25 Serpentis

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This article is about A2 Serpentis. For other stars with this Bayer designation, see A Serpentis.
25 Serpentis
Location of 25 Serpentis (circled)
Observation data
ICRS
)
Constellation
Serpens
Right ascension 15h 46m 05.63636s[1]
Declination −01° 48′ 15.0830″[1]
Apparent magnitude (V) 5.37 - 5.40[2]
Characteristics
Spectral type B8IV/V[3]
U−B color index −0.40[4]
B−V color index −0.05[4]
Variable type SPB[5]
Distance
450 ± 20 ly
(138 ± 6 pc)
Semi-amplitude
(K1)
(primary)		43.1±0.7 km/s
Semi-amplitude (K2)
(secondary)		86±1 km/s
Details
Rotational velocity
(v sin i)		80 km/s
BD
−01°3092
Database references
SIMBADdata

25 Serpentis is a

Serpens Caput. With an apparent magnitude of 5.37, it is just barely visible to the naked eye. The system is estimated to be some 450 light-years (138 parsecs) based on its parallax.[1]

A light curve for PT Serpentis, plotted from Hipparcos data[10]

25 Serpentis is a

variable star designation
PT Serpentis.

References

  1. ^
    S2CID 18759600
    .
  2. ^ a b VSX; Otero, S. A (10 February 2012). "PT Serpentis". AAVSO Website. American Association of Variable Star Observers. Retrieved 28 May 2014.
  3. Bibcode:1999MSS...C05....0H
    .
  4. ^
    Bibcode:1986EgUBV........0M
    .
  5. Bibcode:2009yCat....102025S
    .
  6. S2CID 119387088
    .
  7. ^
    Bibcode:2000A&A...355.1015D
    .
  8. doi:10.1093/mnras/stv715
    .
  9. Bibcode:1979BICDS..17...38H
  10. ^ "Light Curve". Hipparcos ESA. ESA. Retrieved 17 February 2022.
  11. Bibcode:1950PDAO....8..225P
    .
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