Omicron Arietis

Short description: Star in the constellation Aries

Omicron Arietis  Observation data
Equinox J2000.0]] (ICRS)

Constellation | Aries
Right ascension |  02h 44m 32.97317s[1]
Declination | +15° 18′ 42.7085″[1]
Apparent magnitude (V) | +5.78[2]
Characteristics
Spectral type | B9 Vn[3]
U−B color index | −0.21[4]
B−V color index | −0.01[4]
Astrometry
Radial velocity (Rv)| −2.4±3.3[5] km/s
Proper motion (μ)|  RA: +3.25[1] mas/yr
Dec.: −14.87[1] mas/yr
Parallax (π)| 5.49 ± 0.32[1] mas
Distance| 590 ± 30 ly
(180 ± 10 pc)
Absolute magnitude (MV)| −0.51[6]
Details
Mass| 3.45±0.09[7] M☉
Radius| 3.1[8] R☉
Luminosity| 248[7] L☉
Temperature| 10,715[7] K
Rotational velocity (v sin i)| 225[9] km/s
Age| 286[10] Myr
Other designations

ο Ari, 37 Arietis, BD+14° 457, HD 17036, HIP 12803, HR 809, SAO 93082[11]

Database references
SIMBAD| data

Omicron Arietis, Latinised from ο Arietis, is the Bayer designation for a single,[2] blue-white-hued star in the northern constellation of Aries. It has an apparent visual magnitude of +5.78,[2] which means it is dimly visible to the naked eye. Based upon an annual parallax shift of 5.49 mas as seen from Earth,[1] it is located roughly 590 light-years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.22 due to interstellar dust.[10]

This is a B-type main-sequence star with a stellar classification of B9 Vn.[3] The 'n' suffix indicates that it has nebulous absorption lines in its spectrum, which are caused by the Doppler effect and rapid rotation. Indeed, it has a projected rotational velocity of 225 km/s.[9] The star has an estimated 3.45[7] times the mass of the Sun and about 3.1[8] times the Sun's radius. It is radiating energy from its photosphere at 248 times the Sun's luminosity with an effective temperature of 10,715 K.[7]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
2. ↑ 2.0 2.1 2.2 Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
3. ↑ 3.0 3.1 Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal 77: 750–755, doi:10.1086/111348, Bibcode: 1972AJ.....77..750C.
4. ↑ 4.0 4.1 Crawford, D. L. (February 1963), "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars", Astrophysical Journal 137: 530, doi:10.1086/147526, Bibcode: 1963ApJ...137..530C.
5. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
6. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
7. ↑ 7.0 7.1 7.2 7.3 7.4 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
8. ↑ 8.0 8.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 5211–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
9. ↑ 9.0 9.1 Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R.
10. ↑ 10.0 10.1 Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G.
11. ↑ "omi Ari". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=omi+Ari.

## External links

* HR 809
* Image Omicron Arietis

* v
* t
* e

Constellation of Aries

* List of stars in Aries
* Aries in Chinese astronomy

Stars|

| Bayer|

* α (Hamal)
* β (Sheratan)
* γ (Mesarthim)
* δ (Botein)
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ
* ν
* ξ
* ο
* π
* ρ1
* ρ2
* ρ3
* σ
* τ1
* τ2

|

Flamsteed|

* 1
* 4
* 7
* 10
* 11
* 14
* 15
* 16
* 19
* 20
* 21
* 23
* 26
* 27
* 29
* 30
* 31
* 33
* 35
* 36
* 38
* 39 (Lilii Borea)
* 40
* 41 (Bharani)
* 47
* 49
* 50
* 51
* 52
* 53
* 54
* 55
* 56
* 59
* 60
* 62
* 64
* 65
* 66
* 54 Cet
* 85 Cet

Variable|

* R
* X
* RV
* RW
* RX
* SS
* TT
* UX
* VW
* VY
* VZ (16 Tri)
* WX
* XY

HR|

* 577
* 578
* 601
* 609
* 624
* 644
* 676
* 711
* 723
* 728
* 803
* 856
* 902
* 916
* 924
* 931
* 945
* 946
* 948
* 952
* 971
* 999

HD|

* 12661
* 19445
* 19549
* 20367

Other|

* BD+20°307
* HAT-P-25
* HIP 14810
* L 1159-16
* L1448 IRS 3
* L1455 FIR
* LkHα 264
* PSR B0301+19
* Teegarden's Star
* WASP-11
* WD 0145+234

| Exoplanets|

* 30 Arietis Bb
* BD+20 594b
* HD 12661 b
* c
* HD 20367 b
* HIP 14810 b
* c
* d
* Teegarden b
* Teegarden c

|

| Nebulae|

* L1448
* L1455
* MBM 12

|

Galaxies|

| NGC|

* 671
* 673
* 675
* 677
* 678
* 680
* 683
* 691
* 694
* 695
* 697
* 711
* 716
* 719
* 722
* 765
* 770
* 772
* 774
* 776
* 781
* 786
* 792
* 794
* 803
* 810
* 817
* 820
* 821
* 870
* 871
* 876
* 877
* 882
* 900
* 901
* 903
* 904
* 915
* 916
* 918
* 919
* 924
* 927
* 928
* 932
* 935
* 938
* 962
* 972
* 976
* 984
* 990
* 992
* 1012
* 1024
* 1028
* 1029
* 1030
* 1036
* 1054
* 1056
* 1088
* 1109
* 1111
* 1112
* 1115
* 1116
* 1117N
* 1117S
* 1127
* 1134
* 1156
* 1166
* 1168
* 1236

|

Other|

* AO 0235+164
* 3C 79
* CTA 21
* 1ES 0229+200
* IC 1801
* IC 1854
* PKS 0201+113
* PKS 0202+149
* QSO J0237+2848
* RBS 0413
* Segue 2
* UGC 2140

| Galaxy clusters|

* Abell 399
* Abell 401
* MS 0302+17

|

| Astronomical events|

* GRB 040924
* GRB 060218

|

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