Omicron Persei

Short description: Triple star system in the constellation Perseus

ο Persei

Location of ο Persei (circled red)

Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation | Perseus

Right ascension |  03h 44m 19.13377s[1]
Declination | 32° 17′ 17.6874″[1]
Apparent magnitude (V) | 3.83[2]

Right ascension |  03h 44m 19.17122s[3]
Declination | 32° 17′ 18.5103″[3]
Apparent magnitude (V) | 6.68[4]
Characteristics

Spectral type | B1III / B2V[5]
U−B color index | -0.75[2]
B−V color index | +0.05[2]
Variable type | ellipsoidal[6]
Astrometry
Absolute magnitude (MV)| −4.4[5]

Proper motion (μ)|  RA: +6.091[1] mas/yr
Dec.: −9.732[1] mas/yr
Parallax (π)| 3.0224 ± 0.3827[1] mas
Distance| approx. 1,100 ly
(approx. 330 pc)
Orbit[5]
Primary| Aa
Companion| Ab
Period (P)| 4.4191447 days
Semi-major axis (a)| 33 R☉
Eccentricity (e)| 0.0
Inclination (i)| 39±15°
Semi-amplitude (K1)
(primary)| 111.8 km/s
Semi-amplitude (K2)
(secondary)| 155.0 km/s
Details

Mass| 14[7] M☉
Radius| 9.6[5] R☉
Surface gravity (log g)| 3.4[7] cgs
Temperature| 22,700[7] K
Rotational velocity (v sin i)| 70±5[5] km/s

Mass| 10[7] M☉
Radius| 8.9[5] R☉
Surface gravity (log g)| 4.0[7] cgs
Temperature| 21,000[7] K
Rotational velocity (v sin i)| 65±15[5] km/s
Age| 15[5] Myr
Other designations

Atik, 38 Persei, ADS 2726 AB, BD+31°642, CCDM J03443+3217AB, GC 4461, GSC 02359-01258, HIP 17448, HR 1131, HD 23180, SAO 56673, WDS J03443+3217AB

Database references
SIMBAD| data

Omicron Persei (ο Persei, abbreviated Omicron Per, ο Per) is a triple star system in the constellation of Perseus. From parallax measurements taken during the Hipparcos mission it is approximately 1,100 light-years (330 parsecs) from the Sun.

The system consists of a spectroscopic binary pair designated Omicron Persei A and a third companion Omicron Persei B.[8] A's two components are themselves designated Omicron Persei Aa (officially named Atik /ˈeɪtɪk/, the traditional name of the system)[9][10] and Ab.

## Contents

* 1 Etymology
* 2 Properties
* 3 Culture
* 4 See also
* 5 References
* 6 External links

## Etymology

ο Persei in optical light

ο Persei (Latinised to Omicron Persei) is the system's Bayer designation. The designations of the two constituents as Omicron Persei A and B, and those of A's components - Omicron Persei Aa and Ab \- derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[11]

It bore the traditional name Atik (also Ati, Al Atik), Arabic for "the shoulder". Some sources attribute the name Atik to the nearby, brighter star Zeta Persei.[12][13] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[14] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[15] It approved the name Atik for the component Omicron Persei A on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[10]

In Chinese, 卷舌 (Juǎn Shé), meaning Rolled Tongue, refers to an asterism consisting of Omicron Persei, Nu Persei, Epsilon Persei, Xi Persei, Zeta Persei and 40 Persei.[16] Consequently, the Chinese name for Omicron Persei itself is 卷舌五 (Juǎn Shé wu), "the Fifth Star of Rolled Tongue".[17]

## Properties

File:OmicronPerLightCurve.png

A light curve for Omicron Persei A, plotted from TESS data[18]

Omicron Persei A is a spectroscopic binary consisting of a spectral type B1 giant and a type B2 dwarf orbiting each other every 4.4 days. The orbit is near-circular although its inclination is not precisely known. The two stars are separated by approximately 33 R☉, the exact value depending on the inclination. The primary is approximately one magnitude brighter than the secondary at visual wavelengths.[5] The binary pair forms a rotating ellipsoidal variable star, which varies in brightness from visual magnitude 3.79 to 3.88 during the orbital period.[19]

Omicron Persei lies just north of the open cluster IC 348, but is not catalogued as a member. Both IC 348 and Omicron Persei belong to the Perseus OB2 association.[20]

## Culture

* In the TV series Futurama, the fictional planet Omicron Persei 8 is home to medicinal plants, and large aliens who often attack Earth.[21][22]
* The USS Atik was a ship of the United States Navy.

## See also

* Stars and planetary systems in fiction

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
2. ↑ 2.0 2.1 2.2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
3. ↑ 3.0 3.1 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
4. ↑ Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics 384: 180–189. doi:10.1051/0004-6361:20011822. Bibcode: 2002A&A...384..180F.
5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 Stickland, D. J.; Lloyd, C. (1998). "Spectroscopic binary orbits from ultraviolet radial velocities. Paper 28: Omicron Persei". The Observatory 118: 138. Bibcode: 1998Obs...118..138S.
6. ↑ Samus, N. N. 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.
7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Lyubimkov, L. S.; Rachkovskaya, T. M.; Rostopchin, S. I.; Tarasov, A. E. (1997). "The binary system o per: Orbital elements, component parameters, and helium abundance". Astronomy Reports 41 (5): 630. Bibcode: 1997ARep...41..630L.
8. ↑ "Displaying next number in catalog HIP => 17448". Multiple Star Catalog. http://www.ctio.noao.edu/~atokovin/stars/stars.php?cat=HIP&number=17448.
9. ↑ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
10. ↑ 10.0 10.1 "Naming Stars". IAU.org. https://www.iau.org/public/themes/naming_stars/.
11. ↑ Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
12. ↑ Mullaney, James, and Tirion, Wil (2009). The Cambridge Double Star Atlas, Chart 7. University Press, Cambridge. ISBN 978-0-521-49343-7.
13. ↑ Your Sky Object Catalogue: Named Stars
14. ↑ IAU Working Group on Star Names (WGSN), International Astronomical Union, https://www.iau.org/science/scientific_bodies/working_groups/280/, retrieved 22 May 2016.
15. ↑ "WG Triennial Report (2015-2018) - Star Names". p. 5. https://www.iau.org/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf.
16. ↑ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN:978-986-7332-25-7.
17. ↑ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 , Hong Kong Space Museum. Accessed on line November 23, 2010.
18. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
19. ↑ "omi Per". AAVSO. https://www.aavso.org/vsx/index.php?view=detail.top&oid=26207.
20. ↑ Stelzer, B.; Preibisch, T.; Alexander, F.; Mucciarelli, P.; Flaccomio, E.; Micela, G.; Sciortino, S. (2012). "X-ray view of IC 348 in the light of an updated cluster census". Astronomy and Astrophysics 537: A135. doi:10.1051/0004-6361/201118118. Bibcode: 2012A&A...537A.135S.
21. ↑ "Omicron Persei 8 meaning explored as hilarious Futurama memes spread". 30 November 2021. https://www.thefocus.news/tv/omicron-persei-8-meaning/.
22. ↑ "How Futurama is related to the new Omicron COVID variant" (in en). 28 November 2021. https://www.marca.com/en/lifestyle/tv-shows/2021/11/28/61a327fe268e3e001c8b4576.html.

## External links

* Atik

* v
* t
* e

Stars of Perseus

Bayer|

* α (Mirfak)
* β (Algol)
* γ
* δ
* ε
* ζ
* η (Miram)
* θ
* ι
* κ (Misam)
* λ
* μ
* ν
* ξ (Menkib)
* ο (Atik)
* π (Gorgonea Secunda)
* ρ (Gorgonea Tertia)
* σ
* τ
* φ
* ψ
* ω (Gorgonea Quarta)
* b

Flamsteed|

* 1
* 2
* 3
* 4 (g)
* 5
* 7 (χ)
* 8
* 9 (i)
* 10
* 11
* 12
* 14
* 16
* 17
* 20
* 21
* 24
* 29
* 30
* 31
* 32 (l)
* 34
* 36
* 40 (o)
* 42 (n)
* 43 (A)
* 48 (c)
* 49
* 50
* 52 (f)
* 53 (d)
* 54
* 55
* 56
* 57 (m)
* 58 (e)
* 59
* 1 Aur

Variable|

* S
* T
* U
* V
* X
* Z
* RS
* RT
* RV
* RW
* RY
* ST
* SU
* SV
* TZ
* UV
* UX
* UY
* VX
* XX
* XY
* XZ
* YZ
* AB
* AG
* AR
* AS
* AW
* AX
* BM
* DM
* DY
* FO
* GK
* IK
* IP
* IQ
* IU
* IW
* IX
* IZ
* KP
* KS
* KT
* KW
* LX
* V351
* V356
* V357
* V361
* V376
* V380
* V386
* V396
* V392
* V400
* V423
* V432
* V440
* V459
* V461
* V471
* V472
* V473
* V480
* V490
* V492
* V493
* V505
* V509
* V520 (61 And)
* V521
* V545
* V551
* V572
* V573
* V575
* V576
* V621
* V718

HR|

* 470
* 526
* 529
* 538
* 540
* 621
* 641
* 787
* 792
* 810
* 820
* 831
* 842
* 846
* 849
* 864
* 865
* 876
* 885
* 886
* 890
* 894
* 918 (k)
* 920
* 923
* 930
* 949
* 950
* 956
* 964
* 966
* 969
* 973
* 975
* 979
* 986
* 991
* 1001
* 1019
* 1034
* 1037
* 1041
* 1047
* 1051
* 1056
* 1059
* 1074
* 1097
* 1113
* 1127
* 1130
* 1133
* 1141
* 1160
* 1164
* 1176
* 1191
* 1197
* 1198
* 1207
* 1215
* 1226
* 1234
* 1286
* 1301
* 1330
* 1333
* 1337
* 1344
* 1371
* 1390
* 1419
* 1424
* 1482
* 1489
* 1493
* 1500
* 1514

HD|

* 13519
* 14433
* 14434
* 16691
* 16760
* 17092
* 17245
* 17605
* 21684
* 22781
* 23301
* 23596
* 25329
* 26702
* 29587

Other|

* BD+31 643
* BD+48 740
* G 38-29
* G 95-57
* GD 61
* GRO J0422+32
* HAT-P-15
* HAT-P-29
* IRAS 04296+3429
* L1448-IRS2E
* LkHα 101
* LRLL 54361
* NGC 1333 13
* NGC 1333 IRAS 2A
* NGC 1333 IRAS 4A
* NGC 1333 IRAS 4B
* NSV 1436
* PSR B0355+54
* PSR J0357+3205

* List

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