LP 658-2 White dwarf star in the constellation Orion
LP 658-2
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation Orion [ 1]
Right ascension 05h 55m 09.53049s [ 2]
Declination −04° 10′ 07.0653″ [ 2]
Apparent magnitude (V)14.488[ 3]
Characteristics
Evolutionary stage white dwarf [ 3]
Spectral type DZ11.8[ 3]
Apparent magnitude (B)15.49[ 4]
Apparent magnitude (V)
14.488[ 3]
Apparent magnitude (RKC )
13.99[ 5]
Apparent magnitude (IKC )
13.51[ 5]
Apparent magnitude (J)
13.05 ± 0.03[ 5]
Apparent magnitude (H)
12.86 ± 0.03[ 5]
Apparent magnitude (KS )
12.78 ± 0.03[ 5]
B−V color index
1.0[ 4] [ 3]
Astrometry Proper motion (μ) RA: mas /yr [ 2] Dec.: mas /yr [ 2] Parallax (π)155.2373± 0.0175 mas [ 2] Distance 21.010 ± 0.002 ly pc ) Absolute magnitude (MV )15.44 ± 0.03[ 5] Details[ 3] From Holberg etal. (2008) Mass ± 0.01 M ☉ Radius 0.014[ 3] [ note 1] R ☉ Surface gravity (log g )± 0.02[ 3] cgs Temperature ± 70[ 3] K Age 6.42[ 6] [ note 2] Gyr Details[ 5] From Subasavage etal. (2009) Mass ± 0.01 M ☉ Radius 0.010 R ☉ Surface gravity (log g )± 0.01 cgs Temperature ± 70 K Age ± 0.02[ note 2] Gyr Other designations HL 4, GJ 223.2GJ 9193 , EG GR 45G 99-44G 106-12LHS 32LP 658-2NLTT 15811WD 0552-041[ 4] Database references SIMBAD data
LP 658-2 is a degenerate (white dwarf ) star in the constellation of Orion ,[ 4] apparent visual magnitude of approximately 14.488.[ 3]
Distance
According to a 2009 paper, it is the eighth closest known white dwarf to the Sun (after Sirius B , Procyon B , van Maanen's star , Gliese 440 , 40 Eridani B , Stein 2051 B and GJ 1221 ).[ 7] trigonometric parallax from the CTIOPI (Cerro Tololo Inter-American Observatory (CTIO) Parallax Investigation) 0.9 m telescope program, published in 2009, is 0.15613 ± 0.00084 arcsec ,[ 5] pc , or 20.89 ± 0.11 ly . Also, previous less precise parallax measurements of LP 658-2 present in YPC (Yale Parallax Catalog) and among results of CTIOPI 1.5 m telescope program:
LP 658-2 parallax measurements
Source Paper Parallax, mas Distance, pc Distance, ly Ref.
YPC van Altena et al., 1995 155.0 ± 2.1 6.45 ± 0.09 21.04 ± 0.29 [ 8]
CTIOPI 1.5 m TSN-14 (Costa et al., 2005) 156.93 ± 2.67 6.37 ± 0.11 20.78 ± 0.35 [ 9]
CTIOPI 0.9 m TSN-21 (Subasavage et al., 2009) 156.13 ± 0.84 6.40 ± 0.03 20.89 ± 0.11 [ 5]
Notes
↑ From surface gravity and mass. 1 2 White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star) References
↑ Roman, Nancy G. (1987). "Identification of a constellation from a position" . Publications of the Astronomical Society of the Pacific 99 (617): 695. Bibcode :1987PASP...99..695R . doi :10.1086/132034 Constellation record for this object at VizieR .1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A& A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 .
Gaia DR3 record for this source at VizieR . 1 2 3 4 5 6 7 8 9 10 Holberg, J. B.; Sion, E. M.; Oswalt, T.; McCook, G. P.; Foran, S.; Subasavage, John P. (1 April 2008). "A new look at the local white dwarf population" . The Astronomical Journal . 135 (4): 1225– 1238. Bibcode :2008AJ....135.1225H . doi :10.1088/0004-6256/135/4/1225 1 2 3 4 "GJ 223.2" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2011-01-17 .1 2 3 4 5 6 7 8 9 Subasavage, John P.; Jao, Wei-Chun; Henry, Todd J.; Bergeron, P.; Dufour, P.; Ianna, Philip A.; Costa, Edgardo; Méndez, René A. (1 June 2009). "The solar neighborhood. XXI. Parallax results from the CTIOPI 0.9 m program: 20 new members of the 25 parsec white dwarf sample". The Astronomical Journal . 137 (6): 4547– 4560. arXiv :0902.0627 Bibcode :2009AJ....137.4547S . doi :10.1088/0004-6256/137/6/4547 . S2CID 14696597 . ↑ Sion, Edward M.; Holberg, J. B.; Oswalt, Terry D.; McCook, George P.; Wasatonic, Richard (1 December 2009). "The white dwarfs within 20 parsecs of the Sun: kinematics and statistics". The Astronomical Journal . 138 (6): 1681– 1689. arXiv :0910.1288 Bibcode :2009AJ....138.1681S . doi :10.1088/0004-6256/138/6/1681 . S2CID 119284418 . ↑ Table 1 in Sion et al. 2009 ↑ van Altena, W. F.; Lee, J. T.; Hoffleit, E. D. (1995). The General Catalogue of Trigonometric [Stellar] Parallaxes (4th ed.). New Haven, CT: Yale University Observatory. Bibcode :1995gcts.book.....V . VizieR entry .↑ Costa, Edgardo; Méndez, René A.; Jao, W.-C.; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Ianna, Philip A.; Bartlett, Jennifer (July 2005). "The solar neighborhood. XIV. Parallaxes from the Cerro Tololo Inter-American Observatory Parallax Investigation—First results from the 1.5 m telescope program" . The Astronomical Journal . 130 (1): 337– 349. Bibcode :2005AJ....130..337C . doi :10.1086/430473 hdl :10533/176842
