Van Maanen's star

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Star
Van Maanen's star
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation fishes
Right ascension 00 h 49 m 9.9 s
declination + 05 ° 23 ′ 19 ″
Apparent brightness 12.4 mag
Typing
B − V color index +0.55 
U − B color index +0.06 
R − I index +0.25 
Spectral class DZ7.5
Astrometry
Radial velocity (263) km / s
parallax (231.74 ± 0.04)  mas
distance (14.06 ± 0.01)  ly
(4.31 ± 0.01)  pc
Visual absolute brightness M vis 14.2 mag
Proper movement 
Rec. Share: (1231.33 ± 0.08)  mas / a
Dec. portion: (−2711.83 ± 0.04)  mas / a
Physical Properties
Dimensions (0.68 ± 0.02)  M ☉
radius (0.013 ± 0.002)  R ☉
Luminosity

(0.00017)  L ☉

Effective temperature (6200)  K
Age White dwarf stage: ~ 3.3 bill.  A
Other names
and catalog entries
Gliese catalog FY 35 [1]
Hipparcos catalog HIP 3829 [2]
Tycho catalog TYC 17-1272-1 [3]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J00490996 + 0523173 [4]
Other names LFT 76 • LHS 7 • LTT 10292 • Wolf 28 • WD 0046 + 051

Van Maanen's star (also Van Maanen 2 ) is a white dwarf in the constellation Pisces discovered in 1917 by Adriaan van Maanen . At a distance of about 14 light years, it is the third closest known white dwarf after Sirius B and Prokyon B and the closest that is not part of a multiple system. The possible existence of a substellar companion has been suggested several times but remains unconfirmed.

Web links

Individual evidence

  1. ↑ a b c d e f g h Wolf 28. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 18, 2018 .
  2. ↑ a b c d N. Giammichele, P. Bergeron, P. Dufour: Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs . In: The Astrophysical Journal Supplement . 199, No. 2, April 2012, p. 29. arxiv : 1202.5581 . bibcode : 2012ApJS..199 ... 29G . doi : 10.1088 / 0067-0049 / 199/2/29 .
  3. ^ Hipparcos, the New Reduction (van Leeuwen, 2007)