Comet C/2017 S3 (PANSTARRS)

[PepeChambo]

Image of comet C/2017 S3 (PANSTARRS) taken during an outburst that happened at the beginning of July 2018, in wich its brightness increased from magnitude 12 to 9 meanwhile its coma expanded so from 2.5 to 5 arcminutes of appearent size (nearly from 150.000 to 300.000 Km. real diameter). The intense greenish tone of coma suggest that major part of emitted material is about C2 gas (diatomic carbon).

Telescope GSO 8" N f/3.8 & Camera Atik 383L+.
14.5 min. total exposure. Non-composite stacking.
Locally from Vallés, Valencia (Spain).

http://cometografia.es/2017s3-panstarrs-20180705/

[Ceramus]

Nice image, it will probably not survive perihelion?

[happy-kat]

Lovely intense colour.

[PepeChambo]

2 hours ago, Ceramus said:

Nice image, it will probably not survive perihelion?

No, in fact some people think is disintegrating now.

[PepeChambo]

Comet C/2017 S3 (PANSTARRS) photographed on July 9th 2018, a week after its first outburst of activity has dropped from magnitude 9 to 10.5 with a coma which has reduced again its size from 5 to 3 arcseconds in appearent diameter. In the upper part of the image highlights "Tombaugh 5", a little-known open cluster of faint 12 magnitude stars.

Telescope GSO 8" N f/3.8 & Camera Atik 383L+.
14.5 min. total exposure. Non-composite stacking.
Locally from Vallés, Valencia (Spain).

http://cometografia.es/2017s3-panstarrs-20180709/

[PepeChambo]

Image of comet C/2017 S3 (PANSTARRS) on July 15th 2018, photographed just when was happening a second outburst and increasing suddenly its brightness from magnitude 10.5 to 8. If we compares with the image I took on day 9th we will see its coma extended the size from 3' to 4', but mainly changed its appearance much more condensed and contrasted wich reveal recent gas emission still in expansion phase. On the other hand, begins to be appreciable the developing of a ionic tail toward northwest, although appears faint and short in this image.

Telescope GSO 8" N f/3.8 & Camera Atik 383L+.
9 min. total exposure. Non-composite stacking.
Locally from Hoya Redonda, Valencia (Spain).

http://cometografia.es/2017s3-panstarrs-20180715/

[PepeChambo]

Comet C/2017 S3 (PANSTARRS) photographed on July 19th 2018, after a second outburst of activity, increased its brightness until magnitude 7 and expanding its greenish coma until a apparent diameter of 8', being observable through binoculars in the sky before dawn and developing a ionic tail which in this image is perceived with at least half degree lenght.

Telescope GSO 8" N f/3.8 & Camera Atik 383L+.
11 min. total exposure. Non-composite stacking.
Locally from Vallés, Valencia (Spain).

http://cometografia.es/2017s3-panstarrs-20180719/

[Davey-T]

Another beauty Jose, I hope to catch it soon, maybe tonight if the cloud stays away.

Dave

[PepeChambo]

On 23/07/2018 at 18:27, Davey-T said:

Another beauty Jose, I hope to catch it soon, maybe tonight if the cloud stays away.

Dave

Good luck Dave, opportunities ends, comet be unobservable soon and probably disintegrating on next days at approaching to Sun.

This is my last image:
 
...

Comet C/2017 S3 (PANSTARRS) photographed on July 20th 218, after a pair of outbursts developed a ionic tail during some days, but this one weaken fast. In this image the tail had already started to vanish, although still is appreciable some structural detail in it.

Telescope Planewave 20" CDK f/4.5 & Camera FLI PL11002M.
Mosaic of 2 tiles, 9 min. each. Non-composite stacking.
Remotely from Mayhill, New Mexico (USA).

http://cometografia.es/2017s3-panstarrs-20180720/

[Davey-T]

4 minutes ago, PepeChambo said:

Good luck Dave, opportunities ends, comet be unobservable soon and probably disintegrating on next days at approaching to Sun.

Thanks Jose, I managed to a few subs of it last night so at least I have a record.

Dave

[Pete Presland]

Very interesting to see the difference in the images over a short period of time.