 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] |
| Characteristics | |
| Spectral type | D [2] |
| Astrometry | |
| 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 | 632 [3] pc |
| Absolute magnitude (MV) | 8.14+0.60 −0.90 [2] |
| Details [2] | |
| Mass | 0.14 ± 0.01 M☉ |
| Radius | 0.078+0.040 −0.020 R☉ |
| Surface gravity (log g) | 5.80+0.20 −0.35 cgs |
| Temperature | 10100+250 −350 K |
| Rotational velocity (v sin i) | 30.5 ± 2.0 km/s |
| Other designations | |
| 2MASS J14063545+7418579 [3] | |
| Database references | |
| SIMBAD | data |
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". [3] The star was cataloged as a Giclas object with the designation "GD 492" being assigned by Henry Giclas in 1970. [7]
