Global InformationV1400 Centauri information
 A visual band light curve for V1400 Centauri, showing the 2007 eclipse. The main plot shows the SuperWASP data.[1] The inset plot, adapted from Mamajek et al.,[2] shows the data near mid-eclipse. The purple markers show the pairs of small brightness dips due to eclipses by rings. | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 14h 07m 47.92976s[3] |
| Declination | −39° 45′ 42.7671″[3] |
| Apparent magnitude (V) | 12.2 - ~15.6[4] |
| Characteristics | |
| Evolutionary stage | pre-main sequence[2] |
| Spectral type | K5 IV(e) Li[2] |
| Variable type | rotational T Tau and eclipsing[4] |
| Astrometry | |
| Radial velocity (Rv) | 5.65±2.92[3] km/s |
| Proper motion (μ) | RA: −23.108±0.015 mas/yr[3] Dec.: −21.048±0.017 mas/yr[3] |
| Parallax (π) | 7.2351 ± 0.0140 mas[3] |
| Distance | 450.8 ± 0.9 ly (138.2 ± 0.3 pc) |
| Details | |
| Mass | 0.9[2] M☉ |
| Radius | >0.93±0.02[5] R☉ |
| Luminosity | 0.34[3] L☉ |
| Surface gravity (log g) | 4.30[3] cgs |
| Temperature | 4400±100[6] K |
| Rotation | 3.21±0.01 d[7] |
| Age | 16[2] Myr |
| Other designations | |
V1400 Cen, GSC 07807-00004, 2MASS J14074792-3945427, 1SWASP J140747.93-394542.6[8] | |
| Database references | |
| SIMBAD | data |
V1400 Centauri (also known as 1SWASP J140747.93−394542.6, J1407 and Mamajek's Object) is a pre-main-sequence star in the constellation Centaurus at a distance of about 451 light-years from Earth.[6][9] A relatively young star, its age is estimated to be 16 million years, and its mass is about 90% that of the Sun.[2][10] The star has a maximum apparent magnitude of 12.2 and requires a telescope to be seen. The star's name comes from the SuperWASP (Wide Angle Search for Planets) program and the star's coordinates.
In 2007, J1407 was observed to be eclipsed and possibly orbited by at least one major body, 1SWASP J1407b[11] (shortened as J1407b). J1407b is thought to be either a large gas giant planet or a brown dwarf with an immense ring system.[2][6][12] Subsequent observations have not successfully detected J1407b, suggesting that it may be on a highly eccentric orbit around the star,[5] or that it is a rogue object that coincidentally transited V1400 Centauri.[13]
By 2021, it was discovered the parent star is strongly variable, with a 5.4-year long magnetic activity cycle, and no evidence was detected of additional planets or a repeat of the deep eclipses attributed to a transiting ring system.[14]
- ^ "Search SuperWASP Time Series". NASA Exoplanet Archive. NASA. Archived from the original on 27 November 2022. Retrieved 27 November 2022.
- ^ a b c d e f g Mamajek, Eric E.; Quillen, Alice C.; Pecaut, Mark J.; Moolekamp, Fred; Scott, Erin L.; Kenworthy, Matthew A.; Collier Cameron, Andrew; Parley, Neil R. (March 2012). "Planetary Construction Zones in Occultation: Discovery of an Extrasolar Ring System Transiting a Young Sun-like Star and Future Prospects for Detecting Eclipses by Circumsecondary and Circumplanetary Disks". The Astronomical Journal. 143 (3): 72. arXiv:1108.4070. Bibcode:2012AJ....143...72M. doi:10.1088/0004-6256/143/3/72. S2CID 55818711.
- ^ a b c d e f g Cite error: The named reference
GaiaDR3was invoked but never defined (see the help page). - ^ a b "V1400 Cen". International Variable Star Index. AAVSO. Archived from the original on 2023-08-01. Retrieved 2023-08-01.
- ^ a b Rieder, Steven; Kenworthy, Matthew A. (21 November 2016). "Constraints on the size and dynamics of the J1407b ring system". Astronomy & Astrophysics. 596 (A9): A9. arXiv:1609.08485. Bibcode:2016A&A...596A...9R. doi:10.1051/0004-6361/201629567. S2CID 118413749.
- ^ a b c Kenworthy, Matthew A.; Mamajek, Eric E. (January 22, 2015). "Modeling giant extrasolar ring systems in eclipse and the case of J1407b: sculpting by exomoons?". The Astrophysical Journal. 800 (2): 126. arXiv:1501.05652. Bibcode:2015ApJ...800..126K. doi:10.1088/0004-637X/800/2/126. S2CID 56118870.
- ^ Cite error: The named reference
Kenworthy2014was invoked but never defined (see the help page). - ^ Cite error: The named reference
SIMBADwas invoked but never defined (see the help page). - ^ St. Fleur, Nicholas (October 13, 2016). "Distant Ringed Object Could Be 'Saturn on Steroids'". New York Times. Archived from the original on May 20, 2018. Retrieved October 14, 2016.
- ^ "Eclipsing Ring System J1407". Cerro Tololo Inter-American Observatory. June 22, 2012. Archived from the original on July 12, 2017. Retrieved January 27, 2015.
- ^ Cite error: The named reference
exoplanetcatalogwas invoked but never defined (see the help page). - ^ "Gigantic ring system around J1407b much larger, heavier than Saturn's". University of Rochester. January 26, 2015. Archived from the original on August 21, 2017. Retrieved January 27, 2015.
- ^ Cite error: The named reference
Kenworthy2020was invoked but never defined (see the help page). - ^ Cite error: The named reference
Barmentloo2021was invoked but never defined (see the help page).