BD -5°1844

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BD -5°1844 A
Stellar characteristics
ConstellationMonoceros
Right ascension (Epoch J2000)06h 52m 18.1s
Declination (Epoch J2000)-5° 10' 25.4"
Spectral typeK3 V
Distance from Sol28.4 ly
Other designationsGl 250 A, Hip 32984, HD 50281, SAO 133805, LHS 1875, LTT 2662, LFT 494, LPM 244.
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Places in Fenspace
BD -5°1844 B
Stellar characteristics
ConstellationMonoceros
Right ascension (Epoch J2000)06h 52m 18.0s
Declination (Epoch J2000)-5° 11' 24.0"
Spectral typeM2.5 V
Distance from Sol28.4 ly
Other designationsGl 250 B, HD 50281 B, BD-05 1844 B, LHS 1876, LTT 2663, LFT 495.
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This binary star system is located 28.4 light-years away from Sol. It lies in the east central part of the constellation Monoceros, the Unicorn. Many astronomers now refer to this star system as Gliese 250, its designation in the famous Gliese Catalogue of Nearby Stars[1] of Wilhelm Gliese (1915-93), who was a longtime astronomer at the Astronomiches Rechen-Institut at Heidelberg.

BD -5°1844 A

BD -5°1844 A is a main sequence, orange-red dwarf (K3 V) and may have 80 percent of Sol's mass, 78 percent of its diameter[2], and 14.6 percent of its luminosity. Star A's late spectral type and dim luminosity puts it possibly close to the lower limit of habitability for (multicellular) Earth-type plant and animal life, given the redness of its light and the increased risk of tidal locking from the closeness of the orbit necessary for liquid water on a planetary surface.

The distance from Star A where an Earth-type planet would be "comfortable" with liquid water is centered around 0.382 AU -- just within the orbital distance of Mercury in the Solar System. At that distance from the star, such a planet would have an orbital period of 96.2 days, or just over a quarter of an Earth year.

Past radial velocity analysis suggests that giant planets of one tenth to 10 times the mass of Jupiter do not exist within 0.1 to four AUs of Star A[3].

BD -5°1844 B

BD -5°1844 B is a a red dwarf of spectral and luminosity type M2.5 V. It has about 50 percent of Sol's mass, 49 percent of its diameter[2], and 58/10,000th of its brightness.

For Star B, the water zone orbit lies near 0.076 AU. A planet in the star's water zone would have a period of about 11 days. The possible tidal locking of such a closely orbiting planet would resulting in perpetual day on one side and perpetual night on the other.

(Data from SolStation)

Notes

  1. (CNS, now ARICNS database)
  2. 2.0 2.1 (Johnson and Wright, 1983)
  3. (Cummings et al, 1999)