Van Maanen 2
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Pronunciation | /vænˈmʌnənz/) |
| Right ascension | 00h 49m 09.89834s |
| Declination | +05° 23′ 18.9938″ |
| Apparent magnitude (V) | 12.374 |
| Characteristics | |
| Spectral type | DZ8 |
| U−B color index | 0.064 |
| B−V color index | 0.546 |
| V−R color index | 0.268 |
| R−I color index | 0.4 |
| Astrometry | |
| Radial velocity (Rv) | −12±7 km/s |
| Proper motion (μ) | RA: +1,231.399 mas/yr Dec.: −2,711.883 mas/yr |
| Parallax (π) | 231.7800±0.0183 mas |
| Distance | 14.072 ± 0.001 ly (4.3144 ± 0.0003 pc) |
| Absolute magnitude (MV) | 14.21±0.03 |
| Details | |
| Mass | 0.67±0.02 M☉ |
| Radius | 0.01129 ± 0.00066 R☉ |
| Luminosity | 1.622+0.156 −0.143×10−4 L☉ |
| Surface gravity (log g) | 8.16±0.03 cgs |
| Temperature | 6,130±110 K |
| Age | 4.1±1.0, >3.45±0.36 Gyr |
| Other designations | |
| van Maanen's Star, van Maanen 2, vMa2, BD+18°2165, GJ 35, HIP 3829, G 001-027, LFT 76, LHS 7, LTT 10292, WD 0046+051, Wolf 28 | |
| Database references | |
| SIMBAD | data |
Location of van Maanen's Star in the constellation Pisces | |
Van Maanen 2, or van Maanen's Star, is the closest known solitary white dwarf to the Solar System. It is a dense, compact stellar remnant no longer generating energy and has equivalent to about 68% of the Sun's mass but only 1% of its radius. At a distance of 14.1 light-years it is the third closest of its type of star after Sirius B and Procyon B, in that order. Discovered in 1917 by Dutch–American astronomer Adriaan van Maanen, Van Maanen 2 was the third white dwarf identified, after 40 Eridani B and Sirius B, and the first solitary example.