asassn-v+j213939.3-702817.4 Latitude and Longitude:

Sky map 21h 39m 39.3s, −70° 28′ 17.4″
From Wikipedia, the free encyclopedia

ASASSN-V J213939.3-702817.4

Context star field of
ASASSN-V J213939.3-702817.4
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
Distance3630±110 [3]  ly
(1113±33 [3]  pc)
Absolute magnitude (MV)2.5 [2]
Details
Temperature6800±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]

See also

References

  1. ^ Staff (2 August 2008). "Finding the constellation which contains given sky coordinates". DJM.cc. Retrieved 8 June 2019.
  2. ^ a b c d e f Jayasinghe, T.; et al. (4 June 2019). "ASAS-SN Discovery of an Unusual, Deep Dimming Episode of a Previously Non-Variable Star". The Astronomer's Telegram. Retrieved 8 June 2019.
  3. ^ a b c d e f McCollum, B.; Laine, S. (8 June 2019). "Spectral Type of the Unusual Variable ASASSN-V J213939.3-702817.4". The Astronomer's Telegram. Retrieved 8 June 2019.
  4. ^ a b Seidel, Jamie (6 June 2019). "A suddenly dimming star has caught the attention of alien hunters". The Advertiser. Retrieved 8 June 2019.
  5. ^ Gilster, Paul (5 June 2019). "HD 163296: Emerging Insights into Circumstellar Disks - Comment (Harry R Ray on 5 June 2019, 9:56)". Centauri-Dreams.org. Retrieved 8 June 2019.

External links



asassn-v+j213939.3-702817.4 Latitude and Longitude:

Sky map 21h 39m 39.3s, −70° 28′ 17.4″
From Wikipedia, the free encyclopedia

ASASSN-V J213939.3-702817.4

Context star field of
ASASSN-V J213939.3-702817.4
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
Distance3630±110 [3]  ly
(1113±33 [3]  pc)
Absolute magnitude (MV)2.5 [2]
Details
Temperature6800±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]

See also

References

  1. ^ Staff (2 August 2008). "Finding the constellation which contains given sky coordinates". DJM.cc. Retrieved 8 June 2019.
  2. ^ a b c d e f Jayasinghe, T.; et al. (4 June 2019). "ASAS-SN Discovery of an Unusual, Deep Dimming Episode of a Previously Non-Variable Star". The Astronomer's Telegram. Retrieved 8 June 2019.
  3. ^ a b c d e f McCollum, B.; Laine, S. (8 June 2019). "Spectral Type of the Unusual Variable ASASSN-V J213939.3-702817.4". The Astronomer's Telegram. Retrieved 8 June 2019.
  4. ^ a b Seidel, Jamie (6 June 2019). "A suddenly dimming star has caught the attention of alien hunters". The Advertiser. Retrieved 8 June 2019.
  5. ^ Gilster, Paul (5 June 2019). "HD 163296: Emerging Insights into Circumstellar Disks - Comment (Harry R Ray on 5 June 2019, 9:56)". Centauri-Dreams.org. Retrieved 8 June 2019.

External links



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