36 Ophiuichi
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| 36 Ophiuchi A | |
| Stellar characteristics | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension (Epoch J2000) | 17h 15m 20.98s |
| Declination (Epoch J2000) | -26° 36' 10.19" |
| Spectral type | K0-1 Ve |
| Distance from Sol | 19.5 ly |
| Other designations | 36 Oph, HR 6402, Gl 663 A, Hip 84405, HD 155886, CD-26 12026, CP(D)-26 5858, SAO 185198, LHS 437, ADS 10417 A. |
| 36 Ophiuchi B | |
| Stellar characteristics | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension (Epoch J2000) | 17h 15m 20.98s |
| Declination (Epoch J2000) | -26° 36' 10.19" |
| Spectral type | K1-5 Ve |
| Distance from Sol | 19.5 ly |
| Other designations | HR 6401, Gl 663 B, HD 155885, SAO 185199, LHS 438, ADS 10417 B. |
| 36 Ophiuchi C | |
| Stellar characteristics | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension (Epoch J2000) | 17h 15m 20.98s |
| Declination (Epoch J2000) | -26° 36' 10.19" |
| Spectral type | K5-6 Ve |
| Distance from Sol | 19.5 ly |
| Other designations | Gl 663 C, Gl 664, Hip 84478, HD 156026, CD-26 12036, CP(D)-26 5863, SAO 185213, LHS 439. |
36 Ophiuchi is a multiple star system located about 19.5 light-years away in the southernmost part of the Constellation Ophiuchus, the Serpent Holder or Snake Charmer -- south of Theta Ophiuchi. The system appears to be composed of three stars, of which Star C orbits the much closer binary pair of Stars AB.
36 Ophiuchi A
A main sequence orange-red dwarf (K0-1 Ve), the primary has only around 85 percent of Sol's mass[1], 81 percent of its diameter[2], 28 percent of its luminosity, and 50 to 98 percent of Sol's abundance of elements heavier than hydrogen (metallicity), based on its abundance of iron[3]. The orbital distance where an Earth-type planet would have liquid water is centered around 0.54 AU -- just beyond Mercury's orbital distance in the Solar System -- where a planet's period would be about 167 days or over one third of an Earth year. Based on an average parallax (0.1675") incorporating Hipparcos data, stars A and B are separated "on average" by about 88 AUs (of a semi-major axis) in a highly eccentric orbit (e= 0.922) that swings between seven and 169 AUs and takes around 570 years to complete[4].
36 Ophiuchi B
A main sequence orange-red dwarf (K1-5 Ve), star B has only about 85 percent of Sol's mass[1], 81 percent of its diameter[2], 27 percent of its luminosity, and 1.2 to 2.5 times Sol's abundance of elements heavier than hydrogen (metallicity), based on its abundance of iron[3]. The orbital distance where an Earth-type planet would have liquid water is centered around 0.53 AU -- just beyond the orbital distance of Mercury in the Solar System -- where the orbital period would be almost 163 days, or over a third of an Earth year.
36 Ophiuchi C
A main sequence orange-red dwarf (K5-6 Ve), star C has only about 71 percent of Sol's mass[1], 72 percent of its diameter[2], 8.7 percent percent of its luminosity, and 46 to 100 percent of Sol's abundance of elements heavier than hydrogen (metallicity), based on its abundance of iron[3]. It orbits the AB pair from around 4,370 to 5,390 AUs away and is a variable star. The orbital distance where an Earth-type planet would have liquid water is centered around 0.30 AU -- three-fourths of Mercury's orbital distance of in the Solar System -- where the orbital period would be over 76 days.
(Information from SolStation.com)
Notes
- ↑ 1.0 1.1 1.2 (RECONS estimate)
- ↑ 2.0 2.1 2.2 (Johnson and Wright, 1983, page 689)
- ↑ 3.0 3.1 3.2 (Cayrel de Strobel et al, 1991, page 301)
- ↑ (Irwin et al, 1996 -- "Orbit 4") and (Peter Brosche, 1960)
