C/2021 A2 (NEOWISE) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Perihelion | 22 Jan 2021 | 11.4 | 1.413 AU | 0.627 AU | 09h06m | -38°05' | 121.1° | 36.6° | 346° |
Nearest approach | 2 Feb 2021 | 11.1 | 1.424 AU | 0.506 AU | 07h27m | -10°58' | 143.3° | 24.5° | 42° |
Today | 27 Jul 2024 | 55.7 | 11.657 AU | 11.212 AU | 20h46m | +46°59' | 113.6° | 4.6° | 185° |
C/2021 A2 (NEOWISE)- 2024-07-27
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 A2 (NEOWISE) are:
e (Eccentricity) : 0.9938110
q (Perihelion distance) : 1.4133120
i (Inclination) : 107.02360
Ω (Longitude of ascending node) : 125.11770
ω (Argument of perihelion) : 338.77070
L (Longitude of perihelion) : 131.60599
B (Latitude of perihelion) : -20.25724
T (Time of perihelion passage) : 2459236.63090
P (Orbital period in years) : 3450.85
Epoch : 2024 Jul 25
Reference : MPEC 2022-F14
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 (13.50 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 6.21 + 5 log[∆] + 41.49 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
2024-07-27 00:00 UT 20 46 34.6 +46 59 02 11.212 11.657 113.6 4.6 185 55.7
2024-07-27 00:24 UT 20 46 34.1 +46 59 01 11.212 11.657 113.6 4.6 185 55.7
2024-07-28 00:00 UT 20 46 04.9 +46 57 53 11.214 11.664 113.9 4.6 184 55.7
2024-07-29 00:00 UT 20 45 35.2 +46 56 39 11.216 11.670 114.2 4.6 183 55.7
2024-07-30 00:00 UT 20 45 05.6 +46 55 19 11.218 11.677 114.5 4.5 182 55.7
2024-07-31 00:00 UT 20 44 35.9 +46 53 54 11.220 11.683 114.8 4.5 181 55.8
2024-08-01 00:00 UT 20 44 06.3 +46 52 24 11.223 11.690 115.1 4.5 180 55.8
2024-08-02 00:00 UT 20 43 36.7 +46 50 49 11.225 11.696 115.4 4.5 179 55.8
2024-08-03 00:00 UT 20 43 07.1 +46 49 09 11.228 11.703 115.6 4.5 177 55.8
2024-08-04 00:00 UT 20 42 37.6 +46 47 23 11.231 11.710 115.9 4.5 176 55.8
2024-08-05 00:00 UT 20 42 08.2 +46 45 32 11.234 11.716 116.1 4.5 175 55.8
2024-08-06 00:00 UT 20 41 38.9 +46 43 36 11.237 11.723 116.3 4.4 174 55.8
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.