BD +29°3872
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BD +29°3872 A | |
Stellar characteristics | |
---|---|
Constellation | Cygnus |
Right ascension (Epoch J2000) | 20h 03m 37.40s |
Declination (Epoch J2000) | +29° 53' 48.50" |
Spectral type | G6-8 V-IV+ |
Distance from Sol | 51.8 ly |
Other designations | HR 7670, Gl 777 A, HIP 98767, BD +29°3872, HD 190360, SAO 88133, LHS 3510, LTT 15867, LFT 1515, Wo or GJ 9683. |
Planets | BD +29°3872 A b<br\> BD +29°3872 A c<br\> |
BD +29°3872 Ba | |
Stellar characteristics | |
---|---|
Constellation | Cygnus |
Right ascension (Epoch J2000) | 20h 03m 37.40s |
Declination (Epoch J2000) | +29° 53' 48.50" |
Spectral type | M4.5-6 V |
Distance from Sol | 56 ly |
Other designations | Gl 777 B, BD+29°3872 B, LHS 3509, LTT 15865, LFT 1514, G 125-055, G 186-9. |
BD +29°3872 Bb | |
Stellar characteristics | |
---|---|
Constellation | Cygnus |
Right ascension (Epoch J2000) | 20h 03m 37.40s |
Declination (Epoch J2000) | +29° 53' 48.50" |
Spectral type | M4.5-6 V |
Distance from Sol | 56 ly |
BD +29°3872 is located about 51.8 light-years from Sol, while NASA's NStar Database suggests that Star B may lie as far as 56 ly away. It lies at the southern edge of the constellation Cygnus, the Swan.
Contents
BD +29°3872 A
BD +29°3872 A is a yellow-orange dwarf star of spectral and luminosity type G6-8 V-IV+. The star has about 96 percent of Sol's mass[1], around 1.3 to 1.74 times its diameter[2], and 1.13 times of its visual luminosity Geneva data). The star may be 1.78 times as enriched than Sol with elements heavier than hydrogen ("metallicity"), based on its abundance of iron[1][3]. With a high velocity and relatively high age[3], BD +29°3872 A appears to be unusually bright and large for its spectral type and may be evolving off the main sequence as a subgiant star.
The orbit of an Earth-like planet (with liquid water) around BD +29°3872 A may be centered around 1.1 AU -- between the orbital distances of Earth and Mars in the Solar System -- with an orbital period around 430 days (1.2 years).
Known places around BD +29°3872 A
As of 2005 two planets have been detected around BD +29°3872 A
- BD +29°3872 A b A Jupiter-class planet, it has 1.50 +/- 0.13 times Jupiter's mass. It orbits its primary at an average distance of 3.9 +/- 0.2 AUs but with an highly eccentric orbit (e=0.36 +/- 0.03) that takes around 7.9 years to complete[4][5].
- BD +29°3872 A c A Neptune sized planet in a highly circular, inner "torch" orbit that is completed in only 17.1 days (e=0.01 +/- 0.1). Planet "c" has around 18.1 +/- 4.8 Earth-masses and orbits Star A at an average distance of only 0.128 +/- 0.002 AUs.
BD +29°3872 Ba
BD +29°3872 Ba is a very dim red dwarf star of spectral and luminosity type M4.5-6 V. The star has about percent of Sol's mass, 19 percent of its diameter[2], and 4/10,000th of its visual luminosity. According to the ARICNS entry for Star B, it appears to have a faint companion star Bb that is separated by about 69.9 AUs[6].
BD +29°3872 Bb
BD +29°3872 Bb may be a very dim red dwarf star of spectral and luminosity type M4.5-6 V. The star is less massive than Sol and smaller than its diameter, as well as much dimmer.
(Data from SolStation.com)
Notes
- ↑ 1.0 1.1 (Santos et al, 2003)
- ↑ 2.0 2.1 (Johnson and Wright, 1983, page 695)
- ↑ 3.0 3.1 (J.B. Hearnshaw, 1974)
- ↑ (Vogt et al, 2005)
- ↑ (Extrasolar Planets Encyclopaedia)
- ↑ (Wulff Dietz Heintz, 1996; AJ96, 1072-88)