C/2021 R7 (PANSTARRS) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Perihelion | 16 Apr 2021 | 22.1 | 5.652 AU | 6.632 AU | 01h25m | +21°11' | 11.4° | 2.0° | 344° |
Nearest approach | 30 Sep 2021 | 21.5 | 5.778 AU | 4.791 AU | 00h30m | +13°44' | 169.1° | 1.9° | 185° |
Today | 20 Apr 2024 | 25.1 | 9.387 AU | 9.654 AU | 21h44m | -26°58' | 71.7° | 5.8° | 246° |
C/2021 R7 (PANSTARRS)- 2024-04-20
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 R7 (PANSTARRS) are:
e (Eccentricity) : 0.9934990
q (Perihelion distance) : 5.6517080
i (Inclination) : 158.86350
Ω (Longitude of ascending node) : 170.16860
ω (Argument of perihelion) : 140.31140
L (Longitude of perihelion) : 207.91022
B (Latitude of perihelion) : 13.31348
T (Time of perihelion passage) : 2459321.10580
P (Orbital period in years) : 25632.99
Epoch : 2024 Apr 19
Reference : MPEC 2022-X67
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. (10.50 + 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
2024-04-20 00:00 UT 21 44 50.2 -26 57 54 9.660 9.385 71.2 5.8 246 25.1
2024-04-20 13:04 UT 21 44 51.4 -26 58 55 9.654 9.387 71.7 5.8 246 25.1
2024-04-21 00:00 UT 21 44 52.3 -26 59 48 9.649 9.390 72.1 5.8 246 25.1
2024-04-22 00:00 UT 21 44 54.1 -27 01 44 9.637 9.395 73.1 5.9 246 25.1
2024-04-23 00:00 UT 21 44 55.4 -27 03 44 9.626 9.400 74.0 5.9 246 25.1
2024-04-24 00:00 UT 21 44 56.3 -27 05 46 9.614 9.405 75.0 5.9 247 25.1
2024-04-25 00:00 UT 21 44 56.9 -27 07 51 9.603 9.410 76.0 6.0 247 25.1
2024-04-26 00:00 UT 21 44 57.0 -27 09 58 9.591 9.415 76.9 6.0 247 25.1
2024-04-27 00:00 UT 21 44 56.7 -27 12 09 9.579 9.420 77.9 6.0 247 25.1
2024-04-28 00:00 UT 21 44 55.9 -27 14 21 9.567 9.425 78.8 6.0 248 25.1
2024-04-29 00:00 UT 21 44 54.8 -27 16 37 9.555 9.430 79.8 6.0 248 25.1
2024-04-30 00:00 UT 21 44 53.2 -27 18 55 9.543 9.435 80.8 6.0 248 25.1
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.