COMET C/2017 S3 (PANSTARRS)變亮

[peter]

https://www.ast.cam.ac.uk/~jds/

[peter]

https://groups.yahoo.com/neo/groups/comets-ml/conversations/messages/27139  

C/2017 S3 (PANSTARRS) dramatically changed after outburst

 It becomes much diffuse and bigger quickly. Now it is not so easy object for 15-cm telescope as few days ago.

[peter]

TWITTER COMET

https://twitter.com/hashtag/comet

[peter]

https://twitter.com/vivstoitsis/status/1015514636349685761
Con Stoitsis

Comet C/2017 S3 Panstarrs has brightened to mag 9. Image from Jost Jahn only a few hours ago.

[peter]

https://groups.yahoo.com/neo/groups/comets-ml/conversations/messages/27149

 disintegration of a comet

disintegration  ??

[peter]

https://groups.yahoo.com/neo/groups/comets-ml/conversations/messages/27159

[peter]

https://www.skyandtelescope.com/observing/panstarrs-comet-rocked-by-outburst-now-binocular-bright/

[peter]

TWITTER

[peter]

https://cieloprofundo.net/2018/07/15/cometa-c-2017-s3-panstars-2/

[peter]

https://aboutspacejornal.net/2018/07/17/%D0%BA%D0%BE%D0%BC%D0%B5%D1%82%D0%B0-c-2017-s3-panstarrs-%D1%81%D0%B0%D0%BC%D0%B0%D1%8F-%D1%8F%D1%80%D0%BA%D0%B0%D1%8F-%D0%BD%D0%B0-%D0%B4%D0%B0%D0%BD%D0%BD%D1%8B%D0%B9-%D0%BC%D0%BE%D0%BC/

到目前為止，沒有證據表明它已解體  

在接下來的幾天裡，它的搜索參考對象  可以使用
   4 Cam（+5.3等星），5 Cam（+5.5等星），7 cam（+4.4 等）和Auriga三角洲（+3.7 等VHF）。

隨著彗星向南移向太陽，其能見度每天都在惡化

C / 2017 S3（PANSTARRS）將於2018年8月15日距離 太陽僅有0.21 AU
在近日點將比水星更接近 太陽
彗星能不能活下來還不知道

ISON  距離 太陽僅有  0.0124 AU 還不知  0.21 AU 會如何
池谷－關彗星 距離 太陽  0.007778 (B) AU

從7月31日至8月14日彗星應該是的在 STEREO SECCHI HI1-A的領域可見 （如不解體，足夠亮）。
並且從8月24日到9月13日在 coronagraph SOHO LASCO C3的視野中

[peter]

https://www.facebook.com/NBObservatories/posts/c-2017-s3-(panstarrs)-in/2053710494663811/

C/2017 S3 (PANSTARRS) in outburst, 30 days before perihelion

The outburst that started on July 15th is still developing. Last night, the comet was slightly brighter and a lot larger than the night before, approaching +8 mag with a coma diameter of about 8 arcminutes. The bright central condensation is still present, indicating that the nucleus is still intact. The thin tail is visible, but difficult due to star interference.
C/2017 S3 will reach perihelion on August 15th, at a distance of only 0.21 AU from the Sun. It is not expected to survive beyond perihelion.
The comet is now moving closer to the Sun in our sky. It will become unobservable in late July.

Photometry (APASS V magnitude unfiltered, 242" aperture radius): m1 = 8.5 +/- 0.1 mag
Nuclear magnitude (Gaia G magnitude unfiltered, 8" aperture radius): m2 = 12.3 +/- 0.1 mag
Bright central condensation, outer coma 8.1 arcminutes in diameter, circular
Larger and slightly brighter than on 16 July 2018
Thin tail 4.5 arcminutes long in PA 288° (interference from background star)
Comet altitude 26.1°

Measurement in ICQ format:
2017S3 2018 07 17.02 C 8.5 AQ 25.4Y 7A360 8.1 4.5m288 ICQ XX BAMaaI C 8.05mG2x ICY KPR 0 U9*0.09 2.1s 2.1

[peter]

FACEBOOK
Yu-Peng Chan

2018-07-18 18：00 (GMT+8)
0.4m Class Telescope 180s L


https://www.facebook.com/photo.php?fbid=2272089522816254&set=p.2272089522816254&type=3&theater

[曹大貓咪]

此彗星的離心率為1，屬於拋物線軌道！粉多大 彗星都屬於此類離心率…期待9月的夜空！

[peter]

https://groups.yahoo.com/neo/groups/CometObs/conversations/messages/7411

Juan Jose Gonzalez
Today at 4:49 AM
C/2017 S3 (PANSTARRS):
2018 July 17.98 UT: m1=7.3, Dia.=5', DC=6/ ... 10x50B ... Juan Jose Gonzalez ( Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W ) [ After new outburst. Morris method. In 25x100B : m1=7.4, Dia.=5', DC=6. In 20 cm SCT (77x) : m1=7.9, Dia.=4.5', DC=5/, Faint ion tail: 0.6 deg. in PA 300 deg, Sidgwick method. Tycho-2 comparison stars. SQM : 21.0.].

C/2018 N1 (NEOWISE):
2018 July 18.11 UT: m1=8.8, Dia.=12', DC=1/ ... 20 cm SCT (77x) ... Juan Jose Gonzalez ( Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W ) [ Mag. 11.0 (TK) star in coma. Altitude: 21 deg. Sidgwick method. Tycho-2 comparison stars. SQM : 21.0.].

21P/Giacobini-Zinner:
2018 July 18.04 UT: m1=9.9, Dia.=4', DC=4 ... 20 cm SCT (77x) ... Juan Jose Gonzalez ( Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W ) [ Sidgwick method. Tycho-2 comparison stars. SQM : 21.3.].

29P/Schwassmann-Wachmann:
2018 July 18.06 UT: m1=12.3, Dia.=2.5', DC=1/ ... 20 cm SCT (100x) ... Juan Jose Gonzalez ( Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W ) [ From dark mountain skies the comet shows a faint and very diffuse coma, remnant of previous outbursts. Field stars checked in DSS. Altitude: 38 deg. Sidgwick method. APASS comparison stars. SQM : 21.3.].

37P/Forbes:
2018 July 18.09 UT: m1=11.0, Dia.=4', DC=1/ ... 20 cm SCT (77x) ... Juan Jose Gonzalez ( Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W ) [ Sidgwick method. Tycho-2 comparison stars. SQM : 21.3.].

48P/Johnson:
2018 July 18.13 UT: m1=10.5, Dia.=5', DC=1/ ... 20 cm SCT (77x) ... Juan Jose Gonzalez ( Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W ) [ Faint outer coma. Sidgwick method. Tycho-2 comparison stars. SQM : 20.8.].

66P/du Toit:
2018 July 18.12 UT: m1=9.9, Dia.=4', DC=2 ... 20 cm SCT (77x) ... Juan Jose Gonzalez ( Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W ) [ Beginning of astronomical twilight. Altitude: 16 deg. Sidgwick method. Tycho-2 comparison stars. SQM : 21.0.].


( Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W;
  SQM 21.6 at zenith.).

[crux]

請問用The sky-x 要去那裡抓這顆彗星的軌道？