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| {{short description|Astronomical radio source discovered by the SETI@home project (March 2003)}} | |||
| {{wrongtitle|title=Radio source SHGb02+14a}} | |||
| '''SHGb02+14a''' is an ] and a candidate in the ], discovered in March 2003 by ] and announced in '']'' on September 1, 2004.<ref name="NewSci">{{cite news |publisher = ] |title = Mysterious signals from light years away |url = https://www.newscientist.com/article/dn6341-mysterious-signals-from-light-years-away/ |last = Reich |first = Euginie |date = 2004-09-01 |access-date = 2006-06-12 }}</ref> | |||
| ==Observation== | |||
| '''SHGb02+14a''' is an interesting radio source and candidate in the ] discovered on March ] by ] and announced in '']'' on ], ]. This weak source was observed three times at 1420 ] and emitted from between the constellations ] and ]. According to the '']'', the 1420 MHz ] would be one that extraterrestrials would use, since it is one of the main frequencies at which ], readily absorbs and radiates energy. | |||
| The source was originally detected by Oliver Voelker of Logpoint in Nuremberg, Germany and Nate Collins of Farin and Associates in Wisconsin, USA using the giant ] in Puerto Rico. It was observed three times (for a total of about one minute) at a ] of about 1420 ],<ref name="NewSci"/><ref name="BBC">{{cite news |publisher = ] |url = http://news.bbc.co.uk/1/hi/sci/tech/3621608.stm |title = Astronomers deny ET signal report |date = 2004-09-02 |first = David |last = Whitehouse |access-date = 2006-06-12 }}</ref> one of the frequencies in the ] region, which is theorized to be a good candidate for frequencies used by ] to broadcast contact signals. | |||
| There are a number of puzzling features of this candidate, which have led to a large amount of skepticism.<ref name="Alexander">{{cite news |publisher = ] |title = SETI@home Leaders Deny Reports of Likely Extraterrestrial Signal |url = http://planetary.org/news/2004/0902_SETIhome_Leaders_Deny_Reports_of.html |date = 2004-09-02 |last = Alexander |first = Amir |access-date = 2006-06-12 |archive-url = https://web.archive.org/web/20110726074250/http://planetary.org/news/2004/0902_SETIhome_Leaders_Deny_Reports_of.html |archive-date = 2011-07-26 }}</ref> The source is located between the ]s ] and ], a direction in which no ]s are observed within 1000 ]s from ]. It is also a very weak signal. The frequency of the signal has a rapid ], changing by between 8 and 37 hertz per second.<ref name="NewSci"/> If the cause is ], it would indicate emission from a ] rotating nearly 40 times faster on its axis than the Earth. Each time the signal was detected, it was again at about 1420 MHz, the original frequency before any drift. | |||
| There has been more skepticism than a welcoming to the event. Most researchers dismissed the signal as an artifact of random chance, cosmic noise or maybe just a glitch in the technology. | |||
| There are a number of potential explanations for this signal. ] has denied media reports of a likely extraterrestrial intelligence signal.<ref name="BBC"/><ref name="Alexander"/> It could be an artifact of random chance, ] or even a glitch in the technology.<ref>{{cite book |last1=Schulze-Makuch |first1=Dirk |last2=Irwin |first2=Louis N. |title=Life in the Universe: Expectations and Constraints |edition=3rd |year=2018 |publisher=Springer |page=269 |isbn=978-3-319-97658-7 }}</ref> | |||
| Another reason for the skepticism is that there is no ] within 1000 ]s of that direction. | |||
| ===Star field=== | |||
| Some of the most explicit arguements were edited by the * article. It argues that ''] is just a ] with an electron in its ]; both the ] and the ] have a ] ] moment. There is a tiny ] difference between alignment and anti-alignment, and when the system flips, you get a tiny ] at 1420 MHz (a wavelength of 21 cm, hence the ]). There's a lot of neutral ] in the ] and therefore there is a lot of ] at 1420 MHz. It was one of the first detections made when we invented ].'' | |||
| The region is unusually devoid of any nearby stars. The closest star systems in the approximate region of the signal include the binary star G 73-11A and B, which are 106.1 ]s from the Sun, although the unrelated star G 73-10 is only 108.7 light-years away, less than three light-years from G 73-11A and B. All of these stars are ]s much less massive than the Sun.<ref>{{Cite DR2}}</ref> The much nearer star, ], which is one of the nearest 40 stars to the Sun, is near the signal's position, but its proximity is likely coincidental. | |||
| It adds that ''there are some more oddities to the signal. In the three times it has been detected, it has ] shifted quite rapidly. This is presumably due to the motion of the source itself relative to us. A shift of 37 Hz per second (the maximum observed) would mean that the source was accelerating at around 8 meters/second^2. If the civilization was sending out a signal from a home planet in ] around the Sun, this would imply a pretty rapid rate of rotation. The Earth's acceleration about the Sun is much less.'' | |||
| == See also == | |||
| In the same article, Simon argues that ''Another oddity about this signal is that it lasts around a minute or so. This implies that the region that it came from was less than a light-minute in size. This is very unusual, since the ] emission is usually very faint, and requires a large amount of material spread out over much larger scales. I don't know the amplitude of the signal, but from what I understand, one light-minute (less than the size of the Earth's radius of orbit) is a fantastically tiny region to get a significant amount of 21 cm emission from. More indeed, the fact that signals never lasted longer than a minute which makes it difficult to analize them.'' | |||
| * ] | |||
| * ] | |||
| == References and notes == | |||
| A more skeptical article concerning the discovery was written by ]. | |||
| {{Reflist}} | |||
| ⚫ | == External links == | ||
| However the controversy over the SHGb02+14a, it is still an interesting signal. So the search continues. | |||
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| * SETI@home (classic)'s | |||
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| {{Extraterrestrial life}} | |||
| {{DEFAULTSORT:Shgb02+14a}} | |||
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| ⚫ | ==External links== | ||
| ⚫ | ] | ||
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Latest revision as of 20:05, 13 October 2023
Astronomical radio source discovered by the SETI@home project (March 2003)SHGb02+14a is an astronomical radio source and a candidate in the Search for Extra-Terrestrial Intelligence (SETI), discovered in March 2003 by SETI@home and announced in New Scientist on September 1, 2004.
Observation
The source was originally detected by Oliver Voelker of Logpoint in Nuremberg, Germany and Nate Collins of Farin and Associates in Wisconsin, USA using the giant Arecibo Telescope in Puerto Rico. It was observed three times (for a total of about one minute) at a frequency of about 1420 MHz, one of the frequencies in the waterhole region, which is theorized to be a good candidate for frequencies used by extraterrestrial intelligence to broadcast contact signals.
There are a number of puzzling features of this candidate, which have led to a large amount of skepticism. The source is located between the constellations Pisces and Aries, a direction in which no stars are observed within 1000 light years from Earth. It is also a very weak signal. The frequency of the signal has a rapid drift, changing by between 8 and 37 hertz per second. If the cause is Doppler shift, it would indicate emission from a planet rotating nearly 40 times faster on its axis than the Earth. Each time the signal was detected, it was again at about 1420 MHz, the original frequency before any drift.
There are a number of potential explanations for this signal. SETI@home has denied media reports of a likely extraterrestrial intelligence signal. It could be an artifact of random chance, cosmic noise or even a glitch in the technology.
Star field
The region is unusually devoid of any nearby stars. The closest star systems in the approximate region of the signal include the binary star G 73-11A and B, which are 106.1 light-years from the Sun, although the unrelated star G 73-10 is only 108.7 light-years away, less than three light-years from G 73-11A and B. All of these stars are red dwarfs much less massive than the Sun. The much nearer star, L 1159-16, which is one of the nearest 40 stars to the Sun, is near the signal's position, but its proximity is likely coincidental.
See also
References and notes
- ^ Reich, Euginie (2004-09-01). "Mysterious signals from light years away". New Scientist. Retrieved 2006-06-12.
- ^ Whitehouse, David (2004-09-02). "Astronomers deny ET signal report". BBC News. Retrieved 2006-06-12.
- ^ Alexander, Amir (2004-09-02). "SETI@home Leaders Deny Reports of Likely Extraterrestrial Signal". The Planetary Society. Archived from the original on 2011-07-26. Retrieved 2006-06-12.
- Schulze-Makuch, Dirk; Irwin, Louis N. (2018). Life in the Universe: Expectations and Constraints (3rd ed.). Springer. p. 269. ISBN 978-3-319-97658-7.
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
External links
- Signal Candidate SHGb02+14a
- SETI@home (classic)'s Best Gaussians
- SETI range calculator