C/2021 B3 (NEOWISE) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Nearest approach | 12 Feb 2021 | 18.3 | 2.185 AU | 1.874 AU | 05h54m | -57°53' | 94.5° | 26.8° | 56° |
Perihelion | 9 Mar 2021 | 18.4 | 2.168 AU | 2.031 AU | 05h02m | -36°03' | 84.1° | 27.1° | 89° |
Today | 30 Apr 2025 | 29.8 | 12.018 AU | 12.596 AU | 23h20m | +52°20' | 53.0° | 3.8° | 297° |
C/2021 B3 (NEOWISE)- 2025-04-30
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.)
The orbital elements of C/2021 B3 (NEOWISE) are:
e (Eccentricity) : 0.9366640
q (Perihelion distance) : 2.1675730
i (Inclination) : 119.47650
Ω (Longitude of ascending node) : 67.27930
ω (Argument of perihelion) : 293.59410
L (Longitude of perihelion) : 115.68649
B (Latitude of perihelion) : -52.91886
T (Time of perihelion passage) : 2459282.88270
P (Orbital period in years) : 200.21
Epoch : 2025 Apr 29
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. (13.50 + 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
2025-04-30 00:00 UT 23 20 35.3 +52 18 40 12.595 12.014 52.9 3.8 297 29.8
2025-04-30 13:17 UT 23 20 42.1 +52 20 41 12.596 12.018 53.0 3.8 297 29.8
2025-05-01 00:00 UT 23 20 47.5 +52 22 19 12.597 12.020 53.1 3.8 296 29.8
2025-05-02 00:00 UT 23 20 59.5 +52 25 60 12.599 12.026 53.4 3.9 295 29.8
2025-05-03 00:00 UT 23 21 11.0 +52 29 41 12.600 12.031 53.7 3.9 294 29.8
2025-05-04 00:00 UT 23 21 22.2 +52 33 25 12.602 12.037 54.0 3.9 293 29.8
2025-05-05 00:00 UT 23 21 33.1 +52 37 10 12.603 12.043 54.3 3.9 292 29.8
2025-05-06 00:00 UT 23 21 43.5 +52 40 56 12.604 12.048 54.6 3.9 291 29.8
2025-05-07 00:00 UT 23 21 53.6 +52 44 43 12.605 12.054 54.9 3.9 290 29.8
2025-05-08 00:00 UT 23 22 03.4 +52 48 32 12.606 12.060 55.3 3.9 289 29.8
2025-05-09 00:00 UT 23 22 12.7 +52 52 22 12.606 12.065 55.6 4.0 288 29.8
2025-05-10 00:00 UT 23 22 21.7 +52 56 12 12.607 12.071 55.9 4.0 287 29.8
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.