11 Orionis, a blue subgiant star in Orion

11 Orionis (HIP 23607)

11 Orionis is a blue subgiant star in the constellation Orion. At 365 light years away, it shines at an apparent visual magnitude of 4.65. It an intrinsic variable star that varies between magntitudes 4.64 and 4.67 over a period of 4.64 days. It is moving through the Galaxy at a speed of 25.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,400 and 24,500 light years from the center of the Galaxy. It came closest to the Sun 2.8 million years ago when it had brightened to magnitude 4.03 from a distance of 274 light years.

Sky position: RA 5h 4.6m, Dec +15° 24'

Common designations: 11 Orionis, HIP 23607, HD 32549

Stars of the Northern Hemisphere

The Modern Guide to the Stars Brightest stars in Orion:
(list all)

Rank	Mag.	Star
26	4.46	Rho Orionis
27	4.47	Pi-6 Orionis
28	4.50	Omega Orionis
29	4.53	HR 2113
30	4.58	42 Orionis
31	4.59	Psi Orionis
32	4.62	Thabit
33	4.64	Pi-1 Orionis
34	4.64	Chi-2 Orionis

| 4.65

) 11 Orionis

Rank	Mag.	Star
36	4.71	Omicron-1 Orionis
37	4.71	31 Orionis
38	4.72	22 Orionis
39	4.76	56 Orionis
40	4.77	49 Orionis
41	4.78	HR 1887
42	4.81	15 Orionis

Location of 11 Orionis circled Map detail from Stars of the Northern Hemisphere
Hover over other bright stars to identify or click to jump.

Galactic Orbit of 11 Orionis
(compared to the Sun)

ccentricity: 4.3% vs. 16.0%

Angle φ : 177.1°vs. 26.0°

Semi-major axis : 7,196 pc vs. 8,686 pc

Semi-minor axis: 7,189 pc vs. 8,574 pc

Focus-to-center

: 312 pcvs. 1,388 pc

Semilatus rectum : 7,182 pc vs. 8,464 pc

Perigalacticon: 6,884 pc vs. 7,297 pc

Apogalacticon

: 7,508 pcvs. 10,074 pc
Some Tabulated XHIP Data for 11 Orionis
(see also: SIMBAD)

Astrometry
2007A&A...474..653V

Position	Proper Motion
Right Ascension:	76.14224330° ±0.20 mas	17.90 ±0.20 mas/yr.
Declination:	15.40418045° ±0.13 mas	-31.16 ±0.15 mas/yr.
Galactic Longitude:	186.18242930°	35.82 mas/yr.
Galactic Latitude:	-15.34509899°	-2.88 mas/yr.

Parallax: 8.93 ± 0.24 mas

Spectrography

Spectral Type: B9IV 2009A&A...501..297Z.

Radial Velocity: 16.80 ±2.80 km/s [A rating] 2006AstL...32..759G.

Iron Abundance [Fe/H]: n/a

Photometry

band	magnitude	Abs. Mag.
U
B	4.59	-0.66
V	4.65	-0.59
R
I	4.64	-0.61
J	6.69	1.45
H	6.56	1.32
K	4.74	-0.51

B-V: -0.06 V-I: +0.01

Derivations

Heliocentric distance: 111.89 pc (2.7% margin of error)

Galactocentric distance: 7,507 pc

Transverse velocity: 19.1 km/s

3D heliocentric position and motion:

toward:	Galactic center	Galactic rotation	North Galactic Pole
Position ( X, Y, Z)	-107.3 pc	-11.6 pc	-29.6 pc
Velocity (U, V, W)	-13.7 km/s	-20.6 km/s	-5.9 km/s