Edge Rewrite
restyle Source code View original
// HTMLRewriter · presentation

This page was redesigned at the edge.

Cloudflare fetched the original article and streamed it through HTMLRewriter to apply an entirely new visual system without rebuilding the source page.

Jump to content

LP 658-2

Coordinates: Sky map 05h 55m 09.53s, −04° 10′ 07.1″
From Wikipedia, the free encyclopedia
LP 658-2
Observation data
Epoch 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: 535.249 mas/yr[2]
Dec.: −2,317.011 mas/yr[2]
Parallax (π)155.2373±0.0175 mas[2]
Distance21.010 ± 0.002 ly
(6.4418 ± 0.0007 pc)
Absolute magnitude (MV)15.44 ± 0.03[5]
Details[3]
From Holberg etal. (2008)
Mass0.45±0.01 M☉
Radius0.014[3][note 1] R☉
Surface gravity (log g)7.80±0.02[3] cgs
Temperature4,270±70,[3] K
Age6.42[6][note 2] Gyr
Details[5]
From Subasavage etal. (2009)
Mass0.80±0.01 M☉
Radius0.010 R☉
Surface gravity (log g)8.35±0.01 cgs
Temperature5,180±70 K
Age6.82±0.02[note 2] Gyr
Other designations
HL 4, GJ 223.2, GJ 9193, EGGR 45, G 99-44, G 106-12, LHS 32, LP 658-2, NLTT 15811, WD 0552-041[4]
Database references
SIMBADdata

LP 658-2 is a degenerate (white dwarf) star in the constellation of Orion,[4] the single known object in its system. It has an apparent visual magnitude of approximately 14.488.[3]

Distance

[edit]

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] Its 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] corresponding to a distance 6.40 ± 0.03 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

SourcePaperParallax, masDistance, pcDistance, lyRef.
YPCvan Altena et al., 1995155.0 ± 2.16.45 ± 0.0921.04 ± 0.29[8]
CTIOPI 1.5 mTSN-14 (Costa et al., 2005)156.93 ± 2.676.37 ± 0.1120.78 ± 0.35[9]
CTIOPI 0.9 mTSN-21 (Subasavage et al., 2009)156.13 ± 0.846.40 ± 0.0320.89 ± 0.11[5]

Physical parameters

[edit]

There are two sets of published physical parameters of LP 658–2, significantly differing from each other: one from Holberg et al. 2008 and Sion et al. 2009, the other from Subasavage et al. 2009.

Color

[edit]

Despite it being classified as a "white" dwarf, it appears yellowish white rather than white due to its temperature being comparable to that of a K-type main sequence star.

Notes

[edit]
  1. ↑ From surface gravity and mass.
  2. 1 2 White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star)

References

[edit]
  1. ↑ 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.
  2. 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.
  3. 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.
  4. 1 2 3 4 "GJ 223.2". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2011-01-17.
  5. 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.
  6. ↑ 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.
  7. ↑ Table 1 in Sion et al. 2009
  8. ↑ 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.
  9. ↑ 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.
Retrieved from "https://en.wikipedia.org/w/index.php?title=LP_658-2&oldid=1345128332"