|
2I/Borisov |
| ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
| Perihelion | 9 Dec 2019 | 15.6 | 1.998 AU | 1.974 AU td > | 11h27m | -18°35' | 77.0° | 28.7° | 290° |
| Nearest approach | 28 Dec 2019 | 15.7 | 2.042 AU | 1.919 AU td > | 11h58m | -33°16' | 82.7° | 28.5° | 293° |
| Today | 30 Oct 2025 | 35.6 | 42.273 AU | 42.788 AU td > | 17h54m | -53°42' | 57.8° | 1.1° | 112° |
2I/Borisov- 2025-10-30
astro.vanbuitenen.nl
The interactive orbit chart above shows the comet's path through the solar system and its position at the given date.
Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below.
(Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)
Light curve
The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS.
This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 11.2 + 5 log[∆] + 10.0 log[r]). An additional green curve is displayed when an increase in apparent brightness is expected due to forward scattering of sunlight, which occurs when a dust-rich comet is located between the Earth and the Sun. (See Marcus 2007)
Charts
The all-sky chart below shows the path of the comet over the same period as the light curve. The comet's current position is marked yellow.
The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
Orbital elements
The orbital elements of 2I/Borisov are:
e (Eccentricity) : 3.3459520
q (Perihelion distance) : 1.9977240
i (Inclination) : 44.26240
Ω (Longitude of ascending node) : 307.80240
ω (Argument of perihelion) : 209.29110
L (Longitude of perihelion) : 329.68965
B (Latitude of perihelion) : -19.96632
T (Time of perihelion passage) : 2458826.55720
Epoch : 2025 Nov 21
Reference : MPEC 2025-R69
Classification(s): : Interstellar
Ephemerides
Date Time RA (2000) DEC (2000) delta radius elong phase PA magn
2025-10-29 00:00 UT 17 54 25.0 -53 42 58 42.737 42.241 59.2 1.2 111 35.6
2025-10-30 00:00 UT 17 54 31.5 -53 42 23 42.768 42.260 58.4 1.1 112 35.6
2025-10-30 15:45 UT 17 54 35.9 -53 42 00 42.788 42.273 57.8 1.1 112 35.6
2025-10-31 00:00 UT 17 54 38.2 -53 41 48 42.799 42.279 57.6 1.1 112 35.6
2025-11-01 00:00 UT 17 54 45.0 -53 41 14 42.829 42.298 56.8 1.1 113 35.6
2025-11-02 00:00 UT 17 54 51.9 -53 40 40 42.859 42.317 56.0 1.1 114 35.6
2025-11-03 00:00 UT 17 54 58.9 -53 40 07 42.890 42.336 55.2 1.1 114 35.6
2025-11-04 00:00 UT 17 55 06.0 -53 39 35 42.920 42.355 54.4 1.1 115 35.6
2025-11-05 00:00 UT 17 55 13.2 -53 39 02 42.949 42.374 53.7 1.1 116 35.6
2025-11-06 00:00 UT 17 55 20.5 -53 38 31 42.979 42.393 52.9 1.1 117 35.6
2025-11-07 00:00 UT 17 55 28.0 -53 37 60 43.008 42.412 52.1 1.1 117 35.6
2025-11-08 00:00 UT 17 55 35.5 -53 37 29 43.038 42.431 51.4 1.0 118 35.6
2025-11-09 00:00 UT 17 55 43.1 -53 36 59 43.067 42.450 50.6 1.0 119 35.6
Terminology:
delta: distance between comet and earth in AU
radius: distance between comet and sun in AU
magn: magnitude (brightness) estimate
ra: right ascension in hours (24h = 360deg)
dec: declination in degrees
elong: elongation in degrees (angle sun-earth-comet)
phase: phase angle in degrees (angle sun-comet-earth)
AU: Astronomical Unit (mean distance between earth and sun: 149597870.7 km
Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or the MPC (Minor Planet Center)
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.