astro.wikisort.org - StarVVV-WIT-07 is a unique variable star which presents a sequence of recurrent dimmings (Ks~14.35 – 16.164)[1] with a possible deep eclipse in July 2012. The star, located in the Scorpius constellation about 23,000 ly (7,100 pc)[citation needed] away,[1] is not a binary star, which would eliminate such a system from explaining the various observed dimmings.[3]
Star noted for unusual dimming events
VVV-WIT-07
 Context star field of VVV-WIT-07 |
Observation data Epoch J2000 Equinox J2000 |
Constellation |
Scorpius |
Right ascension |
17h 26m 29.387s[1] |
Declination |
−35° 40′ 56.20″[1] |
Characteristics |
Astrometry |
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Proper motion (μ) | RA: 2.469[1] mas/yr Dec.: 1.374[1] mas/yr |
Parallax (π) | 2.5190 ± 1.1187 mas[2] |
Distance | approx. 1,300 ly (approx. 400 pc) |
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Details |
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Other designations |
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Gaia DR2 5974962995291907584 [1] |
Database references |
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SIMBAD | data |
Overview
The star was found by the "Vista Variables in the Via Lactea" (VVV) project, which is a survey of European Southern Observatory (ESO) variability of the innermost bulge of the Milky Way galaxy. The near-infrared spectra of VVV-WIT-07 appear without features, without prominent emission or absorption lines. The characteristics found in the light curve of VVV-WIT-07 (WIT refers to "What Is This?") are similar to those seen in J1407 (Mamajek's Object), a pre-MS K5 dwarf with a ring system that eclipses the star or, alternatively, to Tabby's star, an F3 IV/V star that shows irregular and aperiodic obscurations in its light curve.[1][4][5][6][7][8][3]
From 2010 to 2018, the star dimmed and brightened irregularly (v~14.35 – 16.164),[1] and seemed similar to Tabby's star, except the light from VVV-WIT-07 dimmed by up to 80 percent, while Tabby’s star faded by only about 20 percent.[8] Another star, J1407, however, has been found to have dimmed by up to 95%, which may be more similar to the light curve presented by VVV-WIT-07.[8] Nonetheless, according to ESO astronomer Valentin Ivanov, "A key word that could be used to describe our finding [of VVV-WIT-07] is extreme. In every aspect ... We have identified a system that challenges the imagination even more than usual, because it is so unlike our own planetary system."[3]
See also
References
- Saito, Roberto K.; et al. (2019). "VVV-WIT-07: another Boyajian's star or a Mamajek's object?". Monthly Notices of the Royal Astronomical Society. 482 (4): 5000–5006. arXiv:1811.02265. Bibcode:2019MNRAS.482.5000S. doi:10.1093/mnras/sty3004. S2CID 119068259.
- Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
- Ivanov, Valentin D. (22 March 2019). "What Is This? - Astronomers discover mysterious star displaying never-seen-before behaviour". European Southern Observatory. Retrieved 9 June 2019.
- Saito, R.K.; et al. (6 November 2018). "VVV-WIT-07: another Boyajian's star or a Mamajek's object?". Monthly Notices of the Royal Astronomical Society. 482 (4): 5000–5006. arXiv:1811.02265. doi:10.1093/mnras/sty3004. S2CID 119068259.
- Seidel, Jamie (23 November 2018). "VVV-WIT-07: This ancient, erratic star hides a dark secret". The Advertiser. Retrieved 8 June 2019.
- Anderson, Paul Scott (29 November 2018). "Have astronomers found another Tabby's Star? - Remember when astronomers found Tabby's Star and said they'd never seen anything like it? Now there's another one … maybe". Earth & Sky. Retrieved 8 June 2019.
- Redd, Nola Taylor (21 November 2018). "Have Astronomers Found Another "Alien Megastructure" Star? - Scientists now have a second example of a strange stellar phenomenon speculatively linked to extraterrestrial intelligence in 2015". Scientific American. Retrieved 8 June 2019.
- Grossman, Lisa (22 December 2018). "Astronomers spot another star that flickers like Tabby's star - It's unclear what's causing the newly discovered object to blink, but it's probably not aliens". Science News. Vol. 194, no. 12. p. 9. Retrieved 8 June 2019.
External links
Constellation of Scorpius |
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Stars | |
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Star clusters | |
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Nebulae | |
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Galaxies | |
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 Category |
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Events and objects | |
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Signals of interest | Misidentified |
- CP 1919 (misidentified pulsar)
- CTA-102 (misidentified quasar)
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Stars | |
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Other |
- SHGb02+14a (radio source)
- Wow! signal (inconclusive)
- Fast radio burst (unknown origin)
- BLC1 (radio signal)
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Life in the Universe |
- Earliest known life forms
- Habitability of Enceladus
- Habitability of Europa
- Habitability of Mars
- Habitability of Titan
- Habitability of Venus
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Planetary habitability | |
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Space missions |
- Beagle 2
- Biological Oxidant and Life Detection
- BioSentinel
- Curiosity rover
- Darwin
- Dragonfly
- Enceladus Explorer
- Enceladus Life Finder
- Europa Clipper
- ExoMars
- ExoLance
- EXPOSE
- Foton-M3
- Icebreaker Life
- Journey to Enceladus and Titan
- Laplace-P
- Life Investigation For Enceladus
- Living Interplanetary Flight Experiment
- Mars Geyser Hopper
- Mars sample-return mission
- Mars 2020
- Northern Light
- Opportunity rover
- SpaceX Red Dragon
- Spirit rover
- Tanpopo
- Titan Mare Explorer
- Venus In Situ Explorer
- Viking 1
- Viking 2
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Interstellar communication |
- Active SETI
- Allen Telescope Array
- Arecibo message
- Arecibo Observatory
- Berkeley SETI Research Center
- Bracewell probe
- Breakthrough Initiatives
- Breakthrough Listen
- Breakthrough Message
- Communication with extraterrestrial intelligence
- Gauss's Pythagorean right triangle proposal
- Astrolinguistics
- Lincos language
- NIROSETI
- Pioneer plaque
- Project Cyclops
- Project Ozma
- Project Phoenix
- SERENDIP
- Search for extraterrestrial intelligence
- SETI@home
- setiQuest
- Voyager Golden Record
- Water hole
- Xenolinguistics
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Exhibitions | |
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Hypotheses |
- Aestivation hypothesis
- Ancient astronauts
- Cosmic pluralism
- Directed panspermia
- Drake equation
- Extraterrestrial hypothesis
- Fermi paradox
- Great Filter
- Hypothetical types of biochemistry
- Interplanetary contamination
- Kardashev scale
- Mediocrity principle
- Neocatastrophism
- Panspermia
- Planetarium hypothesis
- Rare Earth hypothesis
- Zoo hypothesis
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Related topics |
- Astrobiology
- Astroecology
- Biosignature
- Brookings Report
- Planetary protection
- Potential cultural impact of extraterrestrial contact
- Post-detection policy
- Exotheology
- Extraterrestrials in fiction
- Extremophile
- MERMOZ
- Nexus for Exoplanet System Science
- Noogenesis
- San Marino Scale
- Technosignature
- UFO religion
- Xenoarchaeology
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