Delta Monocerotis, a white subgiant star in Monoceros

Delta Monocerotis (HIP 34769)

Delta Monocerotis is a white subgiant star in the constellation Monoceros. At 384 light years away, it shines at an apparent visual magnitude of 4.15. Delta Monocerotis is the primary component of a multiple-star system. It is moving through the Galaxy at a speed of 15.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,400 and 29,800 light years from the center of the Galaxy. It came closest to the Sun 7.3 million years ago when it had brightened to magnitude 0.95 from a distance of 88 light years.

Sky position: RA 7h 11.9m, Dec -0° 29.4'

Common designations: Delta Monocerotis, 22 Monocerotis, HIP 34769, HD 55185

Brightest stars in Monoceros:
(list all)

Rank	Mag.	Star
1	3.76	Beta Monocerotis
2	3.94	Alpha Monocerotis
3	3.99	Gamma Monocerotis

4

| 4.15

) Delta Monocerotis

Rank	Mag.	Star
5	4.36	Zeta Monocerotis
6	4.39	Epsilon Monocerotis A
7	4.47	13 Monocerotis
8	4.48	18 Monocerotis
9	4.66	15 Monocerotis
10	4.69	28 Monocerotis
11	4.77	17 Monocerotis
12	4.91	20 Monocerotis
13	4.92	3 Monocerotis
14	4.93	27 Monocerotis
15	4.99	19 Monocerotis
16	5.04	2 Monocerotis
17	5.06	HR 2205

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

Galactic Orbit of Delta Monocerotis
(compared to the Sun)

E

ccentricity: 9.9% vs. 16.0%

Angle φ : 5.2°vs. 26.0°

Semi-major axis : 8,313 pc vs. 8,686 pc

Semi-minor axis: 8,272 pc vs. 8,574 pc

Focus-to-center

: 820 pcvs. 1,388 pc

Semilatus rectum : 8,232 pc vs. 8,464 pc

Perigalacticon: 7,493 pc vs. 7,297 pc

Apogalacticon

: 9,132 pcvs. 10,074 pc
  Some Tabulated XHIP Data for Delta Monocerotis
(see also: SIMBAD)

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

Position	Proper Motion
Right Ascension:	107.96608466° ±0.16 mas	-0.60 ±0.60 mas/yr.
Declination:	-0.49278066° ±0.11 mas	6.30 ±0.60 mas/yr.
Galactic Longitude:	215.70479480°	-5.88 mas/yr.
Galactic Latitude:	4.31802391°	2.35 mas/yr.

Parallax: 8.49 ± 0.17 mas

Spectrography

Spectral Type: A0 IV 1999MSS...C05....0H.

Radial Velocity: 15.00 ±4.10 km/s [A rating] 2006AstL...32..759G.

Iron Abundance [Fe/H]: n/a

Photometry
 

band	magnitude	Abs. Mag.
U
B	4.15	-1.21
V	4.15	-1.20
R
I	4.13	-1.23
J	4.04	-1.32
H	3.94	-1.41
K	3.90	-1.46

B-V: 0.00 V-I: +0.02

Derivations

Heliocentric distance: 117.73 pc (2.0% margin of error)

Galactocentric distance: 7,496 pc

Transverse velocity: 3.5 km/s

3D heliocentric position and motion:

toward:	Galactic center	Galactic rotation	North Galactic Pole
Position ( X, Y, Z)	-95.3 pc	-68.5 pc	8.9 pc
Velocity (U, V, W)	-14.0 km/s	-6.0 km/s	2.4 km/s