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Old September 16th, 2019 #1
Jerry Abbott
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Join Date: Nov 2007
Location: In the hills north of Hillsboro WV
Posts: 1,048
Default Ephemeris Data for Interstellar Comet C2019/Q4 Borisov for December 2019

Update! The number of observations used to calculate the orbit of C/2019 Q4 Borisov has risen to 191, and the observation window has increased to 17 days.

ORBITAL ELEMENTS
(Source: JPL Horizons)
a = −0.7781551285572716 AU
e = 3.671308355477072
i = 43.41394016133616°
Ω = 308.778082713247°
ω = 207.5295555941889°
T = 2458824.336063735653

PERIHELION
time: 20h 03m 56s on 6 Dec 2019 UTC (JD 2458824.33606)
Borisov mean Anomaly: 0°
Borisov eccentric Anomaly: 0°
Borisov true Anomaly: 0°
HEC x = −1.69856974 AU
HEC y = +0.99990482 AU
HEC z = −0.660312704 AU
HEC Vx = −9496.47252 m/s
HEC Vy = −34101.7983 m/s
HEC Vz = −27211.5493 m/s
HEC distance: 2.0786923 AU
HEC longitude: 149.51576°
HEC latitude: −18.5213341°
speed relative to the sun: 44649.5695 m/s = 0.0001489349 c
obliquity of the ecliptic: 23.4366997°
Geocentric distance: 2.07650491 AU = 17.2697647 light minutes
Geocentric right ascension: 11h 24m 8.17s
Geocentric declination −16° 21' 50.6"
Angle Sun-Earth-Borisov: 76.4071512°

CLOSEST APPROACH TO EARTH
time: 22h 18m on 27 December 2019 UTC (JD 2458845.429)
Borisov mean anomaly: 30.2859998°
Borisov eccentric anomaly: 11.238287°
Borisov true anomaly: 14.73215°
HEC x = −1.801710900 AU
HEC y = +0.578236969 AU
HEC z = −0.986248492 AU
HEC Vx = −7443.45651 m/s
HEC Vy = −35031.0194 m/s
HEC Vz = −26247.9238 m/s
HEC distance: 2.13382432 AU
HEC longitude: 162.206605°
HEC latitude: −27.5290061°
speed relative to the sun: 44401.9242 m/s = 0.0001481089 c
obliquity of the ecliptic: 23.4366922°
Geocentric distance: 2.01077281 AU = 16.7230875 light minutes
Geocentric right ascension: 11h 56m 39.92s
Geocentric declination: −31° 57' 07.4"
Angle Sun-Earth-Borisov: 83.363751°

EPHEMERIS for December 2019
All positions for 9pm Eastern Standard Time
(date) (right ascension) (declination)
1 Dec 11h 16m 21.14s −12° 50' 40.0"
6 Dec 11h 24m 32.24s −16° 32' 53.5"
A meddlesome waxing moon
11 Dec 11h 32m 33.81s −20° 16' 58.8"
Full moon on 12 Dec.
16 Dec 11h 40m 24.50s −24° 00' 59.2"
21 Dec 11h 48m 02.68s −27° 42' 54.8"
26 Dec 11h 55m 26.44s −31° 20' 48.3"
31 Dec 12h 02m 33.54s −34° 52' 49.3"

Borisov's hyperbolic excess speed is 33764.5 m/s.
Borisov is expected to have a maximum apparent magnitude of +15.5

Keplerian elements for Earth's orbit used in the calculations
(Source: JPL Horizons)
a = 0.999979880035 AU
e = 0.016746237127
i = 0.002629517126°
Ω = 176.998598374440°
ω = 286.128451007821°
T = 2458852.8248407785 JD