Star profile
37 Ophiuchi
Cool red starWhat is 37 Ophiuchi
37 Ophiuchi is an M-type red giant more than a thousand light-years away, meaning its intrinsic brightness must be enormous to remain visible to the naked eye from such a distance. It hangs in vast Ophiuchus, the serpent-bearer that embraces the celestial equator and through which the Sun passes each November. Its light has been travelling since before the first European cathedrals were built.
Where it is and when to see it
37 Ophiuchi lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is June, when it culminates around midnight.
- From London it culminates about 49° above the horizon.
- From New York it culminates about 60° above the horizon.
- From Sydney it culminates about 46° above the horizon.
It can be seen from anywhere north of 79° S.
It ranks no. 49 in brightness among the 88 stars of Ophiuchus in our catalogue. To find it, start from Rasalhague, the brightest: it lies about 6° away (a fist at arm's length covers about 10°).
The light you see today left it about 1,100 years ago.
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Astronomical data for 37 Ophiuchi
- Constellation
- Ophiuchus
- Apparent magnitude
- 5.32
- Distance
- 1091.0 light years
- Coordinates (J2000)
- RA 258.116° · Dec 10.585°
- Catalogue
- HIP 84177 · HD 155644
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Other stars in Ophiuchus
Ophiuchus has 88 stars in Stelvia's catalogue. Here are a few of them.
- RasalhagueAlpha Ophiuchi2.08
- SabikEta Ophiuchi2.43
- Zeta Ophiuchi2.54
- HIP 806205.24
- 43 Ophiuchi5.30
- HIP 856675.31
- HIP 912175.38
- HIP 806935.41