LP 40-365

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LP 40-365
LP40 365.gif
Tangential movement of LP 40-365 between 1955 and 1995. The field of view is 8 × 8 arcminutes.
Credit: Digitized Sky Survey
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Minor
Right ascension  14h 06m 35.45s[1]
Declination +74° 18′ 58.0″[1]
Apparent magnitude (V) 15.51 ± 0.09[2]
Spectral type D[2]
Radial velocity (Rv)498[2] km/s
Total velocity~546[2] km/s
Proper motion (μ) RA: −56 ± 7[2] mas/yr
Dec.: 148 ± 7[2] mas/yr
Distance~300[2] pc
Absolute magnitude (MV)8.14+0.60
Mass0.14 ± 0.01 M
Surface gravity (log g)5.80+0.20
Rotational velocity (v sin i)30.5 ± 2.0 km/s
Other designations
2MASS J14063545+7418579[3]
Database references

LP 40-365 is a low-mass white dwarf star in the constellation Ursa Minor. It travels at high speed through the Milky Way and has a very unusual elemental composition, lacking hydrogen, helium or carbon. It may have been produced in a subluminous Type Iax supernova that failed to destroy its host star totally.[2] [4][5] The "LP" name is derived from the Luyten-Palomar proper motion catalogue in which it appeared in the 1960s.[6] Another catalog name for this star is "GD 492". [7] The star was cataloged as a Giclas object with the designation "GD 492" being assigned by Henry Giclas in 1970.[8]


  1. ^ a b Cutri, R. M.; et al. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
  2. ^ a b c d e f g h i j Vennes, Stephane; Nemeth, Peter; Kawka, Adela; Thorstensen, John R.; Khalack, Viktor; Ferrario, Lilia; Alper, Erek H. (18 August 2017). "An unusual white dwarf star may be a surviving remnant of a subluminous Type Ia supernova". Science. 357 (6352): 680–683. arXiv:1708.05568. Bibcode:2017Sci...357..680V. doi:10.1126/science.aam8378. PMID 28818942.
  3. ^ "GD 492". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 April 2018.
  4. ^ "Science Press Release". Astroserver.org. Retrieved 17 August 2017.
  5. ^ Javier Barbuzano (17 August 2017). "The White Dwarf That Survived". Sky & Telescope.
  6. ^ Luyten, W. J. (1963–1981). "Proper Motion Survey with the 48 inch Schmidt Telescope". University of Minnesota.
  7. ^ "GD 492". SIMBAD. Centre de données astronomiques de Strasbourg.
  8. ^ Giclas, Henry L.; Burnham, Robert; Thomas, Norman Gene (1970). "A list of white dwarf suspects III : Special objects of small proper motion from the Lowell survey". Bulletin of the Lowell Observatory. 7 (153): 183. Bibcode:1970LowOB...7..183G.

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