66 Arietis - Misplaced Pages

Star in the constellation Aries

66 Arietis
Observation data Epoch J2000 Equinox J2000
Constellation	Aries
Right ascension	03 28 26.56850
Declination	+22° 48′ 14.4271″
Apparent magnitude (V)	6.03 (6.2/10.4)
Characteristics
Spectral type	K0 IV
B−V color index	0.964
Astrometry

Radial velocity (R_v)	+48.99 ± 0.16 km/s
Proper motion (μ)	RA: +2.12 mas/yr Dec.: –110.85 mas/yr
Parallax (π)	15.52 ± 0.81 mas
Distance	210 ± 10 ly (64 ± 3 pc)

Details
66 Ari A
Radius	6 `R`_☉
Luminosity	18 `L`_☉
Surface gravity (log g)	3.0 cgs
Temperature	4,864 K
Rotational velocity (v sin i)	1.6 km/s

Other designations
BD+22° 495, HD 21467, HIP 16181, HR 1048, SAO 75945, WDS J03284+2248.
Database references
SIMBAD	data

66 Arietis (abbreviated 66 Ari) is a double star in the northern constellation of Aries. 66 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 6.03, putting it near the limit for naked eye visibility. The magnitude 10.4 companion is located at an angular separation of 0.810 arcseconds from the primary along a position angle of 65°. The distance to this pair, as determined from parallax measurements made during the Hipparcos mission, is approximately 210 light-years (64 parsecs).

The spectrum of the primary component matches a stellar classification of K0 IV, with the luminosity class of IV indicating this is a subgiant star. It has 6 times the radius of the Sun and shines with 18 times the Sun's energy. This energy is radiated from the outer atmosphere at an effective temperature of 4,864 K, giving it the cool orange-hued glow of a K-type star.

References

^ van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ Oja, T. (September 1993), "UBV photometry of stars whose positions are accurately known. VII", Astronomy and Astrophysics Supplement Series, 100 (3): 591–592, Bibcode:1993A&AS..100..591O.
^ Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics, 356: 141–145, Bibcode:2000A&A...356..141F.
^ Harlan, E. A. (September 1969), "MK classifications for F- and G-type stars. I", Astronomical Journal, 74: 916–919, Bibcode:1969AJ.....74..916H, doi:10.1086/110881.
^ Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
"* 66 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-18.

Bayer	α (Hamal) β (Sheratan) γ (Mesarthim) δ (Botein) ε ζ η θ ι κ λ μ ν ξ ο π ρ ρ ρ σ τ τ
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	TZ UX VZ (16 Tri)
HR	577 728 803 952 999
HD	12661 20367
Other	BD+20°307 HIP 14810 HAT-P-25 Teegarden's Star WASP-11/HAT-P-10 WD 0145+234

Exoplanets	α Arietis b HD 12661 b c HIP 14810 b c d Teegarden's Star b c WASP-11b/HAT-P-10b

NGC	677 680 691 694 695 716 765 770 772 781 803 817 820 821 871 877 900 901 903 904 918 935 938 972 990 992 1024 1134 1156
Other	1ES 0229+200 3C 79 4C +28.07 AO 0235+164 IC 167 IC 1801 PSO J0309+27 Segue 2 UGC 2140

Galaxy clusters	MS 0302+17

Astronomical events	GRB 060218