C/2020 J1 (SONEAR) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Perihelion | 17 Apr 2021 | 12.9 | 3.344 AU | 2.589 AU | 16h42m | -36°51' | 131.9° | 12.9° | 291° |
Nearest approach | 16 May 2021 | 12.8 | 3.355 AU | 2.356 AU | 15h24m | -29°18' | 169.7° | 3.1° | 13° |
Today | 2 Oct 2025 | 23.5 | 12.719 AU | 13.084 AU | 09h44m | +51°57' | 66.5° | 4.1° | 312° |
C/2020 J1 (SONEAR)- 2025-10-02
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.)
The orbital elements of C/2020 J1 (SONEAR) are:
e (Eccentricity) : 0.9995020
q (Perihelion distance) : 3.3443390
i (Inclination) : 142.30800
Ω (Longitude of ascending node) : 226.57780
ω (Argument of perihelion) : 341.55750
L (Longitude of perihelion) : 241.36035
B (Latitude of perihelion) : -11.15263
T (Time of perihelion passage) : 2459322.39100
P (Orbital period in years) : 550327.77
Epoch : 2025 Oct 01
Reference : MPEC 2023-KD6
Classification(s): : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)
The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC.
The gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (8.50 + 5 log[∆] + 8.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 4.50 + 5 log[∆] + 12.16 log[r]).
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.
A more printer-friendly version of the same chart can be found further down this page as well.
The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.
A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
Ephemerides:
Date Time RA (2000) DEC (2000) delta radius elong phase PA magn
2025-10-02 00:00 UT 09 43 54.2 +51 55 35 13.090 12.713 65.8 4.1 313 23.5
2025-10-02 21:23 UT 09 44 05.7 +51 57 01 13.084 12.719 66.5 4.1 312 23.5
2025-10-03 00:00 UT 09 44 07.1 +51 57 11 13.084 12.719 66.6 4.1 312 23.5
2025-10-04 00:00 UT 09 44 19.6 +51 58 50 13.077 12.725 67.3 4.2 312 23.5
2025-10-05 00:00 UT 09 44 31.9 +52 00 32 13.070 12.731 68.1 4.2 311 23.5
2025-10-06 00:00 UT 09 44 43.8 +52 02 17 13.063 12.737 68.8 4.2 310 23.5
2025-10-07 00:00 UT 09 44 55.4 +52 04 05 13.056 12.743 69.6 4.2 310 23.5
2025-10-08 00:00 UT 09 45 06.7 +52 05 55 13.049 12.748 70.4 4.2 309 23.5
2025-10-09 00:00 UT 09 45 17.6 +52 07 49 13.042 12.754 71.1 4.3 309 23.5
2025-10-10 00:00 UT 09 45 28.2 +52 09 45 13.035 12.760 71.9 4.3 308 23.5
2025-10-11 00:00 UT 09 45 38.5 +52 11 44 13.027 12.766 72.7 4.3 307 23.5
2025-10-12 00:00 UT 09 45 48.3 +52 13 46 13.020 12.772 73.4 4.3 307 23.5
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.