BD +41°328
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| BD +41°328 A | |
| Stellar characteristics | |
|---|---|
| Constellation | Andromeda |
| Right ascension (Epoch J2000) | 01h 41m 47.10s |
| Declination (Epoch J2000) | +42° 36' 48.1" |
| Spectral type | G1.5 V |
| Distance from Sol | 41.2 ± 0.4 ly |
| Other designations | HR 483, Gl 67, Hip 7918, HD 10307, BD +41°328, SAO 37434, LHS 1284, LTT 10590, LFT 150, PGC 372. |
| BD +41°328 B | |
| Stellar characteristics | |
|---|---|
| Constellation | Andromeda |
| Right ascension (Epoch J2000) | 01h 41m 47.10s |
| Declination (Epoch J2000) | +42° 36' 48.1" |
| Spectral type | M V |
| Distance from Sol | 41.2 ± 0.4 ly |
The BD +41°328 binary system is located about 41.2 light-years (ly) from Sol. It lies at the northeastern part of the constellation Andromeda, the Chained Maiden. BD +41°328 A is the 30th closest Sol- or G-type star to the Sun itself. Its red dwarf companion B was first detected through astrometric perturbations of Star A's motion in 1976 by Sarah Lee Lippincott and J.J. Lanning.
According to the Sixth Catalog of Orbits of Visual Binaries, Stars A and B move around each other at an average distance of 7.33 AUs (semi-major axis a= 0.58") in a very eccentric (e= 0.43) orbit that takes 19.5 years to complete. The two stars would get as close as 4.2 AUs and as far away from each other as 10.5 AUs. Their orbits around each other is inclined by 103° with respect to an observer on Earth[1][2][3][4].
BD +41°328 A
BD +41°328 A is a yellow-orange main sequence dwarf star of spectral and luminosity type G1.5 V. A little bigger and brighter than Sol, the star may have 97 +/- 23 percent of Sol's mass[2], the same diameter[5], and close to 1.4 times its luminosity. It may be 96 percent as enriched as Sol with elements heavier than hydrogen ("metallicity"), based on its abundance of iron[6]. Based on isochrone fitting, the star may be older than Sol at around 5.9 billion years of age[7][6]
An Earth-type planet could have liquid water in a stable orbit centered around 1.18 AU from Star A -- between the orbital distances of Earth and Mars in the Solar System. Such a planet would have an orbital period of around 1.3 Earth years. Unfortunately, current estimates of the masses and orbits of Stars A and B -- whose large margins of errors result in significant uncertainty -- suggest that the orbit of a planet in the habitable zone of Star A could be disrupted.
BD +41°328 B
BD +41°328 B is an "intermediate mass," red main sequence dwarf star of spectral and luminosity type M V[2]. Much smaller and dimmer than Sol, the star may have 29 +/- 7 percent of Sol's mass [2], a smaller diameter, and only 0.13 percent of its luminosity. An Earth-type planet could have liquid water in a stable orbit centered around 0.036 AU from Star B -- well within the orbital distance of Mercury in the Solar System. Such a planet would have an orbital period of less than five days and would be tidally locked with respect to Star B.
(Data from SolStation.com)
Notes
- ↑ (Staffan Söderhjelm, 1999)
- ↑ 2.0 2.1 2.2 2.3 (Henry et al, 1992)
- ↑ (Lippincott et al, 1983)
- ↑ (Lippincott and Manning, 1976)
- ↑ (Johnson and Wright, 1983, page 649)
- ↑ 6.0 6.1 (Ibukiyama and Arimoto, 2002)
- ↑ (Margaret C. Turnbull, 2004)
