TRAPPIST comets production rates: C/2022 E3 (ZTF), C/2017 K2 (PANSTARRS), C/2022 U2 (ATLAS), C/2021 Y1 (ATLAS), C/2022 P1 (NEOWISE), and 81P/Wild 2
ATel #15973; E. Jehin, M. Vander Donckt, J. Manfroid, S. Hmiddouch, Y. Moulane (STAR Institute, University of Liege) and A. Jabiri, Z. Benkhaldoun (Oukaimeden Observatory)
on 2 Apr 2023; 15:46 UT
Credential Certification: Emmanuel Jehin (ejehin@uliege.be)
The authors report that they obtained from TRAPPIST-South and TRAPPIST-North robotic telescopes (Jehin et al. 2011) recent observations using cometary HB narrowband filters (Farnham et al. 2000) for the following comets and computed preliminary production rates at 10.000 km using a Haser Model (Vp=Vd=1km/s) (Haser 1957). The dust production rates proxy A(0)f(rho) were estimated by profile fitting at 10.000 km (A'Hearn et al. 1984) and corrected for the phase angle (Schleicher 2007).
C/2022 E3 (ZTF)
Date UT=2023-03-24, r_h=1.58 au, Delta=1.64 au, DT=+70.0 days
Q(OH) = 1.51 +/- 0.19 E28 s-1
Q(CN) = 2.56 +/- 0.13 E25 s-1
Q(C3) = 5.82 +/- 0.43 E24 s-1
Q(C2) = 3.01 +/- 0.18 E25 s-1
A(0)fp(R) = 2617 +/- 42 cm
A(0)fp(BC) = 2095 +/- 87 cm
C/2017 K2 (PANSTARRS)
Date UT=2023-03-26, r_h=2.18 au, Delta=2.46 au, DT=+96.0 days
Q(OH) = 4.01 +/- 0.57 E28 s-1
Q(CN) = 1.37 +/- 0.06 E26 s-1
Q(C3) = 3.53 +/- 0.23 E25 s-1
Q(C2) = 1.40 +/- 0.07 E26 s-1
A(0)fp(R) = 7576 +/- 67 cm
A(0)fp(BC) = 6289 +/- 200 cm
C/2021 Y1 (ATLAS)
Date UT=2023-03-19, r_h=2.09 au, Delta=2.44 au, DT=-43.0 days
Q(OH) = 7.02 +/- 2.38 E27 s-1
Q(CN) = 1.30 +/- 0.07 E25 s-1
Q(C2) = 1.13 +/- 0.11 E25 s-1
A(0)fp(R) = 443 +/- 21 cm
A(0)fp(BC) = 377 +/- 32 cm
C/2022 U2 (ATLAS)
Date UT=2023-03-18, r_h=1.62 au, Delta=1.12 au, DT=+62.0 days
Q(OH) = 1.07 +/- 0.24 E27 s-1
Q(CN) = 3.64 +/- 0.37 E24 s-1
Q(C3) = 8.49 +/- 1.36 E23 s-1
Q(C2) = 4.22 +/- 0.61 E24 s-1
A(0)fp(R) = 38 +/- 13 cm
C/2022 P1 (NEOWISE)
Date UT=2023-03-25, r_h=2.18 au, Delta=1.97 au, DT=+116.0 days
Q(OH) = 5.08 +/- 3.84 E26 s-1
Q(CN) = 5.79 +/- 0.78 E24 s-1
Q(C2) = 4.48 +/- 1.56 E24 s-1
A(0)fp(R) = 154 +/- 27 cm
81P/Wild 2
Date UT=2023-03-18, r_h=1.84 au, Delta=1.44 au, DT=+92.0 days
Q(OH) = 2.33 +/- 0.55 E27 s-1
Q(CN) = 1.03 +/- 0.06 E25 s-1
Q(C3) = 1.28 +/- 0.25 E24 s-1
Q(C2) = 6.27 +/- 1.14 E24 s-1
A(0)fp(R) = 539 +/- 30 cm
A(0)fp(BC) = 323 +/- 40 cm
Notations: rh= heliocentric distance (in au), Delta=geocentric distance (in au), DT= Time to perihelion. OH, NH, C3, CN, C2 are the HB gaseous narrowband filters for the corresponding species, and BC, GC, RC are the blue, green and red dust continuum filters (Farnham et al. 2000).
Acknowledgments: TRAPPIST is a project funded by the Belgian F.R.S.-FNRS under grant PDR T.0120.21. Observations were carried on from the ESO La Silla Paranal and Oukaimeden Observatory. We thank NASA, David Schleicher and the Lowell Observatory for the loan of the HB comet filters. https://www.trappist.uliege.be/
