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[td][/td]Revision as of 16:39, 3 September 2025
[/td][td][/td] [td]== Observability ==[/td]
[td]== Observability ==[/td] [td]3I/ATLAS is a faint comet that is not expected to get brighter than about [[apparent magnitude]] 11.5 from Earth.<ref name="Yoshida"/> Even at its peak brightness, the comet will not be visible to an observer on Earth using the [[naked eye]]<ref name="SETI"/> or to an average observer with a pair of 50 mm [[binoculars]].<ref name="binoculars">{{cite web |date=2004 |title=Limiting Magnitude in Binoculars |publisher=Cloudy Nights |first=Ed |last=Zarenski |url=http://www.cloudynights.com/documents/limiting.pdf |access-date=6 July 2025 |archive-date=21 July 2011 |archive-url=https://web.archive.org/web/20110721072103/http://www.cloudynights.com/documents/limiting.pdf |url-status=live }}</ref> 3I/ATLAS has been imaged by [[astrometric solving|plate-solving]] [[Robotic telescope#Smart telescopes|smart telescopes]] with an [[aperture]] diameter of at least {{cvt|3 to 4.5|in|cm}}.<ref name="SETI"/> {{Asof|2025|09}}, 3I/ATLAS has an total magnitude (nucleus+coma) of 15.5 which makes it currently about 100 times fainter than comet [[C/2025 A6 (Lemmon)]].<ref name="cobs"/>[/td]
[td]3I/ATLAS is a faint comet that is not expected to get brighter than about [[apparent magnitude]] 11.5 from Earth.<ref name="Yoshida"/> Even at its peak brightness, the comet will not be visible to an observer on Earth using the [[naked eye]]<ref name="SETI"/> or to an average observer with a pair of 50 mm [[binoculars]].<ref name="binoculars">{{cite web |date=2004 |title=Limiting Magnitude in Binoculars |publisher=Cloudy Nights |first=Ed |last=Zarenski |url=http://www.cloudynights.com/documents/limiting.pdf |access-date=6 July 2025 |archive-date=21 July 2011 |archive-url=https://web.archive.org/web/20110721072103/http://www.cloudynights.com/documents/limiting.pdf |url-status=live }}</ref> 3I/ATLAS has been imaged by [[astrometric solving|plate-solving]] [[Robotic telescope#Smart telescopes|smart telescopes]] with an [[aperture]] diameter of at least {{cvt|3 to 4.5|in|cm}}.<ref name="SETI"/> {{Asof|2025|09}}, 3I/ATLAS has a total magnitude (nucleus+coma) of 15.5 which makes it currently about 100 times fainter than comet [[C/2025 A6 (Lemmon)]].<ref name="cobs"/>[/td] [td][/td]
[td][/td] [td]From July to September 2025, 3I/ATLAS is observable from Earth after sunset.<ref name="TheSkyLive"/> During the first half of July 2025, 3I/ATLAS was located in the [[constellation]] [[Sagittarius (constellation)|Sagittarius]] at an apparent magnitude of 17.5.<ref name="TheSkyLive"/> By the second half of July 2025, 3I/ATLAS had moved to the constellation [[Ophiuchus]] and had brightened to apparent magnitude 16.<ref name="TheSkyLive"/> During that time, the comet was located in a region of the sky where it was densely filled with stars, which made observations challenging as the comet could overlap background stars.<ref name="TheSkyLive"/> The comet will continue brightening as it approaches the Sun, and throughout August 2025 it will move across the constellations Ophiuchus, [[Scorpius (constellation)|Scorpius]], and [[Libra (constellation)|Libra]].<ref name="TheSkyLive"/> During September 2025, 3I/ATLAS will remain in the constellation Libra as it brightens from apparent magnitude 14 to 11.7.<ref name="TheSkyLive"/>[/td]
[td]From July to September 2025, 3I/ATLAS is observable from Earth after sunset.<ref name="TheSkyLive"/> During the first half of July 2025, 3I/ATLAS was located in the [[constellation]] [[Sagittarius (constellation)|Sagittarius]] at an apparent magnitude of 17.5.<ref name="TheSkyLive"/> By the second half of July 2025, 3I/ATLAS had moved to the constellation [[Ophiuchus]] and had brightened to apparent magnitude 16.<ref name="TheSkyLive"/> During that time, the comet was located in a region of the sky where it was densely filled with stars, which made observations challenging as the comet could overlap background stars.<ref name="TheSkyLive"/> The comet will continue brightening as it approaches the Sun, and throughout August 2025 it will move across the constellations Ophiuchus, [[Scorpius (constellation)|Scorpius]], and [[Libra (constellation)|Libra]].<ref name="TheSkyLive"/> During September 2025, 3I/ATLAS will remain in the constellation Libra as it brightens from apparent magnitude 14 to 11.7.<ref name="TheSkyLive"/>[/td] [td]|url = https://www.cobs.si[/td]
[td]|url = https://www.cobs.si[/td] [td]|publisher = Crni Vrh Observatory[/td]
[td]|publisher = Crni Vrh Observatory[/td] [td]|accessdate = 3 September 2025 }}</ref>[/td]
[td]|accessdate = 3 September 2025 }} (3Iβ15.5 and 25A6β10.2)</ref>[/td] [td][/td]
[td][/td] [td]<ref name="Plait-Jul2025">{{cite news[/td]
[td]<ref name="Plait-Jul2025">{{cite news[/td]
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