HD 44780

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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]

  1. ^ 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 , Bibcode1986JRASC..80...91G
  2. ^ a b c SIMBAD, "HD 44780 -- Spectroscopic binary" (accessed 2011-11-30)
  3. ^ 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 
  4. ^ VizieR, HD 044780 (accessed 2011-11-30)