|
A/2020 H9 |
| ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
| Perihelion | 21 Dec 2019 | 22.4 | 2.561 AU | 3.422 AU | 16h53m | -44°23' | 24.6° | 9.2° | 217° |
| Nearest approach | 22 Apr 2020 | 21.2 | 2.872 AU | 1.887 AU | 14h32m | -24°32' | 165.7° | 5.0° | 327° |
| Today | 9 Dec 2025 | 29.5 | 16.213 AU | 15.775 AU | 10h21m | +57°45' | 114.8° | 3.2° | 274° |
A/2020 H9- 2025-12-09
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.
The displayed light curve is calculated under the assumption that the object remains inactive. (H=17.10; G=.15).
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 A/2020 H9 are:
e (Eccentricity) : 0.9923700
q (Perihelion distance) : 2.5605440
i (Inclination) : 137.87240
Ω (Longitude of ascending node) : 213.09360
ω (Argument of perihelion) : 312.57760
L (Longitude of perihelion) : 252.00318
B (Latitude of perihelion) : -29.59985
T (Time of perihelion passage) : 2458839.13360
P (Orbital period in years) : 6147.68
Epoch : 2025 Nov 12
Reference : MPEC 2022-ED3
Classification(s): : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)
Ephemerides
Date Time RA (2000) DEC (2000) delta radius elong phase PA magn
2025-12-08 00:00 UT 10 22 06.4 +57 40 55 15.782 16.205 113.8 3.2 275 29.5
2025-12-09 00:00 UT 10 21 56.7 +57 44 10 15.777 16.211 114.5 3.2 274 29.5
2025-12-09 09:39 UT 10 21 52.7 +57 45 28 15.775 16.213 114.8 3.2 274 29.5
2025-12-10 00:00 UT 10 21 46.6 +57 47 25 15.772 16.216 115.2 3.2 273 29.5
2025-12-11 00:00 UT 10 21 35.9 +57 50 41 15.767 16.222 115.8 3.1 273 29.5
2025-12-12 00:00 UT 10 21 24.8 +57 53 58 15.763 16.227 116.5 3.1 272 29.5
2025-12-13 00:00 UT 10 21 13.2 +57 57 14 15.758 16.232 117.2 3.1 271 29.5
2025-12-14 00:00 UT 10 21 01.0 +58 00 30 15.754 16.238 117.9 3.1 270 29.5
2025-12-15 00:00 UT 10 20 48.4 +58 03 47 15.750 16.243 118.5 3.1 269 29.4
2025-12-16 00:00 UT 10 20 35.3 +58 07 03 15.746 16.249 119.2 3.0 268 29.4
2025-12-17 00:00 UT 10 20 21.8 +58 10 19 15.742 16.254 119.8 3.0 267 29.4
2025-12-18 00:00 UT 10 20 07.7 +58 13 35 15.738 16.260 120.5 3.0 266 29.4
2025-12-19 00:00 UT 10 19 53.1 +58 16 51 15.735 16.265 121.1 3.0 265 29.4
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.
