HD44780
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For the Hitachi product, see Hitachi HD44780 LCD controller.
| 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 |
| Semimajor 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]
[edit] References
- ^ 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)
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