2 Andromedae

Not to be confused with Andromeda II.

2 Andromedae
Observation data Epoch J2000 Equinox J2000
Constellation	Andromeda
Right ascension	23^h 02^m 36.38^s^[1]
Declination	+42° 45′ 28.1″^[1]
Apparent magnitude (V)	5.093
Characteristics
Spectral type	A3Vn
U−B color index	0.11
B−V color index	0.09
Astrometry
2 Andromedae A
Radial velocity (R_v)	2 km/s
Proper motion (μ)	RA: 56.38 ± 0.30^[1] mas/yr Dec.: −4.47 ± 0.38^[1] mas/yr
Parallax (π)	7.74 ± 0.51^[1] mas
Distance	420 ± 30 ly (129 ± 9 pc)
Absolute magnitude (M_V)	3000610000000000000♠−0.39±0.16^[2]
2 Andromedae B
Absolute magnitude (M_V)	7000188000000000000♠1.88±0.16^[2]
Orbit^[3]
Companion	2 Andromedae B
Period (P)	73.997 ± 0.509 yr
Semi-major axis (a)	0.225 ± 0.011"
Eccentricity (e)	0.800 ± 0.056
Inclination (i)	21.7 ± 46.0°
Longitude of the node (Ω)	159.5 ± 2.0°
Periastron epoch (T)	1870.280 ± 0.595
Other designations
BD+41° 4665, GJ 886.1 A, HD 217782, HIP 113788, HR 8766, SAO 52623
Database references
SIMBAD	data
Database references
SIMBAD	data

2 Andromedae (abbreviated 2 And) is a binary star in the constellation Andromeda. 2 Andromedae is the Flamsteed designation. Its apparent magnitude is 5.09.

The binary nature of the star was discovered by Sherburne Wesley Burnham at Lick Observatory in 1889.^[4]

References

1 2 3 4 5 van Leeuwen, F. (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. Vizier catalog entry
1 2 Jerzykiewicz, M.; et al. (2015). "The 2003–2004 multisite photometric campaign for the β Cephei and eclipsing star 16 (EN) Lacertae with an appendix on 2 Andromedae, the variable comparison star". Monthly Notices of the Royal Astronomical Society. 454 (1): 724–740. arXiv:1508.05250. Bibcode:2015MNRAS.454..724J. doi:10.1093/mnras/stv1958.
↑ Rica Romero, F. M. (2010). "Orbital elements for eight binaries. Study of the nature of wide components. I" (PDF). Revista Mexicana de Astronomía y Astrofísica. 46: 263–277. Bibcode:2010RMxAA..46..263R.
↑ Burnham, S. W. (1894). "Sixteenth Catalogue of New Double Stars Discovered at the Lick Observatory". Publications of Lick Observatory. 2: 197–205. Bibcode:1894PLicO...2..197B.

Bayer	α (Alpheratz) β (Mirach) γ (Almach) δ ε ζ η θ ι κ λ μ ν ξ (Adhil) ο π ρ σ τ υ (Titawin) φ χ ψ ω

Flamsteed	2 3 4 5 6 7 8 9 10 11 12 13 14 15 18 22 23 26 28 32 36 39 41 44 45 47 49 51 55 56 58 59 60 62 63 64 65 66 6 Per

Variable	R S T U W X Y Z RR RS RT RU RV RW RX RY SS ST SU SW TU TW VX WZ XX XZ AB AC AD AE AF AR BM BX CC CG CN DS DX EG ET EU FF GO GP GR GY HN KK KX KZ LL LN LP LQ OP OS OU PX PY QR QX V385 V455 V529

HR	1 8 17 36 40 44 52 53 56 71 75 78 79 104 110 122 134 152 156 157 178 205 249 272 275 282 283 289 355 372 376 379 396 409 415 452 483 495 504 518 521 551 552 556 619 647 653 671 673 679 687 746 748 756 768 769 8744 8801 8837 8857 8875 8884 8925 8927 8941 8950 8955 8962 8973 8977 8986 9011 9053 9057 9074 9086 9105 9107

HD	800 8673 11884 13931 14633 15082 16175 217731 218365 218393 218915 222155

Other	ADS 48 Groombridge 34 (GX/GQ) HAT-P-6 HAT-P-16 HAT-P-19 HAT-P-28 HAT-P-32 M31V J004437.99+412923.6 NGC 44 PSR B2303+46 PSR J0218+4232 Ross 248 (HH) WASP-1 WISE 0146+4234

Planetary	M 1-1 NGC 7662

Messier	31 32 110

NGC	5 11 13 19 20 27 29 39 43 48 49 51 67 67A 68 69 70 71 72 72A 74 76 79 80 81 83 85 86 90 93 94 96 97 108 109 112 140 149 160 169 181 183 184 214 218 226 228 229 233 243 252 258 260 262 266 280 304 317 389 393 404 425 431 477 512 513 528 529 531 536 537 542 551 561 562 573 590 591 605 620 662 668 679 687 700 703 704 705 708 709 710 712 714 717 721 732 746 753 759 797 801 812 818 828 834 841 845 846 891 898 906 909 910 911 912 913 914 920 923 933 937 946 980 982 995 996 999 1000 7440 7445 7446 7449 7618 7640 7707 7831 7836

Other	Andromeda I Andromeda III Andromeda IV Andromeda V Andromeda VIII Andromeda IX Andromeda X Andromeda XI Andromeda XII Andromeda XXI B2 0206+35 3C 13 3C 46 3C 65 3C 66A 3C 66B IRAS 23365+3604 QSO B0133+476

Other

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