Van Maanen 2

Van Maanen 2

Van Maanen's star (bright star in the middle)
Credit: SDSS
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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]
Distance14.072 ± 0.001 ly
(4.3144 ± 0.0003 pc)
Absolute magnitude (MV)14.21±0.03[8]
Details[8]
Mass0.67±0.02 M☉
Radius0.01129 ± 0.00066[a] R☉
Luminosity1.622+0.156
−0.143×10−4 L☉
Surface gravity (log g)8.16±0.03 cgs
Temperature6,130±110 K
Age3.45±0.36[b] 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[5]
Database references
SIMBADdata
van Maanen's Star is located in the constellation Pisces.
van Maanen's Star is located in the constellation Pisces.
van Maanen's Star
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.[9] 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.[10][11] Discovered in 1917 by Dutch–American astronomer Adriaan van Maanen,[12] Van Maanen 2 was the third white dwarf identified, after 40 Eridani B and Sirius B, and the first solitary example.[13]

  1. ^ Cite error: The named reference Dickinson2012 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference mnras403_4_1949 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference vizierIII_235B was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference simbad was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Lindegren_Dravins_2021 was invoked but never defined (see the help page).
  7. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  8. ^ a b Cite error: The named reference Subasavage_et_al_2017 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference ApJS199_2_29 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference recons was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference apj571 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference van_maanen was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference schatzman was invoked but never defined (see the help page).


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