Lambda Ursae Minoris

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λ Ursae Minoris

A light curve for Lambda Ursae Minoris, plotted from Hipparcos data[1]
Observation data
J2000.0
Constellation Ursa Minor
Right ascension 17h 16m 56.4107s[2]
Declination +89° 02′ 15.734″[2]
Apparent magnitude (V) +6.38[3]
Characteristics
Spectral type M3+ IIIa[4]
U−B color index +1.79[5]
B−V color index +1.57[5]
Variable type SRb[6]
Distance
880 ± 30 ly
(270 ± 10 pc)
Absolute magnitude (MV)−0.85[7]
Details
Radius64[2] R☉
Luminosity741[2] L☉
Temperature3,772[2] K
HIP 84535, SAO
3020
Database references
SIMBADdata

Lambda Ursae Minoris (λ UMi, λ Ursae Minoris) is a

light years from Earth
.

Lambda Ursae Minoris is an

semiregular variable star and its brightness varies by about 0.1 magnitudes.[6] Its variability was discovered from Hipparcos astrometry and it was entered into the General Catalogue of Variable Stars in 1999.[9]

This star was used from 1882 as a reference to measure the magnitudes of stars in the northern hemisphere for the

1908 Revised Harvard Photometry catalogue. Sigma Octantis was used for the southern hemisphere. It was then noted that "Neither of these stars appears to vary perceptibly" but that, due to the procedures used "if they did, the variation would have no effect on the final measures."[10]

References

  1. ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  2. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  3. Bibcode:2002yCat.2237....0D
    .
  4. Bibcode:1967PDAO...13...47Y
    .
  5. ^
    Bibcode:1991bsc..book.....H
    .
  6. ^
    Bibcode:2009yCat....102025S
    .
  7. S2CID 119257644
    .
  8. doi:10.1086/116239
    .
  9. Bibcode:1999IBVS.4659....1K
    .
  10. Bibcode:1908AnHar..50....1P
    .

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Lambda_Ursae_Minoris&oldid=1210073766"