3 Vulpeculae

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3 Vulpeculae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vulpecula
Right ascension 19h 22m 50.885s[1]
Declination +26° 15′ 44.67″[1]
Apparent magnitude (V) 5.18[2]
Spectral type B6 III[3]
Variable type SPB[4]
Proper motion (μ) RA: 0.41±0.31[1] mas/yr
Dec.: −8.90±0.58[1] mas/yr
Parallax (π)8.30 ± 0.60[1] mas
Distance390 ± 30 ly
(120 ± 9 pc)
Period (P)367.7
Eccentricity (e)0.15
Semi-amplitude (K1)
6.8 km/s
Mass4.16[4] M
Surface gravity (log g)4.30[4] cgs
Temperature14,343[4] K
Mass0.6 - 1.1[4] M
Age25[4] Myr
Other designations
V377 Vulpeculae, BD+25° 3811, HD 182255, HIP 95260, HR 7358
Database references

3 Vulpeculae (abbreviated 3 Vul) is a binary star in the constellation Vulpecula. 3 Vulpeculae is its Flamsteed designation. It has been nicknamed "the Observer's Nightmare" (or its Latin free translation, "Spectatori Error Inextricabilis") by some astronomers[5][4] because it is difficult to study as its orbital period is close to a year and its pulsation is close to a day.[4]

It has been identified as a slowly pulsating B-type star,[4] a type of variable star of which only about 40 are visible to the naked eye.[citation needed]


  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S. 
  3. ^ Cucchiaro, A.; Macau-Hercot, D.; Jaschek, M.; Jaschek, C. (1977). "Spectral classification from the ultraviolet line features of S2/68 spectra. II - Late B-type stars". Astronomy and Astrophysics Supplement Series. 30: 71. Bibcode:1977A&AS...30...71C. 
  4. ^ a b c d e f g h i j Dukes, Robert; Kubinec, William; Kubinec, Angela; Adelman, Saul (2003). "A Photometric and Spectroscopic Study of 3 Vulpeculae: An Observer's Nightmare". The Astronomical Journal. 126 (1): 370. Bibcode:2003AJ....126..370D. doi:10.1086/375463. Retrieved 2016-08-09. 
  5. ^ Kaler, Jim. "3 Vul". Retrieved 2016-08-09.