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PV Cephei
	; PV Cep is the bright spot located at the edge of Gyulbudaghian’s Nebula; Credit: ESA/Hubble & NASA. Acknowledgement: Alexey Romashin
Observation data; Epoch J2000 Equinox J2000
Constellation	Cepheus
Right ascension	20h 45m 53.943s
Declination	+67° 57′ 38.66″
Apparent magnitude (V)	14.58 - 18.08
Characteristics
Spectral type	A5Ve
Variable type	T Tau
Astrometry
Proper motion (μ)	RA: 8.228 mas/yr ; Dec.: −1.976 mas/yr
Parallax (π)	2.9100 ± 0.0593 mas
Distance	1,120 ± 20 ly ; (344 ± 7 pc)
Details
Mass	2.6 M☉
Radius	2.9 R☉
Luminosity	1 - 100 L☉
Temperature	8,150 K
Age	<1 Myr
Database references
SIMBAD	data

PV Cephei is a variable star of Orion type located in the constellation of Cepheus at a distance of about 1,100 light-years from Earth.^[9] In visible light it varies in brightness from magnitude 17 to 19, making it far too faint to be seen by the naked eye.^[10]

A red band light curve for PV Cephei, adapted from Lorenzetti *et al.* (2011)^[10]

PV Cephei's variability was first detected by Martin Cohen, Leonard Vello Kuhi and Eugene A. Harlan, and was announced in 1977.^[11] It was given its variable star designation in 1978.^[12] The star is embedded within Gyulbudaghian's Nebula, a reflection nebula. As the star's brightness changes, the nebula's shape changes dramatically.^[11]^[13]

References

^ "A changing fan". ESA/Hubble Picture of the Week. Retrieved 23 April 2013.
^ ^a ^b Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
^ ^a ^b ^c Kun, M.; Szegedi-Elek, E.; Moór, A.; Kóspál, Á.; Ábrahám, P.; Apai, D.; Kiss, Z. T.; Klagyivik, P.; Magakian, T. Yu.; Mező, Gy.; Movsessian, T. A.; Pál, A.; Rácz, M.; Rogers, J. (2011). "Inner disc rearrangement revealed by dramatic brightness variations in the young star PV Cep". Monthly Notices of the Royal Astronomical Society. 413 (4): 2689. arXiv:1101.2329. Bibcode:2011MNRAS.413.2689K. doi:10.1111/j.1365-2966.2011.18341.x. S2CID 118623750.
^ Watson, C. L. (2006). "The International Variable Star Index (VSX)". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25. 25: 47. Bibcode:2006SASS...25...47W.
^ 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.
^ ^a ^b ^c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b Caratti o Garatti, A.; Garcia Lopez, R.; Weigelt, G.; Tambovtseva, L. V.; Grinin, V. P.; Wheelwright, H.; Ilee, J. D. (2013). "LBT/LUCIFER near-infrared spectroscopy of PV Cephei. An outbursting young stellar object with an asymmetric jet". Astronomy and Astrophysics. 554: A66. arXiv:1304.6267. Bibcode:2013A&A...554A..66C. doi:10.1051/0004-6361/201321418. S2CID 46977755.
^ ^a ^b Vioque, M.; Oudmaijer, R. D.; Baines, D.; Mendigutía, I.; Pérez-Martínez, R. (2018). "Gaia DR2 study of Herbig Ae/Be stars". Astronomy and Astrophysics. 620: A128. arXiv:1808.00476. Bibcode:2018A&A...620A.128V. doi:10.1051/0004-6361/201832870. S2CID 118928804.
^ Saha, p.; Maheswar, G.; Mathew, B.; Kamath, U. S. (September 2021). "Star formation around three co-moving HAeBe stars in the Cepheus Flare". Astronomy & Astrophysics. 653: A142. arXiv:2104.12061. Bibcode:2021A&A...653A.142S. doi:10.1051/0004-6361/202039646. Retrieved 27 October 2024.
^ ^a ^b Lorenzetti, D.; Giannini, T.; Larionov, V. M.; Arkharov, A. A.; Antoniucci, S.; Di Paola, A.; Konstantinova, T. S.; Kopatskaya, E. N.; Li Causi, G.; Nisini, B. (May 2011). "Simultaneous monitoring of the photometric and polarimetric activity of the young star PV Cep in the optical/near-infrared bands". The Astrophysical Journal. 732 (2): 69. arXiv:1103.0183. Bibcode:2011ApJ...732...69L. doi:10.1088/0004-637X/732/2/69. S2CID 250811804. Retrieved 6 December 2021.
^ ^a ^b Cohen, M.; Kuhi, L. V.; Harlan, E. A. (August 1977). "A remarkable structural change in a faint cometary nebula". Astrophysical Journal. 215: L127 – L129. Bibcode:1977ApJ...215L.127C. doi:10.1086/182494. Retrieved 13 October 2024.
^ Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (April 1978). "63rd Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 1414. Bibcode:1978IBVS.1414....1K. Retrieved 13 October 2024.
^ Harrington, Phil. "Gyulbudaghian's Nebula". Astronomy. Firecrown Media. Retrieved 13 October 2024.