Van Maanen's star

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Van Maanen's star
Observation data
Epoch J2000
Constellation
(pronunciation)		 Pisces
Right ascension 00h 49m 09.9s
Declination +05° 23' 19"
Apparent magnitude (V) 12.4
Characteristics
Spectral type WDZ7
U-B color index 0.02[1]
B-V color index 0.56[1]
Variable type None
Astrometry
Radial velocity (Rv) +6±15[1] km/s
Proper motion (μ) RA: 1233.05 mas/yr
Dec.: -2710.56 mas/yr
Parallax (π) 231.88 ± 1.79 mas
Distance 14.1 ± 0.1 ly
(4.31 ± 0.03 pc)
Absolute magnitude (MV) 14.2
Details
Mass 0.7 M☉
Radius 0.005 R☉
Surface gravity (log g) ?
Luminosity 0.0001 L☉
Temperature ? K
Metallicity ?
Rotation ?
Age ? years
Other designations
van Maanen 2, G 001-027, GJ 35, GCTP 160.00, LHS 7, HIP 3829, WD 0046+051
Data sources:
NStars
Database references
SIMBAD data

Van Maanen's star is a white dwarf star. Out of the white dwarfs known, it is the third closest to the Sun; the closest is Sirius B and the second closest is Procyon B.[2] It is also the closest solitary white dwarf to the Sun known.[2] It is located 14.1 light years from the Sun in the constellation Pisces, and has a relatively high proper motion of 2.98" annually. It is far too faint to be seen with the naked eye. Its mass has been estimated to be about 70% of the Sun's, and its diameter has been estimated to be about 1% of the Sun's.[1] It is under 2/10,000 times as luminous as the Sun.[3]

Van Maanen's star was discovered in 1917 by Adriaan van Maanen.[4] It was the third white dwarf discovered, after 40 Eridani B and Sirius B.[5], p. 2

[edit] See also

[edit] References

  1. ^ a b c d Astrometric determination of the gravitational redshift of van Maanen 2 (EG 5), George Gatewood and Jane Russell, Astronomical Journal 79, #7 (July 1974), pp. 815–818.
  2. ^ a b The One Hundred Nearest Star Systems, RECONS, April 11, 2007; accessed online May 7, 2007.
  3. ^ Van Maanen's Star, solstation.com, accessed on line May 7, 2007.
  4. ^ Two Faint Stars with Large Proper Motion, A. van Maanen, Publications of the Astronomical Society of the Pacific 29 (#172), December 1917, pp. 258–259.
  5. ^ White Dwarfs, E. Schatzman, Amsterdam: North-Holland, 1958.
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