http://www.aerith.net/comet/catalog/2019Y4/2019Y4.html
JPL/HORIZONS ATLAS (C/2019 Y4) 2020-Mar-18 21:59:13
Rec #:90004446 (+COV) Soln.date: 2020-Mar-09_07:19:55 # obs: 586 (2019-2020)
IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs):
EPOCH= 2458884.5 ! 2020-Feb-05.0000000 (TDB) RMSW= n.a.
EC= .9992446427560784 QR= .2528511246809229 TP= 2459000.515108983
OM= 120.569994312319 W= 177.4078594843987 IN= 45.38173634030989
A= 334.7437609364624 MA= 359.98132976049 ADIST= 669.2346707482438
PER= 6124.5890168075 N= .000160929 ANGMOM= .012230574
DAN= 284.34694 DDN= .25298 L= 298.7486958
B= 1.8447771 MOID= .63108897 TP= 2020-May-31.0151089830
Comet physical (GM= km^3/s^2; RAD= km):
GM= n.a. RAD= n.a.
M1= 7.7 M2= 13.9 k1= 21.5 k2= 5. PHCOF= .030
COMET comments
1: soln ref.= JPL#4, data arc: 2019-12-28 to 2020-03-05
2: k1=21.5, k2=5., phase coef.=0.03;