BD +4°123
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| BD +4°123 | |
| Stellar characteristics | |
|---|---|
| Constellation | Pisces |
| Right ascension (Epoch J2000) | 0h 48m 23.0s |
| Declination (Epoch J2000) | +5° 16' 50.2" |
| Spectral type | K1-2 Ve |
| Distance from Sol | 24.3 ly |
| Other designations | HR 222, Gl 33, Hip 3765, HD 4628, SAO 109471, FK5 1019, LHS 121, LTT 10285, LFT 73, Hei 202, Wolf 25. |
BD+04 123 is located about 24.3 light-years away from our Sun, Sol, in the central part of the constellation Pisces, the Fish. The star may be visible to many Humans without a telescope.
The star's designation of BD+04 123 comes from a catalogue that was originally published in 1863 by Friedrich Wilhelm August Argelander (1799-1875) on the position and brightness of 324,198 stars between +90° and -2° declination that were measured over 11 years from Bonn, Germany with his assistants Eduard Schönfeld (1828-1891) and Aldalbert Krüger (1832-1896). The catalogue became famous as the Bonner Durchmusterung ("Bonn Survey") and is typically abbreviated as BD. It was later expanded and extended during the early 20th Century with the Cordoba [1] then the Cape Photographic Durchmusterung [2].
BD+04 123 is a main-sequence orange-red dwarf star of spectral and luminosity type K1-2 Ve. It may have around 83 percent of Sol's mass, 80 percent of its diameter[3], and 24 percent of its luminosity. It appears to be only 51 percent as enriched as Sol in elements heavier than hydrogen ("metals") based on its abundance of iron[4].
The distance from BD+04 123 where an Earth-type planet would be "comfortable" with liquid water is centered around only 0.49 AU -- between the orbital distances of Mercury and Venus in the Solar System -- where a planet probably would have an orbital period around 137 days or more than a third of an Earth year.
(Data from SolStation.com)
Notes
- ↑ (observed from Argentina)
- ↑ (observed from South Africa)
- ↑ (Johnson and Wright, 1983, page 647)
- ↑ (Cayrel de Strobel et al, 1991, page 277)
