Calvera (X-ray source)

X-ray source star in the constellation Ursa Minor

For other uses, see Calvera (disambiguation).

Calvera  Observation data
Epoch J2000.0 Equinox J2000.0 (ICRS)

Constellation | Ursa Minor
Right ascension | 14h 12m 55.867s[1]
Declination | +79° 22′ 03.895″[1]
Characteristics
Evolutionary stage | Neutron star
Astrometry
Proper motion (μ)|  RA: 78.1[2] mas/yr
Dec.: 8.0[2] mas/yr
Distance| ≤2000[1] pc
Details[1]
Rotation| 59.199071070 ms
Age| 285,000 years
Other designations
PSR J1412+7922, RX J1412.9+7922, 1RXS J141256.0+792204[3]
Database references
SIMBAD| data

In astronomy, Calvera (also known as 1RXS J141256.0+792204[4]) is an X-ray source in the constellation Ursa Minor, identified in 2007 as an isolated neutron star.[5][6] It is one of the hottest[7] and closest of its kind to Earth.[8]

It is named after the villain in the 1960 film The Magnificent Seven, as it is the eighth such neutron star known within 500 parsecs of Earth, and the seven previously discovered isolated neutron stars are called 'The Magnificent Seven'.

There is a ring of radio emission almost a degree in diameter, offset about 4′.9 from Calvera itself;[9] it is very likely its supernova remnant.[2]

## References

[edit]

1. ^ a b c d Bogdanov, Slavko; et al. (28 May 2019). "Neutron Star Interior Composition Explorer X-Ray Timing of the Radio and γ-Ray Quiet Pulsars PSR J1412+7922 and PSR J1849-0001". The Astrophysical Journal. 877 (2): 69. arXiv:1902.00144. Bibcode:2019ApJ...877...69B. doi:10.3847/1538-4357/ab1b2e. S2CID 119337118.
2. ^ a b c Rigoselli, M.; Mereghetti, S.; Halpern, J. P.; Gotthelf, E. V.; Bassa, C. G. (2024). "The Proper Motion of the High Galactic Latitude Pulsar Calvera". The Astrophysical Journal. 976 (2): 228. arXiv:2410.21828. Bibcode:2024ApJ...976..228R. doi:10.3847/1538-4357/ad8cd6.
3. ^ "RX J1412.9+7922". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 September 2020.
4. ^ In the ROSAT All-Sky Survey Bright Source Catalog (RASS/BSC).
5. ^ "Rare dead star found near Earth". August 20, 2007. Archived from the original on July 13, 2014. Retrieved August 21, 2007.
6. ^ Rutledge, R. E.; Fox, D. B.; Shevchuk, A. H. (2008-01-01). "Discovery of an Isolated Compact Object at High Galactic Latitude". The Astrophysical Journal. 672 (2): 1137–1143\. arXiv:0705.1011. Bibcode:2008ApJ...672.1137R. doi:10.1086/522667. ISSN 0004-637X.1137-1143&rft.date=2008-01-01&rft_id=info:arxiv/0705.1011&rft.issn=0004-637X&rft_id=info:doi/10.1086/522667&rft_id=info:bibcode/2008ApJ...672.1137R&rft.aulast=Rutledge&rft.aufirst=R.+E.&rft.au=Fox,+D.+B.&rft.au=Shevchuk,+A.+H.&rft_id=https://doi.org/10.1086%2F522667&rfr_id=info:sid/en.wikipedia.org:Calvera+(X-ray+source)" class="Z3988">
7. ^ Shevchuk, Andrew S. H.; Fox, Derek B.; Rutledge, Robert E. (2009-11-01). "Chandra Observations of 1RXS J141256.0+792204 (Calvera)". The Astrophysical Journal. 705 (1): 391–397\. arXiv:0907.4352. Bibcode:2009ApJ...705..391S. doi:10.1088/0004-637X/705/1/391. ISSN 0004-637X. S2CID 10807335.391-397&rft.date=2009-11-01&rft_id=https://api.semanticscholar.org/CorpusID:10807335#id-name=S2CID&rft_id=info:bibcode/2009ApJ...705..391S&rft_id=info:arxiv/0907.4352&rft.issn=0004-637X&rft_id=info:doi/10.1088/0004-637X/705/1/391&rft.aulast=Shevchuk&rft.aufirst=Andrew+S.+H.&rft.au=Fox,+Derek+B.&rft.au=Rutledge,+Robert+E.&rfr_id=info:sid/en.wikipedia.org:Calvera+(X-ray+source)" class="Z3988">
8. ^ Rutledge, Robert; Fox, Derek; Shevchuk, Andrew (2008). "Discovery of an Isolated Compact Object at High Galactic Latitude". The Astrophysical Journal. 672 (2): 1137–43\. arXiv:0705.1011. Bibcode:2008ApJ...672.1137R. doi:10.1086/522667. S2CID 7915388.1137-43&rft.date=2008&rft_id=info:arxiv/0705.1011&rft_id=https://api.semanticscholar.org/CorpusID:7915388#id-name=S2CID&rft_id=info:doi/10.1086/522667&rft_id=info:bibcode/2008ApJ...672.1137R&rft.au=Rutledge,+Robert&rft.au=Fox,+Derek&rft.au=Shevchuk,+Andrew&rfr_id=info:sid/en.wikipedia.org:Calvera+(X-ray+source)" class="Z3988">
9. ^ Arias, M.; Botteon, A.; Bassa, C. G.; Van Der Jagt, S.; Van Weeren, R. J.; o'Sullivan, S. P.; Bosschaart, Q.; Dullaart, R. S.; Hardcastle, M. J.; Hessels, J. W. T.; Shimwell, T.; Slob, M. M.; Sturm, J. A.; Tasse, C.; Theijssen, N. C. M. A.; Vink, J. (2022). "Possible discovery of Calvera's supernova remnant". Astronomy & Astrophysics. 667: A71. arXiv:2207.14141. Bibcode:2022A&A...667A..71A. doi:10.1051/0004-6361/202244369. S2CID 251135361.

## External links

[edit]

* Universe Today, Closest Neutron Star Discovered
* Pennsylvania State University. "Possible closest neutron star to Earth found" (Press release). August 20, 2007. Archived from the original on January 4, 2013. Retrieved August 21, 2007.

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Constellation of Ursa Minor

* List of stars in Ursa Minor
* Ursa Minor in Chinese astronomy

Stars|

| Bayer|

* α (Polaris)
* β (Kochab)
* γ (Pherkad)
* δ (Yildun)
* ε
* ζ
* η
* θ
* λ
* π1
* π2

|

Flamsteed|

* 3
* 4
* 5
* 6
* 8 (Baekdu)
* 9
* 10
* 11 (γ1)
* 12
* 14
* 17
* 19
* 20
* 24

Variable|

* R
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* V
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* Z
* RR
* RU
* RW
* SS
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HR|

* 5184
* 5596

HD|

* 150706

Other|

* Calvera
* H1504+65
* LP 40-365
* WD 1337+705
* WISE 1506+7027

| Exoplanets|

* β Ursae Minoris b
* 8 Ursae Minoris b (Halla)
* 11 Ursae Minoris b
* TOI-4138 b

|

Galaxies|

| NGC|

* 5034
* 5144
* 5939
* 6217
* 6251
* 6331

|

Other|

* 3C 309.1

| Galaxy clusters|

* Abell 2256

|

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