(Posted here 8 October 2019)
Observations: 402 over 37 days.
ORBITAL ELEMENTS
a = −0.852093539281182 AU
e = 3.354075587715023
i = 44.05688099659861°
Ω = 308.1430298932183°
ω = 209.1418223232404°
T = 2458826.0739990142 JD
ECLIPTIC CROSSING
From North to South at 10h 8m 8s on 26 October 2019 UTC (JD 2458782.92231)
Borisov mean anomaly: −54.0718309°
Borisov eccentric anomaly: −22.1747851°
Borisov true anomaly: −29.1418229°
HEC x = −1.3727507 AU
HEC y = +1.74802867 AU
HEC z = 0
HEC Vx = −12216.5272 m/s
HEC Vy = −30524.6196 m/s
HEC Vz = −27538.9017 m/s
HEC distance: 2.22262204 AU
HEC longitude: 128.143029°
HEC latitude: 0°
speed relative to the sun: 42888.0758 m/s = 0.000143059222 c
obliquity of the ecliptic: 23.4367145°
Geocentric distance: 2.52364945 AU = 20.9885525 light minutes
Geocentric right ascension: 10h 13m 01.04s
Geocentric declination: +11° 02′ 23.0″
Angle Sun-Earth-Borisov: 61.2033762°
Angle Earth-Sun-Borisov: 95.7181233°
PERIHELION
time: 13h 46m 34s on 8 Dec 2019 UTC (JD 2458826.074)
Borisov mean anomaly: 0°
Borisov eccentric anomaly: 0°
Borisov true anomaly: 0°
HEC x = −1.63416383 AU
HEC y = +0.944315936 AU
HEC z = −0.679250399 AU
HEC Vx = −8464.22089 m/s
HEC Vy = −33818.2948 m/s
HEC Vz = −26651.7784 m/s
HEC distance: 2.0058926 AU
HEC longitude: 149.978153°
HEC latitude: −19.7932761°
speed relative to the sun: 43882.0851 m/s = 0.000146374880 c
obliquity of the ecliptic: 23.4366991°
Geocentric distance: 1.99356926 AU = 16.58001 light minutes
Geocentric right ascension: 11h 28m 24.21s
Geocentric declination: −18° 20′ 52.6″
Angle Sun-Earth-Borisov: 76.4376538°
Angle Earth-Sun-Borisov: 75.0481667°
CLOSEST APPROACH TO MARS
time: 4h 17m on 9 December 2019 UTC (JD 2458826.6785)
Borisov mean anomaly: 0.757477035°
Borisov eccentric anomaly: 0.321770195°
Borisov true anomaly: 0.437602988°
HEC x = −1.63710797 AU
HEC y = +0.932502726 AU
HEC z = −0.688550708 AU
HEC Vx = −8401.45478 m/s
HEC Vy = −33854.3055 m/s
HEC Vz = −26625.5343 m/s
HEC distance: 2.00593767 AU
HEC longitude: 150.334002°
HEC latitude: −20.0753891°
speed relative to the sun: 43881.8586 m/s = 0.000146374124 c
Distance from Mars: 1.72622438 AU = 14.3565704 light minutes
Angle Sun-Mars-Borisov: 73.7457712°
Angle Mars-Sun-Borisov: 55.7062918°
CLOSEST APPROACH TO EARTH
time: 3h 48m on 28 December 2019 UTC (JD 2458845.658)
Borisov mean anomaly: 24.5400004°
Borisov eccentric anomaly: 10.3442762°
Borisov true anomaly: 13.9606081°
HEC x = −1.71833621 AU
HEC y = +0.556129062 AU
HEC z = −0.975294055 AU
HEC Vx = −6425.9335 m/s
HEC Vy = −34733.5313 m/s
HEC Vz = −25647.6127 m/s
HEC distance: 2.05259771 AU
HEC longitude: 162.066141°
HEC latitude: −28.3691884°
speed relative to the sun: 43652.1575 m/s = 0.000145607924 c
obliquity of the ecliptic: 23.4366921°
Geocentric distance: 1.93627047 AU = 16.1034705 light minutes
Geocentric right ascension: 11h 59m 55.28s
Geocentric declination: −33° 17′ 14.7″
Angle Sun-Earth-Borisov: 82.4099363°
Angle Earth-Sun-Borisov: 69.2381358°
EPHEMERIS for December 2019
All positions for 9pm Eastern Standard Time
(date) (right ascension) (declination) (geoc. distance)
1 Dec 11h 17m 28.47s −13° 23' 23.2" 2.03908496
6 Dec 11h 25m 54.63s −17° 12' 07.9" 2.00283791
A meddlesome waxing moon
11 Dec 11h 34m 13.71s −21° 03' 13.8" 1.97454386
Full moon on 12 Dec.
16 Dec 11h 42m 24.60s −24° 54' 35.6" 1.95417253
21 Dec 11h 50m 25.90s −28° 44' 03.8" 1.94156354
26 Dec 11h 58m 15.92s −32° 29' 30.6" 1.93643288
31 Dec 12h 05m 52.57s −36° 08' 56.2" 1.93838759
Expected brightest apparent magnitude: +15.5
Borisov's hyperbolic excess speed: 32266.3243 m/s
HEC : heliocentric ecliptic coordinates
Right ascension and declination are measured in geocentric celestial coordinates.
Borisov entered the solar system from a direction that is closely marked by the Stock 2 open star cluster near the border between Cassiopia and Perseus. It is about two-and-a-half degrees north by northwest of the Double Cluster in Perseus.
Today (8 October 2019 at 10:00pm EDT, or JD 2458765.583333) Borisov can be found in Leo at
Right Ascension: 9h 41m 21.29s
Declination: +19° 42' 47.2"
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