TRAPPIST comets production rates: C/2017 K2 (PanSTARRS), C/2022 E3 (ZTF), C/2022 P1 (NEOWISE), and 73P/SW-3
ATel #15743; E. Jehin, M. Vander Donckt, J. Manfroid, and Y. Moulane (STAR Institute, University of Liege)
on 3 Nov 2022; 23:03 UT
Credential Certification: Emmanuel Jehin (ejehin@uliege.be)
The authors report that they obtained from TRAPPIST 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/2017 K2 (PANSTARRS)
Date UT=2022-10-19, rh=1.96 au, Delta=2.54 au, DT=-61.0 days
Q(OH)=1.16+/-0.23 E29 s-1
Q(CN)=1.99+/-0.22 E26 s-1
Q(C2)=1.99+/-0.33 E26 s-1
A(0)fp(RC)=10766+/-557 cm
C/2022 E3 (ZTF)
Date UT=2022-10-17, rh=1.75 au, Delta=2.23 au, DT=-87.0 days
Q(OH)=1.94+/-1.24 E28 s-1
Q(CN)=2.48+/-0.44 E25 s-1
Q(C2)=1.70+/-0.50 E25 s-1
A(0)fp(RC)=2638+/-386 cm
C/2022 P1 (NEOWISE)
Date UT=2022-10-21, rh=1.67 au, Delta=1.25 au, DT=-37.0 days
Q(OH)=1.54+/-0.21 E28 s-1
Q(CN)=3.39+/-0.29 E25 s-1
Q(C2)=3.28+/-0.23 E25 s-1
A(0)fp(R)=276+/-23 cm
73P/Schwassmann-Wachmann 3
Date UT=2022-10-28, rh=1.32 au, Delta=1.15 au, DT=+64.0 days
Q(OH)=5.61+/-0.74 E27 s-1
Q(CN)=2.08+/-0.18 E25 s-1
Q(C2)=3.92+/-0.72 E24 s-1
A(0)fp(RC)=560+/-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/
