Wolf 489: Difference between revisions

Gliese 518
Observation data; Epoch J2000 Equinox J2000
Constellation	Template:Constel
Right ascension	13h 36m 31.81s
Declination	+03° 40′ 45.″
Apparent magnitude (V)	14.66
Characteristics
Spectral type	DZ10.0
Apparent magnitude (B)	15.59
Apparent magnitude (V)	14.63
Apparent magnitude (R)	14.0
Apparent magnitude (I)	14.1
Apparent magnitude (J)	13.06
Apparent magnitude (H)	12.82
Apparent magnitude (K)	12.69
Astrometry
Proper motion (μ)	RA: -3706 mas/yr ; Dec.: -1149 mas/yr
Parallax (π)	121.4 ± 3.4 mas
Distance	26.9 ± 0.8 ly ; (8.2 ± 0.2 pc)
Absolute magnitude (MV)	15.08
Details
Mass	0.55 ± 0.03 M☉
Radius	0.013 R☉
Surface gravity (log g)	7.95 ± 0.02 cgs
Temperature	5030 ± 120 K
Age	5.19 Gyr
Other designations
	WD 1334+039, Wolf 489, LHS 46, LFT 1023, LTT 13961, NLTT 34618, G 062-053, G 62-53, G 64-4, EGGR 100, 2MASS J13363181+0340458, USNO-B1.0 0936-00229354
Database references
SIMBAD	data

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Gliese 518 (WD 1334+039, LHS 46, G 062-053, Wolf 489) is a nearby degenerate star (white dwarf) of spectral class DZ10.0^[2]^[3]), the single known component of the system, located in the constellation Template:Constel.

Distance

Gliese 518, probably, is the 12th closest white dwarf, or, possibly, 9th–14th (see Gliese 293, GJ 1087, Gliese 915, GJ 1276 and Gliese 318). Its trigonometric parallax from YPC (Yale Parallax Catalog) is 121.4 ± 3.4 mas,^[4] corresponding to a distance 8.24 ± 0.23 pc, or 26.87 ± 0.75 ly.

Gliese 518 parallax data

Source	Paper	Parallax, mas	Distance, pc	Distance, ly	Ref.
Woolley (1970)	Woolley et al., 1970	135 ± 12	7.4 ± 0.7	24.2 ± 2.1	^[5]
GJ, 3rd version	Gliese, Jahreiss, 1991	122.2 ± 3.9	8.18 ± 0.26	26.69 ± 0.85	^[6]
YPC, 4th edition	van Altena et al., 1995	121.4 ± 3.4	8.24 ± 0.23	26.87 ± 0.75	^[4]

Physical parameters

Gliese 518's mass is 0.55 ± 0.03 Solar masses,^[2] its surface gravity is 10^{7.95 ± 0.02} (8.91 · 10⁷) cm·s⁻²,^[2] or approximately 91 000 of Earth's, corresponding to a radius 9089 km, or 143% of Earth's.

Gliese 518's temperature is 5030 ± 120 K^[2] (comparable with that of early K-type main sequence stars); its cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star) is 5.19 Gyr.^[3] Despite its official classification as "white dwarf", Gliese 518 is not actually white due to low temperature, and should appear the same color as K-type main sequence stars, often referred to as "orange dwarfs".

Notes

^ From apparent magnitude and parallax.
^ From surface gravity and mass.
^ White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star)

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t "GJ 518 -- White Dwarf". Centre de Données astronomiques de Strasbourg. Retrieved 2011-11-02.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m Holberg, J. B. (2008). "A NEW LOOK AT THE LOCAL WHITE DWARF POPULATION". The Astronomical Journal. 135: 1225–1238. Bibcode:2008AJ....135.1225H. doi:10.1088/0004-6256/135/4/1225. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
^ ^a ^b ^c ^d ^e ^f ^g Sion, Edward M. (2009). "THE WHITE DWARFS WITHIN 20 PARSECS OF THE SUN: KINEMATICS AND STATISTICS". The Astronomical Journal. 138: 1681–1689. arXiv:0910.1288. Bibcode:2009AJ....138.1681S. doi:10.1088/0004-6256/138/6/1681. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
^ ^a ^b ^c ^d ^e Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
^ Stars within 25 pc of the Sun (Woolley+ 1970)
^ Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)

[note_1-5] From apparent magnitude and parallax.

[note_2-6] From surface gravity and mass.

[note_3-7] White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star)

[Simbad-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t "GJ 518 -- White Dwarf". Centre de Données astronomiques de Strasbourg. Retrieved 2011-11-02.

[Holberg2008-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m Holberg, J. B. (2008). "A NEW LOOK AT THE LOCAL WHITE DWARF POPULATION". The Astronomical Journal. 135: 1225–1238. Bibcode:2008AJ....135.1225H. doi:10.1088/0004-6256/135/4/1225. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

[Sion2009-3] ^ ^a ^b ^c ^d ^e ^f ^g Sion, Edward M. (2009). "THE WHITE DWARFS WITHIN 20 PARSECS OF THE SUN: KINEMATICS AND STATISTICS". The Astronomical Journal. 138: 1681–1689. arXiv:0910.1288. Bibcode:2009AJ....138.1681S. doi:10.1088/0004-6256/138/6/1681. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

[Yale-4] Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)

[Wo-8] Stars within 25 pc of the Sun (Woolley+ 1970)

[GJ-9] Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)

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Observation data Epoch J2000^[1] Equinox J2000^[1]
Constellation	Template:Constel
Right ascension	13^h 36^m 31.81^s^[1]
Declination	+03° 40′ 45.″^[1]
Apparent magnitude (V)	14.66^[2]
Characteristics
Spectral type	DZ10.0^[2]^[3]
Apparent magnitude (B)	15.59^[1]
Apparent magnitude (V)	14.63^[1]
Apparent magnitude (R)	14.0^[1]
Apparent magnitude (I)	14.1^[1]
Apparent magnitude (J)	13.06^[1]
Apparent magnitude (H)	12.82^[1]
Apparent magnitude (K)	12.69^[1]
Astrometry

Proper motion (μ)	RA: -3706^[3] mas/yr Dec.: -1149^[3] mas/yr
Parallax (π)	121.4 ± 3.4 mas^[4]
Distance	26.9 ± 0.8 ly (8.2 ± 0.2 pc)
Absolute magnitude (M_V)	15.08^[2]^[4]^{[note 1]}

Details

Mass	0.55 ± 0.03^[2] `M`_☉
Radius	0.013^[2]^{[note 2]} `R`_☉
Surface gravity (log g)	7.95 ± 0.02^[2] cgs
Temperature	5030 ± 120^[2] K
Age	5.19^[3]^{[note 3]} Gyr

Other designations
WD 1334+039,^[2]^[3] Wolf 489,^[1] LHS 46,^[2] LFT 1023,^[1] LTT 13961,^[1] NLTT 34618,^[1] G 062-053,^[4] G 62-53,^[1] G 64-4,^[1] EGGR 100,^[1] 2MASS J13363181+0340458,^[1] USNO-B1.0 0936-00229354^[1]
Database references
SIMBAD	data