BD +4°123

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BD +4°123
Stellar characteristics
Right ascension (Epoch J2000)0h 48m 23.0s
Declination (Epoch J2000)+5° 16' 50.2"
Spectral typeK1-2 Ve
Distance from Sol24.3 ly
Other designationsHR 222, Gl 33, Hip 3765, HD 4628, SAO 109471, FK5 1019, LHS 121, LTT 10285, LFT 73, Hei 202, Wolf 25.
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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


  1. (observed from Argentina)
  2. (observed from South Africa)
  3. (Johnson and Wright, 1983, page 647)
  4. (Cayrel de Strobel et al, 1991, page 277)