Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Indus [1] |
Right ascension | 21h 39m 39.3s [2] |
Declination | −70° 28′ 17.4″ [2] |
Characteristics | |
Spectral type | F0V [3] |
Astrometry | |
Distance | 3630±110
[3]
ly (1113±33 [3] pc) |
Absolute magnitude (MV) | 2.5 [2] |
Details | |
Temperature | 6800±110 [3] K |
Other designations | |
2MASS ASAS-SN-V J213939.3-702817.4, J213939.3-702817.4 | |
Database references | |
SIMBAD | data |
ASASSN-V J213939.3-702817.4 (also known as ASAS-SN-V J213939.3-702817.4 and J213939.3-702817.4) is a star, previously non-variable, found to be associated with an unusual, deep dimming event that was uncovered by the All Sky Automated Survey for SuperNovae (ASAS-SN) project, and first reported on 4 June 2019 in The Astronomer's Telegram. [2] [3] [4]
The star, in the constellation of Indus, about 3,630 ± 110 light-years (1,113 ± 33 pc) [3] [5] away, was first observed on 15 May 2014 (UT) by ASAS-SN, and, as of 4 June 2019, has resulted in more than 1780 data points, including a quiescent mean magnitude of g~12.95. [2] On 4 June 2019, the star was reported to have dimmed gradually from g~11.96 at HJD 2458635.78, to g~14.22 at 4458837.45, and, as of 4 June 2019, seems to be returning to its quiescent state of g~13.29 at HJD 2851634.89. [2] According to astronomer Tharindu Jayasinghe, one of the discoverers of the deep dimming event, "[The star has] been quiescent for so long and then suddenly decreased in brightness by a huge amount ... Why that happened, we don't know yet." [4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Indus [1] |
Right ascension | 21h 39m 39.3s [2] |
Declination | −70° 28′ 17.4″ [2] |
Characteristics | |
Spectral type | F0V [3] |
Astrometry | |
Distance | 3630±110
[3]
ly (1113±33 [3] pc) |
Absolute magnitude (MV) | 2.5 [2] |
Details | |
Temperature | 6800±110 [3] K |
Other designations | |
2MASS ASAS-SN-V J213939.3-702817.4, J213939.3-702817.4 | |
Database references | |
SIMBAD | data |
ASASSN-V J213939.3-702817.4 (also known as ASAS-SN-V J213939.3-702817.4 and J213939.3-702817.4) is a star, previously non-variable, found to be associated with an unusual, deep dimming event that was uncovered by the All Sky Automated Survey for SuperNovae (ASAS-SN) project, and first reported on 4 June 2019 in The Astronomer's Telegram. [2] [3] [4]
The star, in the constellation of Indus, about 3,630 ± 110 light-years (1,113 ± 33 pc) [3] [5] away, was first observed on 15 May 2014 (UT) by ASAS-SN, and, as of 4 June 2019, has resulted in more than 1780 data points, including a quiescent mean magnitude of g~12.95. [2] On 4 June 2019, the star was reported to have dimmed gradually from g~11.96 at HJD 2458635.78, to g~14.22 at 4458837.45, and, as of 4 June 2019, seems to be returning to its quiescent state of g~13.29 at HJD 2851634.89. [2] According to astronomer Tharindu Jayasinghe, one of the discoverers of the deep dimming event, "[The star has] been quiescent for so long and then suddenly decreased in brightness by a huge amount ... Why that happened, we don't know yet." [4]