69 Orionis
06h12m 03.27955s[1]
16° 07′ 49.4614″[1]
4.92[2]
Characteristics
main sequence
B5Vn[3]
U−B color index
−0.59[2]
B−V color index
−0.12[2]
Radial velocity (Rv)
+22.00[4] km/s
Proper motion (μ)
RA: +5.49[1] mas/yr
Dec.: −16.80[1] mas/yr
Parallax (π)
Absolute magnitude (MV)
−1.09[5]
Details[6]
6.4±0.2 M☉
1,442+248
−212 L☉
Surface gravity (log g)
4.05±0.17 cgs
17,090 K
Metallicity [Fe/H]
Rotational velocity (v sin i)
285±23 km/s
Database references
69 Orionis is a single[11] star in the equatorial constellationofOrion, positioned a couple of degrees to the north of Xi Orionis. It has the Bayer designation f1 Orionis; 69 Orionis is the Flamsteed designation. The star is visible to the naked eye as faint, blue-white hued point of light with an apparent visual magnitude of 4.92.[2] It is located approximately 530 light-years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +22 km/s.[4] In 2015, H. Bouy and J. Alves suggested that it is a member of the newly discovered Taurion OB association.[9]
This object is a B-type main-sequence star with a stellar classification of B5Vn,[3] where the 'n' suffix indicates "nebulous" (broad) lines due to rapid rotation. It has a projected rotational velocity of 285 km/s, compared to a critical velocityof476±37 km/s; the polar axis is inclinedby64°±16°.[6] This is a known Be star[12] that began behaving as a normal star in November, 1982.[13] It has 6.4 times the mass of the Sun and is radiating around 1,442 times the Sun's luminosity from its photosphere at an effective temperatureof17,090 K.[6]
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