HD 44780

For the Hitachi product, see Hitachi HD44780 LCD controller.

HD 44780

Observation data
Epoch J2000.0      Equinox J2000.0

Constellation
Gemini[1]

Right ascension
06h 24m 43.748s[2]

Declination
+25° 02′ 55.37″[2]

Apparent magnitude (V)
6.356

Characteristics

Spectral type
K2 III

Orbit[3]

Period (P)
577 days

Semi-major axis (a)
4.16 ± 1.28 mas

Eccentricity (e)
0.24

Inclination (i)
109 ± 12°

Details

HD 44780 A

Mass
3.10 ± 0.65[3] M☉

Age
4 × 108[3] years

HD 44780 B

Mass
3.02 ± 0.64[3] M☉

Other designations

BD+25 1255, HIP 30501.[2]

HD 44780 is a star in the Henry Draper Catalogue. It is a spectroscopic binary star,[1] located about 3° north of Mu Geminorum.[4] It is composed of two giant stars, orbiting each other with a period of 577 days. This type of binary system is relatively rare.[1]
References[edit]

^ a b c R.F. Griffin, “The spectroscopic orbits of HD 44780 and 65 Geminorum”, Journal of the Royal Astronomical Society of Canada, April 1986, vol. 80, p. 91-108, ISSN 0035-872X , Bibcode: 1986JRASC..80…91G
^ a b c SIMBAD, “HD 44780 — Spectroscopic binary” (accessed 2011-11-30)
^ a b c d Pourbaix, D.; Boffin, H. M. J. (February 2003), “Reprocessing the Hipparcos Intermediate Astrometric Data of spectroscopic binaries. II. Systems with a giant component”, Astronomy and Astrophysics, 398: 1163–1177, arXiv:astro-ph/0211483, Bibcode:2003A&A…398.1163P, doi:10.1051/0004-6361:20021736 
^ VizieR, HD 044780 (accessed 2011-11-30)

v
t
e

Stars of Gemini

Bayer

α (Castor)
β (Pollux)
γ (Alhena)
δ (Wasat)
ε (Mebsuta)
ζ (Mekbuda)
η (Propus)
θ
ι
κ
λ
μ (Tejat Posterior)
ν
ξ (Alzirr)
ο
π
ρ
σ
τ
υ
φ
χ
ω

Flamsteed

1
2
3
4
5
6
8
9
10
11
12
14
15
16
19
20
22
23
25
26
28
30
32
33
35
36
37
38
39
40
41
44
45
47
48
49
51
52
53
56
57
58
59
61
63
64
65
67
68
70
74
76
79
81
82
84
85
141 Tau

Variable

R
U
W
RR
RW
RX
RY
SS
TU
TV
WY
ZZ
AD
AF
AL
AW
BG
BM
BN
CR
DM
DN
DX
IR
IS
NP
NQ
NZ
OT
OU
OY
PQ
PS
PZ
V345

HR

2111
2169
2277
2304
2340
2366
2391
2417
2436
2439
2449
2457
2499
2533
2586
2597
2632
2635
2643
2649
2651
2660
2665
2669
2673
2692
2757
2780
2858
2877
2896
2926
2931
2936
2951
2953
2962
2965
2978
3030
3040
3053

HD

44780
45314
50554
54986
56176
58898

Gliese

Gliese 232
Gliese 251
GJ 1093

Other

BD+20°1790
CXOU J061705.3+2
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