Delta Ophiuchi
Star in the constellation Ophiuchus / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Delta Ophiuchi?
Summarize this article for a 10 year old
SHOW ALL QUESTIONS
Delta Ophiuchi (δ Ophiuchi, abbreviated Delta Oph, δ Oph), formally named Yed Prior /ˌjɛd ˈpraɪər/,[13][14] is a star in the constellation of Ophiuchus. It forms a naked-eye optical double with Epsilon Ophiuchi (named Yed Posterior[14]). The apparent visual magnitude is 2.75,[2] making this a third-magnitude star and the fourth-brightest in the constellation. Parallax measurements from the Hipparcos spacecraft yield a distance estimate of approximately 171 light-years (52 parsecs) from the Sun (Epsilon Ophiuchi is approximately 108 light-years (33 parsecs)).[1]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ophiuchus |
Right ascension | 16h 14m 20.73853s[1] |
Declination | –03° 41′ 39.5612″[1] |
Apparent magnitude (V) | 2.75[2] |
Characteristics | |
Evolutionary stage | AGB[3] |
Spectral type | M0.5 III[4] |
U−B color index | +1.96[2] |
B−V color index | +1.59[2] |
Variable type | Suspected[5] |
Astrometry | |
Radial velocity (Rv) | –19.9[6] km/s |
Proper motion (μ) | RA: –47.54[1] mas/yr Dec.: –142.73[1] mas/yr |
Parallax (π) | 19.06 ± 0.16 mas[1] |
Distance | 171 ± 1 ly (52.5 ± 0.4 pc) |
Absolute magnitude (MV) | –0.90[7] |
Details | |
Mass | 1.5[8] M☉ |
Radius | 59[9] R☉ |
Surface gravity (log g) | 1.4[10] cgs |
Temperature | 3,679[10] K |
Metallicity [Fe/H] | 0.32[10] dex |
Rotational velocity (v sin i) | 7.0[11] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Close