LP 658-2

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title: "LP 658-2" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["orion-(constellation)", "white-dwarfs", "gliese-and-gj-objects"] description: "White dwarf star in the constellation Orion" topic_path: "general/orion-constellation" source: "https://en.wikipedia.org/wiki/LP_658-2" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary White dwarf star in the constellation Orion ::

| name = LP 658-2 | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Orion | ra = | dec = | appmag_v=14.488 | class = DZ11.8 | appmag_1_passband=B | appmag_1=15.49 | appmag_2_passband=V | appmag_2=14.488 | appmag_3_passband=RKC | appmag_3=13.99 | appmag_4_passband=IKC | appmag_4=13.51 | appmag_5_passband=J | appmag_5=13.05 ± 0.03 | appmag_6_passband=H | appmag_6=12.86 ± 0.03 | appmag_7_passband=KS | appmag_7=12.78 ± 0.03 | b-v = 1.0 | prop_mo_ra = | prop_mo_dec = | pm_footnote = | parallax = 155.2373 | p_error = 0.0175 | parallax_footnote = | absmag_v=15.44 ± 0.03 | component1=From Holberg etal. (2008) | source= | mass= | gravity= | radius=0.014From surface gravity and mass. | temperature=, | age_gyr=6.42 | component1 = From Subasavage etal. (2009) | source= | mass= | gravity= | radius=0.010 | temperature= | age_gyr=White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star) | names= | Simbad=GJ+223.2

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

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). 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, 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 ::data[format=table]

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
CTIOPI 1.5 m	TSN-14 (Costa et al., 2005)	156.93 ± 2.67	6.37 ± 0.11	20.78 ± 0.35	last1=Costa
CTIOPI 0.9 m	TSN-21 (Subasavage et al., 2009)	156.13 ± 0.84	6.40 ± 0.03	20.89 ± 0.11
::

Physical parameters

There are two sets of published physical parameters of LP 658-2, significantly differing from each other: one from and , the other from .

Color

Despite it being classified as a "white" dwarf, it appears yellowish white rather than white, due to temperature, cooler than the Sun's and comparable with that of a K-type main sequence star.

Notes

References

References

1. {{cite constellation. LP 658-2
2. (1 April 2008). "A new look at the local white dwarf population". The Astronomical Journal.
3. (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.
4. (1 December 2009). "The white dwarfs within 20 parsecs of the Sun: kinematics and statistics". The Astronomical Journal.
5. Table 1 in {{harvnb. Sion. Holberg. Oswalt. McCook. 2009
6. (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.
7. {{Cite Gaia DR3. 3022956969731332096
8. "GJ 223.2".
9. (1995). "The General Catalogue of Trigonometric [Stellar] Parallaxes". Yale University Observatory.

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