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Old September 16th, 2019 #1
Jerry Abbott
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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
 
Old September 16th, 2019 #2
Ray Allan
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This comet appears to be of interstellar origin too, just like Oumuamua. Or possibly something pulled in from the Oort Cloud by our sun's gravity.
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Old September 17th, 2019 #3
Hugh Akston
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Interesting.
 
Old 4 Weeks Ago #4
Jerry Abbott
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The astronomers are still fine-tuning the estimates of the orbital elements for C2019/Q4 Borisov. The most recently published set appear below. The determination for these elements involved 253 observations made over 21 days. The orbital elements are from JPL's Horizons webpage. The calculations are by me.

ORBITAL ELEMENTS
a = −0.8292162089229415 AU
e = 3.445224326645891
i = 43.86288391209771
Ω = 308.3331498795959
ω = 208.6433660112291
T = 2458825.5456982227 JD

PERIHELION
time: 1h 5m 48s on 8 Dec 2019 UTC (JD 2458825.54570)
Borisov mean Anomaly: 0
Borisov eccentric Anomaly: 0
Borisov true Anomaly: 0
HEC x = −1.65339477 AU
HEC y = +0.961210424 AU
HEC z = −0.673499574 AU
HEC Vx = −8777.78593 m/s
HEC Vy = −33890.4638 m/s
HEC Vz = −26819.2028 m/s
HEC distance: 2.02761965 AU
HEC longitude: 149.828179
HEC latitude: −19.400094
speed relative to the sun: 44100.8243 m/s = 0.000147104516 c
obliquity of the ecliptic: 23.4366993
Geocentric distance: 2.01814923 AU = 16.7844354 light minutes
Geocentric right ascension: 11h 27m 03.85s
Geocentric declination: −17 43′ 56.4"
Angle Sun-Earth-Borisov: 76.4422795
Angle Earth-Sun-Borisov: 75.3737762

CLOSEST APPROACH TO EARTH
time: 2h 48m on 28 December 2019 UTC (JD 2458845.617)
Borisov mean anomaly: 26.198589
Borisov eccentric anomaly: 10.6281615
Borisov true anomaly: 14.2156562
HEC x = −1.74324442 AU
HEC y = +0.562480355 AU
HEC z = −0.978914843 AU
HEC Vx = −6730.66368 m/s
HEC Vy = −34811.9564 m/s
HEC Vz = −25825.2031 m/s
HEC distance: 2.07691106 AU
HEC longitude: 162.117033
HEC latitude: −28.1208006
speed relative to the sun: 43864.7382 m/s = 0.000146317017 c
obliquity of the ecliptic: 23.4366922
Geocentric distance: 1.95820212 AU = 16.2858705 light minutes
Geocentric right ascension: 11h 58m 55.14s
Geocentric declination: −32 53′ 45.1"
Angle Sun-Earth-Borisov: 82.7202806
Angle Earth-Sun-Borisov: 69.2675344

EPHEMERIS for December 2019
All positions for 9pm Eastern Standard Time
(date) (right ascension) (declination)
1 Dec 11h 17m 06.88s −13 13' 15.4"
6 Dec 11h 25m 28.22s −16 59' 59.2"
A meddlesome waxing moon
11 Dec 11h 33m 41.69s −20 48' 55.2"
Full moon on 12 Dec.
16 Dec 11h 41m 46.08s −24 38' 01.1"
21 Dec 11h 49m 39.93s −28 25' 10.3"
26 Dec 11h 57m 21.45s −32 08' 18.3"
31 Dec 12h 04m 48.51s −35 45' 28.3"

Expected brightest apparent magnitude: +15.5
Borisov's hyperbolic excess speed: 32708.4 m/s

HEC : heliocentric ecliptic coordinates

Right ascension and declination are measured in geocentric celestial coordinates.

Angles are subtended by the object in the middle; the two objects on the ends are at the far end of the "rays." That is: Angle sun-Earth-Borisov is the angular distance between the sun and Borisov, to an observer on Earth.
 
Old 4 Weeks Ago #5
Ray Allan
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__________________
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--Henry A. Kissinger, jewish politician and advisor
 
Old 3 Weeks Ago #6
Ray Allan
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2I/Borisov is now confirmed as interstellar in origin. One proposal has the comet originating from Kruger 60, a binary star system 13.15 LY from the Sun in the constellation Cepheus. These red dwarf stars orbit each other every 44.6 years.

https://forum.nasaspaceflight.com/in...?topic=49027.0

https://en.wikipedia.org/wiki/Kruger_60
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Old 3 Weeks Ago #7
Jerry Abbott
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Ephemeris Data for Interstellar Comet C2019/Q4 Borisov for December 2019
(Posted here 30 September 2019)

Observations: 352 over 28 days.

ORBITAL ELEMENTS
a = −0.8629627927855268 AU
e = 3.314321521681457
i = 44.13726830050443
Ω = 308.0625257752799
ω = 209.3364247323087
T = 2458826.2966745845 JD

ECLIPTIC CROSSING
From North to South at 9h 46m on 26 October 2019 UTC (JD 2458782.9071)
Borisov mean anomaly: −53.3459328
Borisov eccentric anomaly: −22.2440684
Borisov true anomaly: −29.3369573
HEC x = −1.36585394 AU
HEC y = +1.74431039 AU
HEC z = 0
HEC Vx = −12141.0748 m/s
HEC Vy = −30433.6517 m/s
HEC Vz = −27481.7902 m/s
HEC distance: 2.2154403 AU
HEC longitude: 128.062144
HEC latitude: 0
Sun-relative speed: 42765.192 m/s = 0.00014264933 c
obliquity of the ecliptic: 23.4367145
Geocentric distance: 2.51604687 AU = 20.9253237 light minutes
Geocentric right ascension: 10h 13m 00.11s
Geocentric declination: +11 02′ 29.4″
Angle Sun-Earth-Borisov: 61.1924191
Angle Earth-Sun-Borisov: 95.6523918

PERIHELION
time: 19h 7m 12s on 8 Dec 2019 UTC (JD 2458826.29667)
Borisov mean Anomaly: 0
Borisov eccentric Anomaly: 0
Borisov true Anomaly: 0
HEC x = −1.62629197 AU
HEC y = +0.937854121 AU
HEC z = −0.68139968 AU
HEC Vx = −8340.84106 m/s
HEC Vy = −33772.0624 m/s
HEC Vz = −26575.6290 m/s
HEC distance: 1.99717336 AU
HEC longitude: 150.028704
HEC latitude: −19.9489066
speed relative to the sun: 43776.545 m/s = 0.000146022836 c
obliquity of the ecliptic: 23.4366990
Geocentric distance: 1.98341086 AU = 16.4955252 light minutes
Geocentric right ascension: 11h 28m 55.32s
Geocentric declination: −18 35′ 41.0"
Angle Sun-Earth-Borisov: 76.4502253
Angle Earth-Sun-Borisov: 74.8988850

CLOSEST APPROACH TO EARTH
time: 5h 5m on 28 December 2019 UTC (JD 2458845.7115)
Borisov mean anomaly: 23.8698428
Borisov eccentric anomaly: 10.2358717
Borisov true anomaly: 13.8703707
HEC x = −1.7083606 AU
HEC y = +0.5535491 AU
HEC z = −0.974000527 AU
HEC Vx = −6303.72996 m/s
HEC Vy = −34686.0621 m/s
HEC Vz = −25566.1023 m/s
HEC distance: 2.04293651 AU
HEC longitude: 162.046454
HEC latitude: −28.4743282
speed relative to the sun: 43548.6567 m/s = 0.0001452626827 c
obliquity of the ecliptic: 23.4366921
Geocentric distance: 1.9270542 AU = 16.026821 light minutes
Geocentric right ascension: 12h 00m 19.13s
Geocentric declination: −33 27′ 37.5"
Angle Sun-Earth-Borisov: 82.3130245
Angle Earth-Sun-Borisov: 69.1958519

EPHEMERIS for December 2019
All positions for 9pm Eastern Standard Time
(date) (right ascension) (declination)
1 Dec 11h 17m 35.00s −13 26' 52.1"
6 Dec 11h 26m 02.82s −17 16' 22.7"
A meddlesome waxing moon
11 Dec 11h 34m 23.86s −21 08' 18.3"
Full moon on 12 Dec.
16 Dec 11h 42m 37.04s −25 00' 33.2"
21 Dec 11h 50m 41.01s −28 50' 56.3"
26 Dec 11h 58m 34.09s −32 37' 18.7"
31 Dec 12h 06m 14.25s −36 17' 39.3"

Expected brightest apparent magnitude: +15.5
Borisov's hyperbolic excess speed: 32062.5 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 (30 September 2019) Borisov can be found at

Right Ascension: 9h 26m 33.63s
Declination: +23 06' 56.6"

...which is in Leo, between ε Leonis and λ Leonis.

Last edited by Jerry Abbott; 3 Weeks Ago at 03:07 AM.
 
Old 2 Weeks Ago #8
Jerry Abbott
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(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"
 
Old 3 Days Ago #9
Jerry Abbott
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(Posted here 18 October 2019)

Observations: 424 over 40 days.

ORBITAL ELEMENTS
a = −0.8520721823439664 AU
e = 3.354200627757959
i = 44.05644103535197
Ω = 308.1433928830633
ω = 209.1401668115733
T = 2458826.0726055973 JD

ECLIPTIC CROSSING
Descending node at 10h 8m 23s on 26 October 2019 UTC (JD 2458782.922495)
Borisov mean anomaly: −54.0718714
Borisov eccentric anomaly: −22.173711
Borisov true anomaly: −29.1401642
HEC x = −1.37278511 AU
HEC y = +1.74804954 AU
HEC z = 0
HEC Vx = −12217.1918 m/s
HEC Vy = −30524.4730 m/s
HEC Vz = −27538.9976 m/s
HEC distance: 2.22265970 AU
HEC longitude: 128.143395
HEC latitude: 0
speed relative to the sun: 42888.2224 m/s = 0.000143059711 c
obliquity of the ecliptic: 23.4367145
Geocentric distance: 2.52368659 AU = 20.9888613 light minutes
Geocentric right ascension: 10h 13m 01.04s
Geocentric declination: +11 02′ 23.0″
Angle Sun-Earth-Borisov: 61.2035780
Angle Earth-Sun-Borisov: 95.7182893

PERIHELION
time: 13h 44m 33s on 8 Dec 2019 UTC (JD 2458826.072606)
Borisov mean anomaly: 0
Borisov eccentric anomaly: 0
Borisov true anomaly: 0
HEC x = −1.63420858 AU
HEC y = +0.944373518 AU
HEC z = −0.67922886 AU
HEC Vx = −8465.20338 m/s
HEC Vy = −33817.8892 m/s
HEC Vz = −26652.0051 m/s
HEC distance: 2.00594887 AU
HEC longitude: 149.977319
HEC latitude: −19.7920439
speed relative to the sun: 43882.0997 m/s = 0.000146374929 c
obliquity of the ecliptic: 23.4366991
Geocentric distance: 1.99362582 AU = 16.58048 light minutes
Geocentric right ascension: 11h 28m 23.92s
Geocentric declination: −18 20′ 45.7″
Angle Sun-Earth-Borisov: 76.4380468
Angle Earth-Sun-Borisov: 75.0485896

CLOSEST APPROACH TO MARS
time: 4h 13m on 9 December 2019 UTC (JD 2458826.6755)
Borisov mean anomaly: 0.755488005
Borisov eccentric anomaly: 0.320908239
Borisov true anomaly: 0.436425486
HEC x = −1.63714525 AU
HEC y = +0.932591927 AU
HEC z = −0.688504492 AU
HEC Vx = −8402.60813 m/s
HEC Vy = −33853.8037 m/s
HEC Vz = −26625.8344 m/s
HEC distance: 2.00599369 AU
HEC longitude: 150.332206
HEC latitude: −20.0733988
speed relative to the sun: 43881.8745 m/s = 0.000146374178 c
Distance from Mars: 1.7262528 AU = 14.3568068 light minutes
Angle Sun-Mars-Borisov: 73.7475417
Angle Mars-Sun-Borisov: 55.7060854

CLOSEST APPROACH TO EARTH
time: 3h 49m 11s on 28 December 2019 UTC (JD 2458845.65915)
Borisov mean anomaly: 24.544106
Borisov eccentric anomaly: 10.3454406
Borisov true anomaly: 13.961987
HEC x = −1.71840213 AU
HEC y = +0.556140343 AU
HEC z = −0.975313300 AU
HEC Vx = −6426.76547 m/s
HEC Vy = −34733.2059 m/s
HEC Vz = −25647.8004 m/s
HEC distance: 2.05266509 AU
HEC longitude: 162.066445
HEC latitude: −28.3687833
speed relative to the sun: 43652.1313 m/s = 0.000145607837 c
obliquity of the ecliptic: 23.4366921
Geocentric distance: 1.93631563 AU = 16.103846 light minutes
Geocentric right ascension: 11h 59m 55.10s
Geocentric declination: −33 17′ 13.1″
Angle Sun-Earth-Borisov: 82.4116596
Angle Earth-Sun-Borisov: 69.2373048

EPHEMERIS for December 2019
All positions for 9pm Eastern Standard Time
(date) (right ascension) (declination) (geoc. distance)
1 Dec 11h 17m 28.35s −13 23' 20.7" 2.03913321
6 Dec 11h 25m 54.49s −17 12' 05.1" 2.00288620
A meddlesome waxing moon
11 Dec 11h 34m 13.55s −21 03' 10.5" 1.97459187
Full moon on 12 Dec.
16 Dec 11h 42m 24.40s −24 54' 31.8" 1.95421996
21 Dec 11h 50m 25.68s −28 43' 59.6" 1.94161010
26 Dec 11h 58m 15.66s −32 29' 26.0" 1.93647831
31 Dec 12h 05m 52.27s −36 08' 51.2" 1.93843168

Expected brightest apparent magnitude: +15.3 (in mid-December 2019)
Borisov's hyperbolic excess speed: 32266.7287 m/s
 
Old 3 Days Ago #10
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