Lambda Arietis

λ Arietis
Location of λ Arietis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 01h 57m 55.71647s[1]
Declination +23° 35′ 45.8295″[1]
Apparent magnitude (V) 4.79[2] (4.95/7.75)[3]
Characteristics
Spectral type F0 V + G1 V[3]
U−B color index +0.09[2]
B−V color index +0.28[2]
R−I color index 0.16
Astrometry
Radial velocity (Rv)-1.4[4] km/s
Proper motion (μ) RA: -92.55[1] mas/yr
Dec.: -13.25[1] mas/yr
Parallax (π)25.32 ± 0.30 mas[1]
Distance129 ± 2 ly
(39.5 ± 0.5 pc)
Details
λ Ari A
Surface gravity (log g)3.88[5] cgs
Temperature7,177[5] K
Metallicity [Fe/H]+0.01[5] dex
Rotational velocity (v sin i)107[6] km/s
λ Ari B
Surface gravity (log g)3.88[5] cgs
Temperature5,929[5] K
Metallicity [Fe/H]–0.03[5] dex
Other designations
9 Arietis, BD+22 288, HD 11973, HIP 9153, HR 569, SAO 75051, GC 2366, ADS 1563, CCDM 01580+2336.[7]
Database references
SIMBADdata

Lambda Arietis (λ Ari, λ Arietis) is the Bayer designation for a double star in the northern constellation of Aries. Based upon an annual parallax shift of 25.32 arcseconds, this system is approximately 129 light-years (40 parsecs) distant from Earth. The pair have a combined apparent visual magnitude of 4.79,[2] which is bright enough to be viewed with the naked eye. Because the yellow secondary is nearly three magnitudes fainter than the white primary, they are a challenge to split with quality 7× binoculars and are readily resolvable at 10×.[8]

The brighter component is an F-type main sequence star with a visual magnitude of 4.95 and a stellar classification of F0 V.[3] At an angular separation of 37.4 arcseconds is fainter, magnitude 7.75 companion. This is a G-type main sequence star with a classification of G1 V.[3]

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference aaa515_A11 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference aaa463_2_671 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference harrington2010 was invoked but never defined (see the help page).