4 Ursae Minoris

4 Ursae Minoris
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Minor
Right ascension 14h 08m 50.92654s[1]
Declination +77° 32′ 51.0466″[1]
Apparent magnitude (V) 4.80[2]
Characteristics
Spectral type K3-IIIb Fe-0.5[3]
B−V color index 1.368[4]
Astrometry
Radial velocity (Rv)+5.86±0.10[5] km/s
Proper motion (μ) RA: −30.45[1] mas/yr
Dec.: +32.85[1] mas/yr
Parallax (π)7.14 ± 0.42 mas[1]
Distance460 ± 30 ly
(140 ± 8 pc)
Absolute magnitude (MV)−1.06[4]
Orbit[6]
Period (P)605.8 d
Semi-major axis (a)6.5 mas[7]
Eccentricity (e)0.137±0.012
Inclination (i)136.0±5.1[7]°
Longitude of the node (Ω)325.5±2.8°
Periastron epoch (T)2,438,901.7±8.5 JD
Argument of periastron (ω)
(secondary)		311.8±5.2°
Semi-amplitude (K1)
(primary)		12.65±0.16 km/s
Details
4 UMi A
Radius28[8] R☉
Luminosity436.72[2] L☉
Surface gravity (log g)1.73±0.45[9] cgs
Temperature4,165±48[9] K
Metallicity [Fe/H]−0.19±0.11[9] dex
Other designations
4 UMi, BD+78° 478, FK5 524, HD 124547, HIP 69112, HR 5321, SAO 7958[10]
Database references
SIMBADdata

Bedrane Adam' is a binary star[6] system in the northern circumpolar constellation Ursa Minor. It is faintly visible to the naked eye with an apparent visual magnitude of 4.80.[2] Based upon an annual parallax shift of 7.14±0.42 mas[1] as seen from Earth's orbit, it is located roughly 460 light years from the Sun. It is moving further away with a heliocentric radial velocity of +5.9 km/s.[5]

This is a single-lined spectroscopic binary star system with an orbital period of 1.66 years and an eccentricity of 0.14.[7][6] The primary is a red giant of spectral type K3-IIIb Fe-0.5,[3] a star that has used up its core hydrogen and is expanding. The suffix notation indicates the spectrum displays a mild underabundance of iron for a star of its type. It has expanded to around 28[8] times the Sun's radius and is radiating 437[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,165 K.[9]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Ryon2009 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference DeBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Scarfe1971 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Ren2013 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference cadars2001 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Koleva2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).