44 open cluster catalog varies widely disk 160 pc naked eye object or center of gravity

Sun 0.35 M_sun disk star 24^d6^h V (main-sequence) 35 days 1.409 g cm^-3 from the point of view of Earth 7�15' M_bol = +4.67 1-2 gauss as high as 10-1000 gauss in active regions 220 million years (e ≈ 0) star catalog 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 from the point of view of Earth's orbit 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. which takes place primarily within the core which depends on luminosity class 1.9 km s^-1 27398 cm s^-2 1.989 × 10³³ g Baade (1944) naked eye object yellowish 27000 light-years 695990 km d which is diffused out from the hotter core 155 g cm^-3 (Bahcall 1973) 3 × 10^-7 g cm^-3 or center of gravity 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

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Subject	has material	has energy generating mass	has synonym	has rotational period at equator	has elliptical orbit	has luminosity class	has angular resolving power	has acronym	has launch vehicle	has note	has rotational period at pole	has ground communication station	has purpose	has owner	has mean density	has Messier number	has image	produce	has position on celestial sphere	has inclination of rotational axis to pole of ecliptic	has primary mirror shape	has product	has optical design	is usually part of	has absolute bolometric magnitude	has effective diameter	has launch location	has magnetic field	orbit	has focal ratio	has operator	has classification criterion	has galactic orbital period	has orbital inclination	has catalog	has time of occurrence	has luminosity	is a kind of	has central temperature	has age	has orbital period	has escape velocity	has radial velocity	has duration	has galactic orbital velocity	has attitude control	has surface temperature	has parallax	is part of	has definition	has distance	has energy production	has secondary mirror shape	has mirror maker	has surface density	has wavelength sensitivity	has most luminous member	has creator	has mean rotation spe	has surface gravity	has mass	has mounting manufacturer	has approximately elliptical orbit	has average interval time	has author	has mount	is an instance of	has reference	has color	has distance from galactic center	has radiu	has been observ	has symbol	has velocity	has radiation at surface	has aperture	has mirror diameter	has central density	has mirror type	has composition	has density at surface	has NED data	has location	have orbit decay date	has energy source	has distance from galactic plane	has illuminating star(s)	has velocity relative to nearby star	has absolute visual magnitude	has creation date	has launch date
Andromeda galaxy			M 31										originally to catalog all objects which could be confused with a comet																			Subdivided according to the openness of the spiral arms as Sa spiral, Sb spiral or Sc spiral.			Messier catalog														celestial sphere	The largest member of the local group. It is a giant spiral galaxy that lies 2.4 million light-years away.	determined from Cepheid period-luminosity relation										10¹⁰ to 10¹² M_sun						Messier object																or center of gravity
h and Chi Persei			double cluster in Perseus																																catalog about star systems														Perseus	A double stellar association. It contains many young O and B stars and also many M supergiants.	2 kpc																naked eye object																or center of gravity
Hubble Space Telescope					500 km altitude, 35 degree inclination		0.05 arcseconds	HST					observe celestial objects	Space Telescope Science Institute							concave hyperboloid					2.1 meters			Earth	f/12.9, 30, 48, 96																				Hubble Space Telescope. A space-based reflecting telescope with a primary mirror diameter of 2.4 m (94 in) capable of high-resolution imaging from the far ultraviolet to the near infrared. A joint NASA/ESA mission. Launched in 1990 with a planned lifetime of 15 years. Encountered reduced performance when the mirror was found to have spherical aberration. Solved by the installation of corrective optics (COSTAR) in 1994.			convex hyperboloid	Perkin Elmer		300 to 1000 nanometers						Lockheed				3-axis-stabilized spacecraft	optical telescope	Hubble Space Telescope from CADC								2.4 m	equal to aperture (except for Schmidt which has aperture smaller than mirror diameter)		Corning ULE glass				Earth orbit							1990	1986
Hyades										Aldebaran is a foreground star in that region of the sky, it is not a member of the Hyades.																									open cluster catalog					5 × 10⁸ yr			+ 36 km s^-1						disk		40 pc																naked eye object													spectral types A1-K			or center of gravity
Magellanic Cloud																																			galaxy catalog			naked eye object												Two small irregular (or possibly barred spiral) galaxies (satellites of the Milky Way galaxy) about 50-60 kpc (LMC, in Dorado) and 60-70 kpc (SMC, in Toucana) distant, visible to the naked eye from the southern hemisphere. Both clouds contain mainly Population I stars. The LMC contains numerous ob stars and at least 10 stars that are an order of magnitude brighter (m_v = - 9) than any supergiants known in our galaxy. It also contains several times our galaxy's concentration of interstellar matter.																																	or center of gravity
meteor			shooting star															sonic boom				meteorite (if meteoroid does not burn up)																naked eye object												A "shooting star" - the streak of light in the sky produced by the transit of a meteoroid through the Earth's atmosphere; also the glowing meteoroid itself. The term "fireball" is sometimes used for a meteor approaching the brightness of Venus; the term "bolide" for one approaching the brightness of the full Moon.														one per hour from a given location on Earth, higher during meteorite shower																			or center of gravity
Milky Way																																Subdivided according to the openness of the spiral arms as Sa spiral, Sb spiral or Sc spiral.			galaxy catalog														Local Group	A softly glowing band of light that bisects the skies of Earth, produced by light from stars and nebulae in the galactic disk.	determined from Cepheid period-luminosity relation										10¹⁰ to 10¹² M_sun						hypergalaxy																or center of gravity
naked eye star	hydrogen, helium																		from the point of view of Earth					asterism											star catalog			naked eye object									greater than 1000 Kelvin	from the point of view of Earth's orbit	Milky Way	A star visible without visual aids		which takes place primarily within the core			which depends on luminosity class						greater than 0.08 the sun's mass											for many centuries		determined from proper motion and radial velocity	which is diffused out from the hotter core								or center of gravity		gravitational contraction and or fusion
Orion Nebula			M 42										originally to catalog all objects which could be confused with a comet			42																			gaseous nebula catalog					20000 years									gas	The Orion Nebula, a star-forming region in the constellation Orion.	500 pc																Messier object													ionized hydrogen			or center of gravity				trapezium
Pleiades			NGC 1432										originally to catalog all objects which could be confused with a comet			45																			open cluster catalog					very young									disk		125 pc																Messier object													B star, late star			or center of gravity
Praesepe			NGC 2632										originally to catalog all objects which could be confused with a comet			44																			open cluster catalog					varies widely									disk		160 pc																naked eye object																or center of gravity
Sun		0.35 M_sun	disk star	24^d6^h		V (main-sequence)					35 days				1.409 g cm^-3				from the point of view of Earth	7�15'					M_bol = +4.67			1-2 gauss as high as 10-1000 gauss in active regions					220 million years (e ≈ 0)		star catalog		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	from the point of view of Earth's orbit	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.		which takes place primarily within the core			which depends on luminosity class				1.9 km s^-1	27398 cm s^-2	1.989 × 10³³ g				Baade (1944)		naked eye object		yellowish	27000 light-years	695990 km		d		which is diffused out from the hotter core			155 g cm^-3 (Bahcall 1973)			3 × 10^-7 g cm^-3		or center of gravity		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