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
Mass3.10 ± 0.65[3] M
Age4 × 108[3] years
HD 44780 B
Mass3.02 ± 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

  1. 1 2 3 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
  2. 1 2 3 SIMBAD, "HD 44780 -- Spectroscopic binary" (accessed 2011-11-30)
  3. 1 2 3 4 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)


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