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APOD: Messier 10 and Comet (2022 Jul 21)
Posted: Thu Jul 21, 2022 4:05 am
by APOD Robot
Messier 10 and Comet
Explanation: Imaged on July 15 2022,
comet C/2017 K2 (PanSTARRS) had a
Messier moment, sharing this wide telescopic field of view with globular star cluster Messier 10. Of course M10 was cataloged by 18th century comet hunter Charles Messier as the 10th object on his list of things that were definitely not comets.
While M10 is about 14 thousand light-years distant, this comet PanSTARRS was about 15 light-minutes from our fair planet following its its July 14 closest approach.
Its greenish coma and dust tail entertaining 21st century comet watchers, C/2017 K2 is expected to remain a fine telescopic comet in
northern summer skies. On a maiden voyage from our Solar System's remote
Oort Cloud this comet PanSTARRS was discovered in May 2017 when it was beyond the orbit of Saturn. At the time that made it the most
distant active inbound comet known. Its closest approach the Sun will be within 1.8
astronomical units on December 19, beyond the orbital distance of Mars.
Re: APOD: Messier 10 and Comet (2022 Jul 21)
Posted: Thu Jul 21, 2022 4:22 am
by jks
Hi,
At its closest approach to Earth, the comet was at a distance of 15 light-minutes (not 15 light-seconds), right?
Re: APOD: Messier 10 and Comet (2022 Jul 21)
Posted: Thu Jul 21, 2022 4:25 am
by Ann
jks wrote: ↑Thu Jul 21, 2022 4:22 am
Hi,
At its closest approach to Earth, the comet was at a distance of 15 light-minutes (not 15 light-seconds), right?
You must be absolutely right about that!
Ann
Re: APOD: Messier 10 and Comet (2022 Jul 21)
Posted: Thu Jul 21, 2022 4:28 am
by jks
Thanks Ann, I was wondering if there was something that I was missing.
![:) :ssmile:](./images/smilies/smile.gif)
Re: APOD: Messier 10 and Comet (2022 Jul 21)
Posted: Thu Jul 21, 2022 6:19 am
by daddyo
Have stereo viewing images been made before of a comet in two adjacent positions in time? I wonder what could look like.
Re: APOD: Messier 10 and Comet (2022 Jul 21)
Posted: Thu Jul 21, 2022 10:25 am
by De58te
jks wrote: ↑Thu Jul 21, 2022 4:22 am
Hi,
At its closest approach to Earth, the comet was at a distance of 15 light-minutes (not 15 light-seconds), right?
I believe you're right. If I recall a light second is approximately 300,000 kilometers. For easy calculation. From the Wikipedia article on PanStarrs; "and then on 14 July 2022, it passed 1.8 AU (270 million km) from Earth." Now, 270 million km would be about 900 light seconds. (270 divided by 0.3) And 900 seconds equals 15 minutes. They've actually changed the description at the top to minutes although the main web page still reads 15 seconds.
Re: APOD: Messier 10 and Comet (2022 Jul 21)
Posted: Thu Jul 21, 2022 1:13 pm
by orin stepanek
"Every day; it's a getting closer"
![Cool 8-)](./images/smilies/icon_cool.gif)
! Do you suppose this may turn
out to be an OMG view of a comet? 'It would be nice!
![Mr. Green :mrgreen:](./images/smilies/icon_mrgreen.gif)
Re: APOD: Messier 10 and Comet (2022 Jul 21)
Posted: Thu Jul 21, 2022 2:45 pm
by johnnydeep
APOD Robot wrote: ↑Thu Jul 21, 2022 4:05 am
Messier 10 and Comet
Explanation: Imaged on July 15 2022,
comet C/2017 K2 (PanSTARRS) had a
Messier moment, sharing this wide telescopic field of view with globular star cluster Messier 10. Of course M10 was cataloged by 18th century comet hunter Charles Messier as the 10th object on his list of things that were definitely not comets.
While M10 is about 14 thousand light-years distant, this comet PanSTARRS was about 15 light-minutes from our fair planet following its its July 14 closest approach.
Its greenish coma and dust tail entertaining 21st century comet watchers, C/2017 K2 is expected to remain a fine telescopic comet in
northern summer skies. On a maiden voyage from our Solar System's remote
Oort Cloud this comet PanSTARRS was discovered in May 2017 when it was beyond the orbit of Saturn. At the time that made it the most
distant active inbound comet known. Its closest approach the Sun will be within 1.8
astronomical units on December 19, beyond the orbital distance of Mars.
Ah, "
this comet PanSTARRS was discovered in May 2017" - because, of course the PanSTARRS project has discovered a few
other comets as well. From
https://en.wikipedia.org/wiki/List_of_P ... iscoveries
Re: APOD: Messier 10 and Comet (2022 Jul 21)
Posted: Thu Jul 21, 2022 11:07 pm
by Fred the Cat
Keeping track of comets these days is a little less
messy.
![Wink :wink:](./images/smilies/icon_wink.gif)