van Maanen 2
White dwarf / From Wikipedia, the free encyclopedia
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.[11] 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.[12][13] Discovered in 1917 by Dutch–American astronomer Adriaan van Maanen,[14] Van Maanen 2 was the third white dwarf identified, after 40 Eridani B and Sirius B, and the first solitary example.[15]
Quick Facts Constellation, Pronunciation ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
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Constellation | Pisces |
Pronunciation | /vænˈmʌnənz/)[1] |
Right ascension | 00h 49m 09.89841s[2] |
Declination | +05° 23′ 18.9931″[2] |
Apparent magnitude (V) | 12.374[3] |
Characteristics | |
Spectral type | DZ8[4] |
U−B color index | 0.064[3] |
B−V color index | 0.546[3] |
V−R color index | 0.268[3] |
R−I color index | 0.4[5] |
Astrometry | |
Radial velocity (Rv) | −12±7[6] km/s |
Proper motion (μ) | RA: +1,231.325[2] mas/yr Dec.: −2711.830[2] mas/yr |
Parallax (π) | 231.7800 ± 0.0183 mas[7] |
Distance | 14.072 ± 0.001 ly (4.3144 ± 0.0003 pc) |
Absolute magnitude (MV) | 14.21±0.03[8] |
Details | |
Mass | 0.67±0.01[9] M☉ |
Radius | 0.01[10] R☉ |
Luminosity | 0.00016[9][8] L☉ |
Surface gravity (log g) | 8.16±0.01[9] cgs |
Temperature | 6,130±110[8] K |
Age | 3.45±0.36[lower-alpha 1][8] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Location of van Maanen's Star in the constellation Pisces |
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