5 Serpentis

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5 Serpentis
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 15h 19m 18.79710s[1]
Declination +01° 45′ 55.4685″[1]
Apparent magnitude (V) 5.10[2]
Characteristics
Spectral type F8 IV[3][4]
B−V color index 0.50[2]
Distance
82.8 ± 0.6 ly
(25.4 ± 0.2 pc)
Absolute magnitude (MV)3.02[6]
Details
5 Ser A
Gyr
HR 5694, SAO 120946, WDS J15193+0146A[8]
Database references
SIMBADdata

5 Serpentis is a wide

light years away. The brighter member is an IAU radial velocity standard star,[10] and it is moving away from the Sun with a heliocentric radial velocity of +54.3 km/s.[5] The system made its closest approach to the Sun about 153,000 years ago at a separation of 68 ly (20.7 pc).[6]

The primary, component A, is an

variable star designation MQ Ser,[11] but has been found not to be.[12] From observations made between 1975 and 1980, Bakos (1983) reported random, small brightness variations with an amplitude of less than 0.03 magnitude, plus three flare events that increased the brightness by 0.1 magnitudes.[13] However, Scarfe (1985) noted that these observations may instead be due to normal observational error.[10]

The

angular separation of 11.4″ along a position angle of 35°. It has an estimated orbital period of 3,371 years.[9] According to Hoffleit (1991), if this is a variable star it may account for the observations of Bakos (1983).[14]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    S2CID 118505114
    , 88.
  3. ^
    S2CID 117076031
    .
  4. ^
    doi:10.1051/0004-6361:20031084
    .
  5. ^
    S2CID 119231169
    .
  6. ^
    S2CID 119257644
    .
  7. S2CID 46328823
    , A40.
  8. ^ "5 Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-17.
  9. ^
    S2CID 56066740
    , 87.
  10. ^
    Bibcode:1985JRASC..79..180S
    .
  11. Bibcode:1985IBVS.2681....1K
    .
  12. ^ VSX; Otero, S. A. (13 November 2011). "MQ Serpentis". AAVSO Website. American Association of Variable Star Observers. Retrieved 18 July 2014.
  13. doi:10.1086/113357
    .
  14. Bibcode:1991JAVSO..20..239H
    .
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