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).Table 1 in 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 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 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 its temperature being comparable to that of a K-type main sequence star.
Notes
References VizieR entry.