36 Ophiuichi

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This page is a Wikipedia or SolStation data dump with little or no relation – or, worse yet, possibly with contradictions – to the situation in Fenspace.

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Places in Fenspace
36 Ophiuchi A
Stellar characteristics
ConstellationOphiuchus
Right ascension (Epoch J2000)17h 15m 20.98s
Declination (Epoch J2000)-26° 36' 10.19"
Spectral typeK0-1 Ve
Distance from Sol19.5 ly
Other designations36 Oph, HR 6402, Gl 663 A, Hip 84405, HD 155886, CD-26 12026, CP(D)-26 5858, SAO 185198, LHS 437, ADS 10417 A.
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Places in Fenspace
36 Ophiuchi B
Stellar characteristics
ConstellationOphiuchus
Right ascension (Epoch J2000)17h 15m 20.98s
Declination (Epoch J2000)-26° 36' 10.19"
Spectral typeK1-5 Ve
Distance from Sol19.5 ly
Other designationsHR 6401, Gl 663 B, HD 155885, SAO 185199, LHS 438, ADS 10417 B.
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Places in Fenspace
36 Ophiuchi C
Stellar characteristics
ConstellationOphiuchus
Right ascension (Epoch J2000)17h 15m 20.98s
Declination (Epoch J2000)-26° 36' 10.19"
Spectral typeK5-6 Ve
Distance from Sol19.5 ly
Other designationsGl 663 C, Gl 664, Hip 84478, HD 156026, CD-26 12036, CP(D)-26 5863, SAO 185213, LHS 439.
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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. 1.0 1.1 1.2 (RECONS estimate)
  2. 2.0 2.1 2.2 (Johnson and Wright, 1983, page 689)
  3. 3.0 3.1 3.2 (Cayrel de Strobel et al, 1991, page 301)
  4. (Irwin et al, 1996 -- "Orbit 4") and (Peter Brosche, 1960)