Unpublished conference/Abstract (Scientific congresses and symposiums)
A dense monitoring of 2I/Borisov activity with TRAPPIST telescopes
Jehin, Emmanuel; Moulane, Youssef; Pozuelos Romero, Francisco José et al.
202014th Europlanet Science Congress 2020
 

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Abstract :
[en] We report on the regular observation with broad band and cometary narrow band filters of the first interstellar active comet, 2I/Borisov, with both TRAPPIST-South and -North telescopes (TS and TN) [1]. We followed 2I activity since its discovery on September 11, 2019 (rh=2.8 au inbound) until the beginning of March 2020 when it was 2.9 au outbound and TS operations had to stop because of Covid-19 and la Silla Observatory closure. The comet activity reached a maximum on November 29, 2019 (rh=2.01au), 10 days before perihelion with an apparent magnitude of 16.50±0.04 measured within an aperture radius of 5 arcsec in R filter, an A(0)fp(R) dust proxy = 135±7 cm and a Q(CN)=(4.5±0.7) 1024 molecules/s (using a Haser model and vp=vd=1km/s [2]). Unlike the first interstellar object, 1I/Oumuamua, discovered in 2017 [3,4], 2I was showing an extended coma surrounding its nucleus and a short tail. We first detected CN in 2I with TN on October 18 when the comet was 2.65 au from the Sun while we never detected C2. We were able to follow the CN activity of 2I for more than 3 months.Figure 1: Light curve (R mag) and A(0)fp dust proxy of 2I/Borisov as a function of days to perihelion. The A(0)fp values are computed at 10 000 km from the nucleus and normalized to phase angle of 0°.References:[1] Jehin, E., Gillon, M., Queloz, D., et al. 2011, The Messenger, 145, 2[2] Haser, 1957, Bulletin de l'Académie Royale de Belgique, vol. 43, p. 740-750[3] Meech, K. J., Weryk, R., Micheli, M., et al. 2017, Nature, 552, 378[4] Micheli, M., Farnocchia, D., Meech, K. J., et al. 2018, Nature, 559, 223
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Moulane, Youssef  ;  Université de Liège - ULiège > STAR
Pozuelos Romero, Francisco José  ;  Université de Liège (ULiege), STAR Institute, Liège, Belgium
Manfroid, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Benkhaldoun, Zouhair
Language :
English
Title :
A dense monitoring of 2I/Borisov activity with TRAPPIST telescopes
Publication date :
01 September 2020
Event name :
14th Europlanet Science Congress 2020
Event date :
21 September 2020 - 9 October, 2020
Audience :
International
References of the abstract :
https://www.epsc2020.eu/, id. EPSC2020-813
Available on ORBi :
since 08 December 2020

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