親子觀星會

C/2026 A1 (MAPS)彗星的彗核可能只有約400公尺大小

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https://hdr-astrophotography.com/?fbclid=IwdGRjcAP7t_9jbGNrA_u3_GV4dG4DYWVtAjExAHNydGMGYXBwX2lkDDM1MDY4NTUzMTcyOAABHliDs17uCr8olPvOuW-XaEZ7QH7Z2yHcsl0S45ocD5hussGCqVYhX1M3Sckw_aem_oedXk_kF1UkJi3qq-cnMHw


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C/2026 A1(MAPS) 6AC4721  新 Kreutz 彗星

https://astro.vanbuitenen.nl/comet/2026A1


http://www.aerith.net/comet/catalog/2026A1/2026A1.html



Great news, well done MAPS
New comet C/2026 A1 (MAPS)
First report was by A. Maury on 2026-Jan-13 at magnitude 17.8 from station W84, MAPS, San Pedro de Atacama. Many have confirmed comet activity of coma and short tail.
The orbit is of a Kreutz sungrazer:
perihelion distance q   0.0054587 au or 1.17 solar radii
perihelion date T 2026 Apr. 4.56415
inclination 144.5 deg (retrograde)
Currently comet C/2026 A1 (MAPS) is 18th to 19th magnitude in Caelum moving slowly northward.
The MAPS program began in 2020.
MAPS stands for Maury, Attard, Parrott, and Signoret, i.e.
    Alain Maury
    Georges Attardd
    Daniel Parrott,
    Florian Signoret
Reference: MPEC 2026-B129 : COMET C/2026 A1 (MAPS)
C/2026 A1 (MAPS)
近日点通過が2026 Apr. 4.56415
近日点Perihelion 距離が0.0054587 au

ISON         近日 0.01244 AU
1965s1 池谷關  近日 0.0077AU

=
C/2026 A1 6AC4721 近日點 2026 年 4 月 4.464440


Discovery highlights:⁠
• Discovered from San Pedro de Atacama (Chile) at the AMACS1 Observatory using a 0.28 m (11") f/2.2 Schmidt + CCD⁠
• Found at 2.056 AU from the Sun and 1.433 AU from Earth — reportedly the farthest distance at which a Kreutz sungrazer has ever been discovered⁠
• About mag 17.8 at discovery, in the constellation Columba⁠
 

 比彗星 Lovejoy   brighter than C/2011 W3 Lovejoy

https://www.reddit.com/r/spaceporn/comments/1qcv4ib/new_kreutz_comet_discovered_yesterday_could_be/?tl=zh-hant

WIKI


https://en.wikipedia.org/wiki/6AC4721

 This comet was discovered through the MAPS program, which were led by Alain Maury, Georges Attard and Florian Signoret

MAPS => https://familystar.org.tw/index.php?option=com_smf&Itemid=45&topic=40702.0

https://astronomynow.com/2026/01/16/potentially-bright-sungrazing-comet-discovered/

Two, is how far out it was when it was discovered, a distance of 2.056 AU (191.1 million mi; 307.6 million km) from our home star and 1.433 AU (133.2 million mi; 214.4 million km) from our Earth. A Kreutz Sungrazer comet has never been discovered this far from our home star before, indicating that this is a large comet.
As of last night, January 17, 2026, initial orbital simulations show this comet getting as close as 0.021 AU from our star on April 4, 2026.
By the end of this week, more information about this comet will be known and I will be posting about that, especially how bright it will get and IF and when we will be able to see it from our location.

https://www.facebook.com/photo/?fbid=10236738114246164&set=pcb.10236738062884880

https://www.facebook.com/reel/2975827085950674

https://www.spaceobs.com/en/Alain-Maury-s-Blog/The-discovery-of-new-comet-6AC4721?fbclid=IwY2xjawPbrjtleHRuA2FlbQIxMABicmlkETE1aEpFc0RxaGdEU1hoR1Z3c3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHrmdEI3IpOLt0P37ppQ8o89uqNOX9zW-lFxvnEO7ZqasIbdIeD8Ezybv28Vt_aem_eQfm6EnlmhRQBnj-_iLNtQ

https://tam.gov.taipei/News_Content.aspx?n=EF86D8AF23B9A85B&sms=F32C4FF0AC5C2801&s=FC0A4D7225627468 

這顆1月13日發現的新彗星已被列入國際天文聯合會小行星中心的「疑似彗星」頁面。目前暫定編號為6AC4721，一旦被確認為彗星，將會獲得正式編號。目前影像顯示它擁有彌散的彗髮和一條短小的彗尾，因此預計它很快就會被確認，其正式編號很可能是C/2026 A1。


這顆新彗星的初步軌道模擬顯示它軌道傾角很大，達到144°，這是克魯茲彗星家族成員的典型特徵。它目前位於雕具座，回溯其位置也顯示它起源於天狼星方向，也就是該彗星家族已知的遠日點位置。最令人興奮的是，它目前距離太陽中心距離約為2天文單位，之前從未在距離太陽如此遙遠的地方發現過克魯茲彗星，這表示它的體積可能很大，因此業餘觀測者十分看好其未來亮度增加的潛力。其亮度現約為20等，預計在4月5日通過近日點，此時它與太陽的距離僅為0.021天文單位，視距角僅為0.5°（相當於滿月的寬度）。值得觀測者密切關注這顆彗星的後續發展。

https://www.facebook.com/photo/?fbid=2702516353422671&set=pcb.886132330453544

Gerald Rhemann 與 Michael Jäger 在 01.17 就已經拍到這顆準彗星帶有綠色彗髮，因此我們很有可能看到這顆準彗星被命名為 C/2026 A1 。準彗星兩天前亮度約 16 等（Gerald Rhemann, Michael Jäger, 2026.01.18），預計於 2026.04.04 近日。
這顆準彗星同樣也是克魯茲族掠日彗星。這些彗星據信是兩千年前某顆大彗星的碎片，且近日點離太陽非常近（約 870,000 km, 0.0058 AU），只比 C/2011 W3 (Lovejoy) 稍長一點 （約 840,000 km, 0.0056 AU） 。
至於觀測條件的部分，假設非常樂觀的，這顆彗星真的達到了值得我們觀測的亮度，臺灣可能要等到近日點（2026.04.04）後三天左右才能在航海暮光終（19:01 左右）的天空看到這顆彗星，同樣仰角很低（附圖為了呈現彗星完整軌跡設定的時間為 18:00 左右）。不過必須再次強調彗星本身命運多舛，掠日彗星更甚，我們只能雙手合十祈禱。


(https://scontent-tpe1-1.xx.fbcdn.net/v/t39.30808-6/617544602_2702516360089337_2269246550537039746_n.jpg?stp=cp6_dst-jpg_tt6&_nc_cat=102&ccb=1-7&_nc_sid=aa7b47&_nc_ohc=9rNghnvf5I8Q7kNvwFcyr3p&_nc_oc=AdmoZta6-t2dQNN7Au7i3ghHLnyEDHjO8JMjq_Qnv2bnR5FzQurGcZ4UtTnvgfczE91hCktHkS5ekIPwjHDzNYaE&_nc_zt=23&_nc_ht=scontent-tpe1-1.xx&_nc_gid=e6ZVlOcFh2F8x3pwXSihsA&oh=00_AfpTW9DI_pzCBdy_30jYCEaHKzK5Y_ey6m2201FjrW8NLw&oe=697525E4)

https://www.facebook.com/sociedad.astronomia/photos/orbita-del-cometa-6ac4721-universidad-de-arizona/1272232841602671/

https://www.facebook.com/photo/?fbid=10232818964520816&set=pcb.2689102517926860

https://www.facebook.com/photo/?fbid=2063589804492709&set=gm.3462521497259681&idorvanity=325788820932980 


http://www.cbat.eps.harvard.edu/iau/cbet/005600/CBET005658.txt?fbclid=IwY2xjawPf3sVleHRuA2FlbQIxMABicmlkETFPN1lwVW14bUFTOFI2SGVOc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHj28afTjcBdYwEDKmtjGJk099NYAsJEPXKbogO-4dmKG-HaVoxSAApcaCeO8_aem_Stxj8msI7yWAutXkXASUlA

https://technews.tw/2026/01/25/potentially-bright-sungrazing-comet-discovered/

天文學家 13 日觀測到一顆疑似克魯茲彗星家族成員的大型彗星，4 月初左右會到達近日點。雖然未完全確認，但如果它確實是克魯茲彗星家族成員，將是前所未有的發現。
克魯茲彗星家族屬「掠日彗星」，軌道近日點可達數個太陽半徑內。人們認為它們是幾百年前一顆巨型彗星近距離接觸太陽時，所分裂的彗星碎片。如今，每個碎片都沿相似軌道運行，每隔幾百年就會回到內太陽系。天文學家一直在等這種天體出現。近年最有可能的天體是C/2011 W3（Lovejoy），再上一個令人印象深刻的克魯茲彗星成員出現在1965年，即著名的C/1965 S1（池谷─關彗星），當時以-10等的亮度閃耀夜空。Lovejoy彗星巔峰亮度僅-1等。

新彗星已列入國際天文聯合會小行星中心的「疑似彗星」頁面，暫定編號為6AC4721，一旦確認為彗星，就會有正式編號。目前影像顯示它有彌散彗髮和短小彗尾，應很快就會確認，正式編號可能是C/2026 A1。

彗星初步軌道模擬顯示傾角很大，達144°，是克魯茲彗星家族成員的典型特徵。目前位於雕具座，回溯位置也顯示它起源於天狼星方向，也就是彗星家族已知的遠日點位置。最令人興奮的是，它目前距離太陽中心距離約兩天文單位，之前從未在距離太陽如此遙遠的地方發現克魯茲彗星，代表體積可能很大，因此業餘觀測者十分看好亮度增加潛力。亮度現約為20等，4月5日通過近日點，此時與太陽距離僅0.021天文單位，視距角為0.5°（等於滿月寬度），天文觀測愛好者可密切關注後續發展。

C/2026 A1(MAPS)  C/2026 A1 預計 4 月近距離通過太陽，若沒有解體，有機會上演夜空甚至白天肉眼可見的壯觀景象  _現在 C/2026 A1（MAPS）粉墨登場，正沿著典型克魯茲彗星掠日軌道移動，雖然 C/2026 A1（MAPS）彗星核心不太可能池谷－關彗星一樣大，但最近觀察表明它正逐漸變亮，說明它應是相對大的克魯茲碎片。

如果 C/2026 A1 彗星抵達近日點附近幸運未解體，預計 4 月初～中旬可上演精彩彗星秀，天文學家將持續觀察並等待，同月還有另一顆名為 C/2025 R3 的彗星，也可能角逐今年最亮彗星寶座。  https://technews.tw/2026/02/06/c2026-a1-comet-kreutz-sungrazers/

https://au.news.yahoo.com/comet-just-discovered-visible-broad-041430793.html?guccounter=1&guce_referrer=aHR0cHM6Ly93d3cuZ29vZ2xlLmNvbS8&guce_referrer_sig=AQAAAEsek4X7_SdP-3Wxo0OWfrGCc7fD6NWSyX7EPguvPVy6nPUVdf36GQ34jGJeoUAkDZtp211W9a7vWHOtvxqPApnSth4z8K5VWE497EDzHqckaLDMAFh_yi-tVizrgpXgUoYOC3BXgJkCtjYJQynxdqxkqK1mJ-qtRpNVfPjFYcms

more

https://hdr-astrophotography.com/?fbclid=IwdGRjcAP7t_9jbGNrA_u3_GV4dG4DYWVtAjExAHNydGMGYXBwX2lkDDM1MDY4NTUzMTcyOAABHliDs17uCr8olPvOuW-XaEZ7QH7Z2yHcsl0S45ocD5hussGCqVYhX1M3Sckw_aem_oedXk_kF1UkJi3qq-cnMHw

https://starwalk.space/en/news/comet-c2026-a1-maps



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 C/2026 A1 (MAPS) 彗尾預測

Nicolas Lefaudeux 在其個人網站中新增了對 C/2026 A1 (MAPS) 的狀況預測及彗尾預測動畫。

https://hdr-astrophotography.com/?fbclid=IwdGRjcAP7t_9jbGNrA_u3_GV4dG4DYWVtAjExAHNydGMGYXBwX2lkDDM1MDY4NTUzMTcyOAABHliDs17uCr8olPvOuW-XaEZ7QH7Z2yHcsl0S45ocD5hussGCqVYhX1M3Sckw_aem_oedXk_kF1UkJi3qq-cnMHw

他指出， C/2026 A1 (MAPS) 在距離太陽 2 AU 處就被發現，不同不同於近期較小的同族彗星（如 C/2011 W3 (Lovejoy)），
顯示其核心體積可能較大。且現在（2026.02.13）彗星已經進入快速增亮階段，近日點前解體的機率越來越小。

同時，Lefaudeux 也給出了四種可能的演化劇本
（彗尾模擬動畫須至網站觀看，網址在留言）
 (https://hdr-astrophotography.com/wp-content/uploads/2026/02/preperihelion_breakup.gif)


劇本 1（過近日點前解體）：像 C/2012 S1 (ISON) 一樣消失，目前看來機率較低。

劇本 2（無頭彗星）：像 C/2011 W3 (Lovejoy) ，過近日點後核心解體，只剩下明亮的彗尾。
 若 C/2026 A1 (MAPS) 持續增亮，其體積可能會超過此劇本的預期。

劇本 3（中型克魯茲彗星）：成功通過近日點。彗尾長度約 5-20 度，對天文愛好者來說很美，但亮度可能不足以引起大眾廣泛關注。

劇本 4（池谷-關級別的大彗星）：體積巨大，高活性通過近日點。可能在白天可見，彗尾長達 30 度且極亮。這是最理想的情況。
 

more

https://cobs.si/comet/2688/

The MPC released a new orbit yesterday for C/2026 A1 (MAPS) in MPEC 2026-C98. Its period is now estimated at 1892 ± 168 years. Could it plausibly be a fragment from the first millennium AD?
https://www.minorplanetcenter.net/mpec/K26/K26C98.html
https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=C%2F2026%20A1

https://www.facebook.com/photo?fbid=10233200868708182&set=pcb.2720321854804926

UPDATE

https://www.facebook.com/photo/?fbid=10233200868708182&set=pcb.2720321854804926

https://www.facebook.com/photo/?fbid=1367622415379231&set=a.419550426853106 

(https://scontent.ftpe7-2.fna.fbcdn.net/v/t39.30808-6/641377116_1367622422045897_3055011507883335098_n.jpg?_nc_cat=111&ccb=1-7&_nc_sid=13d280&_nc_ohc=2zqdxdy4_tsQ7kNvwGSklpy&_nc_oc=AdmYHF3Hkg1c3NreOwKsbdLqINAxy6pmwDOxmiua2bXZc6Yi3zY4zSqcWlZBjHvfeZY&_nc_zt=23&_nc_ht=scontent.ftpe7-2.fna&_nc_gid=35DyHZSL_121z-uDOZRkaQ&oh=00_AfvF4gz0bgWVQyxUOQgU3XMsp2drL4jbh_PH_vjnieYEEA&oe=69A1B869)

https://www.facebook.com/photo/?fbid=899795019461920&set=a.116668651107898

https://www.facebook.com/photo?fbid=2363543467495805&set=pcb.2722278087942636 

https://www.facebook.com/share/p/1HxJoJ6Grs/


劇本 1（過近日點前解體）：像 C/2012 S1 (ISON) 一樣消失，目前看來機率較低。

劇本 2（無頭彗星）：像 C/2011 W3 (Lovejoy) ，過近日點後核心解體，只剩下明亮的彗尾。
 若 C/2026 A1 (MAPS) 持續增亮，其體積可能會超過此劇本的預期。

劇本 3（中型克魯茲彗星）：成功通過近日點。彗尾長度約 5-20 度，對天文愛好者來說很美，但亮度可能不足以引起大眾廣泛關注。
    => 可能這

劇本 4（池谷-關級別的大彗星）：體積巨大，高活性通過近日點。可能在白天可見，彗尾長達 30 度且極亮。這是最理想的情況。
 

https://www.facebook.com/photo/?fbid=25656506800716383&set=gm.2731672483669863&idorvanity=123943134442824

https://astronomie.be/pieterjan.dekelver/Observations/2026/20260302_1904_CK26A010_M09_FINAL.jpg?fbclid=IwY2xjawQYofZleHRuA2FlbQIxMABicmlkETFud3M0bEdoS2NsVG5FSHIyc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHmI0YrigoyZseI5zZYrSr5AP71NdlxGqpvA4FqwldGtSrtDLNAL-JEIYGF_T_aem_stsO5pX4iHV4a0QBYUWF1Q

https://www.facebook.com/photo/?fbid=26030201853297043&set=gm.2735335596636885&idorvanity=123943134442824

https://www.facebook.com/photo/?fbid=10236814638358506&set=a.10202599826169585

Nicolas Lefaudeux

Update on the magnitude of comet MAPS: The comet’s brightness has been increasing smoothly since last update. Comet MAPS appears to be a “medium Kreutz”, with both its absolute magnitude and rate of brightening intermediate between comets Ikeya-Seki and Lovejoy.
At this point, the outcome that seems most plausible is that the comet should survive perihelion, and be a very nice object for astronomers, but would probably not be bright enough to reach the “Great Comet” status. But remember that nothing will be certain until a few days after perihelion, as it is the dust released between ~6 hours and 3–4 days after perihelion that mostly determines the tail’s length and brightness.
This outcome corresponds to the "Scenario 3" of my simulations https://hdr-astrophotography.com/


(https://scontent-tpe1-1.xx.fbcdn.net/v/t39.30808-6/650356974_10236814638398507_5497232612157264439_n.jpg?_nc_cat=101&ccb=1-7&_nc_sid=13d280&_nc_ohc=syeg6zNVs9QQ7kNvwET_xNy&_nc_oc=Admwmcoev_whPzzLrI2yajcAS6z2dCEfxqjbuU3PliRQYx2vnmzcMnmTT-eLok6sSgR0SDs5KBHdjm-R4AqHl1ev&_nc_zt=23&_nc_ht=scontent-tpe1-1.xx&_nc_gid=6T1xItTr5y5nEDfFyITP3g&_nc_ss=8&oh=00_AfwWEa-f8agvlSgEgo4M6g1ymxijXDbNcrviZn9xTCboQw&oe=69B734BB)

MORE

一個不好的消息:  C/2026 A1 (MAPS)彗星的彗核可能只有約400公尺大小，或許與C/2011 W3 (Lovejoy)彗星的彗核大小相仿。由張啟成領導的天文學家團隊利用詹姆斯韋伯太空望遠鏡(JWST)觀測了MAPS彗星，並得出結論：其彗核很小，只有約400公尺大小。 MAPS彗星的固有亮度遠高於Lovejoy彗星，顯示其氣體噴發更為劇烈，這可能導致該彗星在到達近日點之前就自行解體。一切都充滿了變數。
資料來源:X ( Jure Atanackov )

https://www.facebook.com/groups/cometmeteortaiwan/permalink/930802139319896/?rdid=eSRgp1TBni0SDIe9


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https://iopscience.iop.org/article/10.3847/2515-5172/ae5220?fbclid=IwY2xjawQnTcVleHRuA2FlbQIxMABicmlkETFWMHpSeUVCZ0ltUFNFUXNvc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHlsbY_HMCG2GaqVHBFdfp-XKTcTH-W9LXGIpp9uGgC5HubClEI4YTKWNtwSe_aem_yXpmwGfLtAhs6MnkhLWsdg

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The following article is Open access
Preliminary Nucleus Size Estimate for Kreutz Sungrazer C/2026 A1 (MAPS)

Qicheng Zhang, Matthew M. Knight, Quanzhi Ye (叶泉志), Carl A. Schmidt, and Karl Battams

Published March 2026 • © 2026. The Author(s). Published by the American Astronomical Society.
Research Notes of the AAS, Volume 10, Number 3Citation Qicheng Zhang et al 2026 Res. Notes AAS 10 57DOI 10.3847/2515-5172/ae5220
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Abstract

JWST imagery of the approaching Kreutz sungrazer C/2026 A1 (MAPS) appears sufficient to distinguish the comet’s nucleus from the surrounding dust. Coma model fitting indicates the morphology is compatible with a ∼0.4 km diameter nucleus—likely larger than those of the minor Kreutz fragments routinely discovered with coronagraphs, and comparable to or slightly smaller than that of C/2011 W3 (Lovejoy). However, since C/2026 A1 is the only Kreutz sungrazer whose nucleus has been directly observed, these comparisons should be treated with caution.

 
https://x.com/JAtanackov/status/2034059176184283580


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https://x.com/JAtanackov/status/2033842879626461683/photo/1

(https://pbs.twimg.com/media/HDmpUcPaoAAk78n?format=jpg&name=900x900)

https://www.facebook.com/photo/?fbid=1461673788658348&set=a.320385586120513

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