C/2021 A10 (NEOWISE) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Nearest approach | 9 Feb 2021 | 19.1 | 1.362 AU | 0.575 AU | 12h36m | +68°06' | 119.0° | 39.3° | 233° |
Perihelion | 14 Mar 2021 | 20.6 | 1.267 AU | 1.311 AU | 02h59m | +44°57' | 65.0° | 45.3° | 58° |
Today | 4 Jul 2025 | 35.8 | 13.468 AU | 12.783 AU | 22h33m | -32°29' | 130.6° | 3.3° | 266° |
C/2021 A10 (NEOWISE)- 2025-07-04
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/2021 A10 (NEOWISE) are:
e (Eccentricity) : 0.9858790
q (Perihelion distance) : 1.2667960
i (Inclination) : 151.99530
Ω (Longitude of ascending node) : 188.84100
ω (Argument of perihelion) : 82.64570
L (Longitude of perihelion) : 107.15776
B (Latitude of perihelion) : 27.75432
T (Time of perihelion passage) : 2459288.21620
P (Orbital period in years) : 849.69
Epoch : 2025 Jul 03
Reference : MPEC 2021-N06
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 light curve is based on the absolute magnitude and slope parameter as calculated from an MPEC, or the latest values provided by the minor planet center. (19.00 + 5 log[∆] + 10.00 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
2025-07-04 00:00 UT 22 33 14.7 -32 29 34 12.783 13.468 130.6 3.3 266 35.8
2025-07-04 00:10 UT 22 33 14.6 -32 29 35 12.783 13.468 130.6 3.3 266 35.8
2025-07-05 00:00 UT 22 33 00.7 -32 32 19 12.778 13.474 131.5 3.2 267 35.8
2025-07-06 00:00 UT 22 32 46.3 -32 35 05 12.773 13.480 132.4 3.2 268 35.8
2025-07-07 00:00 UT 22 32 31.7 -32 37 50 12.768 13.486 133.3 3.1 269 35.8
2025-07-08 00:00 UT 22 32 16.8 -32 40 36 12.764 13.492 134.1 3.1 269 35.8
2025-07-09 00:00 UT 22 32 01.5 -32 43 21 12.759 13.498 135.0 3.1 270 35.8
2025-07-10 00:00 UT 22 31 46.0 -32 46 07 12.755 13.504 135.9 3.0 271 35.8
2025-07-11 00:00 UT 22 31 30.2 -32 48 53 12.751 13.510 136.7 3.0 272 35.8
2025-07-12 00:00 UT 22 31 14.2 -32 51 38 12.748 13.516 137.6 2.9 273 35.8
2025-07-13 00:00 UT 22 30 57.9 -32 54 23 12.744 13.522 138.4 2.9 273 35.8
2025-07-14 00:00 UT 22 30 41.3 -32 57 08 12.741 13.528 139.3 2.8 274 35.8
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.