C/2019 Y4 ( ATLAS )ESA 太陽探測器將穿越彗星尾巴

[peter]

https://www.cloudynights.com/topic/696741-alpo-comet-news-for-march-2020/

C/2019 Y1 (ATLAS) was observed on March 15.11 UT. Not an easy detection due to low elevation (only 6 deg) and being located within the light dome of Tucson. Estimated it at mag 8.2 with a 2' coma and DC = 3.
 

C/2017 T2 (PANSTARRS) was an easy target on March 15.11 UT. Magnitude estimated at 8.4 with a 4' coma and DC = 5. Hard to tell with all of the interfering stars, but think I saw evidence of a tail.
 

C/2019 Y4 (ATLAS) was another easy target with a large coma of 9'. The comet appeared to have a very small condensed inner coma within a large diffuse outer coma (DC=4). Magnitude estimated at 8.4.

[peter]

https://www.cloudynights.com/topic/698073-comet-c-2019-y4-atlas/

[peter]

stellarium  sim

50mm and 35mm  + apsc DSLR

[peter]

5/23  ngc1499 跟本拍不到

[peter]

https://www.facebook.com/photo.php?fbid=1585363091615388&set=gm.1097048430465618&type=3&theater&ifg=1

Terry Lovejoy 

[peter]

https://www.facebook.com/photo.php?fbid=2524695561180509&set=gm.1097263507110777&type=3&theater&ifg=1

[peter]

https://www.facebook.com/photo.php?fbid=3658612690846389&set=gm.1100735343430260&type=3&theater&ifg=1

To understand the method used look at


https://arxiv.org/ftp/arxiv/papers/1608/1608.01243.pdf

[peter]

http://www.tam.museum/astronomy/astronomy_detail.php?lang=tw&id=851&fbclid=IwAR1BgHOFXHV5bE3_SldJ7cG8VhotZFdZKjKuKn2lV4Q5AND2MJNME_HO0dg 

這顆彗星是2019年12月由夏威夷小行星地面撞擊最後警報系統（ATLAS）發現的。天文學家很快意識到這可能是顆特別的彗星，ATLAS彗星將在2020年5月31日距離太陽0.25AU的水星軌道深處通過。如果它能在太陽能加熱的高溫中存活下來，就能上演一場精彩的演出。

然而，沒有人料到演出會這麼快就開始。離近日點（離太陽最近的地方）還有兩個多月，ATLAS彗星已經在升溫。全球彗星觀測資料庫顯示，它的亮度從2月初的+17等躍升到3月中旬的+8等，增加了4000倍。因此，可能會在4月初被肉眼觀察到。

Battams說：現在彗星正在釋放大量的冰凍揮發物（氣體），這就是為什麼它變亮得這麼快。

ATLAS能保持這種瘋狂的速度嗎？如果它有一個大的彗核和大量的冰凍氣體，那麼是有可能看到一顆非常明亮的彗星。否則，可能會耗盡氣體，在接近太陽時碎裂和變暗。

目前對5月彗星峰值亮度的最佳估計範圍是+1至-5等。如果ATLAS彗星到達該範圍的上限，將會比金星亮一點，可能在光天化日之下變得可見。然而，Battams直覺地對此感到不樂觀。

Battams說：從5月中旬到6月初，美國NASA的STEREO太陽探測衛星的日光層探測器（the Heliospheric Imager）將對ATLAS一覽無遺。探測器非常靈敏，因此也許能觀察到ATLAS的尾部與太陽風的相互作用，以及可能的分裂事件發生

[peter]

http://astrocometas.blogspot.com/

[peter]

https://www.facebook.com/photo.php?fbid=873420099737975&set=gm.1101355340034927&type=3&theater&ifg=1

[peter]

https://technews.tw/2020/03/24/atlas-c2019-y4-comet/

[peter]

https://skyandtelescope.org/astronomy-news/comet-atlas-will-it-become-a-naked-eye-object/?fbclid=IwAR323__Q5lN73YZl_J_XGBH6r7bTo2_2fuutdMnKoFP29Jf_XcZuVV1H3T0

[peter]

https://www.facebook.com/groups/watchcomet/

[peter]

http://scienceblogs.de/alpha-cephei/2020/03/30/c-2019-y4-atlas-kommt-jetzt-endlich-wieder-ein-grosser-komet/?utm_source=rss&utm_medium=rss&utm_campaign=c-2019-y4-atlas-kommt-jetzt-endlich-wieder-ein-grosser-komet

[peter]

https://www.facebook.com/140234731687/photos/a.155712931687/10156712226391688/?type=3&theater