Theta1 Orionis B

Theta¹ Orionis B
Observation data Epoch Equinox
Theta¹ Orionis B and nearby stars in the Trapezium Cluster
Constellation	Orion
Right ascension	5^h 35^m 16.112^s^[1]
Declination	−5° 23′ 6.89″^[1]
Apparent magnitude (V)	6.72 to 7.65^[2]
Characteristics
Evolutionary stage	B1V^[1]
Astrometry

Radial velocity (R_v)	26^[1] km/s

Orbit
Period (P)	6.471 days^[2]
Other designations
BM Ori, 41 Ori B, HD 37021, 2MASS J05351611-0523068, TYC 4774-954-1
Database references
SIMBAD	data

Theta¹ Orionis B, also known as BM Orionis, is a variable quadruple star system. It is also one of the main stars of the Trapezium Cluster, with the others being A, C, and D. Further stars in the core of the Trapezium have also been assigned letters: E and F are about 11th magnitude, while G and H (sometimes HH since it is double) are much fainter.

References

1 2 3 4 "* tet01 Ori B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 15, 2016.
1 2 "Trapezium (Theta1 Orionis)". David Darling. Retrieved December 15, 2016.

Stars of Orion
Bayer	α (Betelgeuse) β (Rigel) γ (Bellatrix) δ (Mintaka) ε (Alnilam) ζ (Alnitak) η (Algjebba) θ¹ Trapezium Cluster θ¹ A θ¹ B θ¹ C θ¹ D θ¹ E θ² ι κ (Saiph) λ (Meissa) μ ν ξ ο¹ ο² π¹ π² π³ (Tabit) π⁴ π⁵ π⁶ ρ σ τ υ (Thabit) φ¹ φ² χ¹ χ² ψ¹ ψ² ω
Flamsteed	5 6 (g) 11 13 14 (i) 15 16 (h) 18 21 22 (o) 23 (m) 27 (p) 29 (e) 31 32 (A) 33 35 38 42 (c) 45 49 (d) 51 (b) 52 55 56 57 59 60 63 64 66 68 69 (f¹) 71 72 (f²) 73 74 (k) 75 (l)
Variable	S T U W Z RS UX VV VY YY AN BF BL BM BN BQ CK CN CO CZ DN DY ER EW EY FH FT FU FZ GG GP GU GW HK KX V346 V351 V359 V371 V372 V380 V586 V883 V901 V1031 V1046 V1051 V1107 V1118 V1149 V1155 V1156 V1159 V1162 V1179 V1192 V1197 V1261 V1307 V1309 V1355 V1357 V1366 V1369 V1377 V1389 V1647 V1649 V1788
HR	1507 1519 1522 1534 1553 1571 1574 1576 1578 1591 1596 1600 1613 1618 1619 1646 1681 1684 1685 1687 1691 1697 1701 1703 1709 1717 1724 1748 1759 1763 1764 1778 1781 1782 1786 1799 1803 1806 1807 1809 1819 1820 1826 1830 1832 1833 1840 1848 1861 1873 1874 1883 1886 1887 1891 1908 1911 1913 1918 1920 1923 1933 1940 1942 1950 1952 1955 1959 1967 1978 1986 1987 1988 2007 2014 2019 2024 2030 2039 2048 2051 2057 2070 2071 2075 2076 2093 2097 2099 2113 2133 2174 2184 2191 2214 2218 2222 2231 2233 2235 2236 2251 2253 2259 2269 2275 2287 2302
HD	30869 31253 31423 33636 34445 35575 35775 36150 36558 36629 36814 36840 37605 37806 37903 38087 38801 290327
Gliese	Gliese 179 Gliese 182 Gliese 205 Gliese 208 Gliese 221 GJ 3379
Other	BD +03 740 Becklin–Neugebauer Object CVSO 30 G 99-37 G 99-47 LkHα 208 LP 658-2 2MASS J05352184-0546085 OMC-2 FIR 4 Orion source I Reipurth 50 Ross 47 RX J0529.4+0041 S Ori 52 S Ori 70 4U 0614+091 WISE J0457-0207 WISE J0521+1025
List

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