Teegarden's Star

Proper names: SO25300.5+165258, SO025300.5+165258, Teegarden's Star
Catalog numbers:
     SO 0253+1652, SO 25300.5+165258, SO 025300.5+165258, Two Micron All Sky Survey (2MASS) J02530084+1652532
Arity: singular
Points of interest:
     Preliminary trigonometric parallax measurements for this star indicated that it was only some 7.8 light-years away, which would have made this star 300,000 times dimmer than the sun — the most intrinsically dim red dwarf ever discovered (beating out Wolf 359 by a factor of 6 in dimness). Later observations refined this distance upwards to 12.4 light-years, however, meaning that this star isn't as dim as originally thought.
     The RECONS article on this star indicates that the distance to this object is still up for debate. The strengths of the star's spectral bands of Calcium Hydride (CaH₂) and Titanium Oxide (TiO₅) indicate that it's probably not metal-poor, so this star is probably Luminosity Class V, not Luminosity Class VI.

Right Ascension and Declination: 2h53m0.5s, +16°52'58" (epoch 2003.0)
Distance from Sol: 12.4 light-years (3.80178 parsecs)
Celestial (X,Y,Z) coordinates in ly: 8.64224, 8.1304, 3.60114
Galactic (X,Y,Z) coordinates in ly: -9.41731, 3.27715, -7.37253
Proper motion: 5 arcsec/yr

What do all these fields mean?

Spectral class: M6.5
Luminosity Class: V
Apparent visual magnitude: +15.40
Absolute visual magnitude: +17.50
Visual luminosity: 0.000009 x Sol
Mass: 0.07 x Sol
Diameter: 0.15 x Sol
Comfort Zone (visual): 0.002950 A.U.s
Orbital period in CZ: 5.30941 hours
Tidal index in CZ: 2.72591e+006
Angular size of star in sky in CZ: 27.104818 degrees

Data for this star system were most recently updated on 18-March-2004.