C/2021 D1 (SWAN) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Perihelion | 27 Feb 2021 | 10.8 | 0.904 AU | 1.720 AU | 23h25m | +12°49' | 23.6° | 26.0° | 28° |
Nearest approach | 14 Mar 2021 | 10.9 | 0.945 AU | 1.680 AU | 00h40m | +22°48' | 29.2° | 30.9° | 33° |
Today | 25 Apr 2024 | 25.6 | 11.114 AU | 10.516 AU | 10h23m | -12°18' | 124.3° | 4.3° | 98° |
C/2021 D1 (SWAN)- 2024-04-25
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 D1 (SWAN) are:
e (Eccentricity) : 0.9910930
q (Perihelion distance) : 0.9043510
i (Inclination) : 31.40270
Ω (Longitude of ascending node) : 311.24310
ω (Argument of perihelion) : 72.32150
L (Longitude of perihelion) : 20.76625
B (Latitude of perihelion) : 29.76498
T (Time of perihelion passage) : 2459273.23030
P (Orbital period in years) : 1023.08
Epoch : 2024 Apr 24
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 (13.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 10.05 + 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
2024-04-25 00:00 UT 10 23 40.5 -12 19 55 10.506 11.111 124.8 4.3 98 25.6
2024-04-25 12:29 UT 10 23 36.3 -12 18 45 10.516 11.114 124.3 4.3 98 25.6
2024-04-26 00:00 UT 10 23 32.5 -12 17 41 10.525 11.118 123.8 4.3 98 25.6
2024-04-27 00:00 UT 10 23 24.9 -12 15 28 10.545 11.124 122.9 4.4 99 25.6
2024-04-28 00:00 UT 10 23 17.5 -12 13 16 10.564 11.131 122.0 4.4 99 25.6
2024-04-29 00:00 UT 10 23 10.6 -12 11 06 10.584 11.138 121.1 4.4 100 25.6
2024-04-30 00:00 UT 10 23 04.0 -12 08 56 10.604 11.145 120.2 4.5 100 25.7
2024-05-01 00:00 UT 10 22 57.7 -12 06 49 10.624 11.151 119.3 4.5 101 25.7
2024-05-02 00:00 UT 10 22 51.8 -12 04 42 10.644 11.158 118.3 4.6 101 25.7
2024-05-03 00:00 UT 10 22 46.3 -12 02 37 10.664 11.165 117.4 4.6 102 25.7
2024-05-04 00:00 UT 10 22 41.1 -12 00 33 10.685 11.172 116.5 4.6 102 25.7
2024-05-05 00:00 UT 10 22 36.3 -11 58 31 10.705 11.178 115.6 4.7 102 25.7
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.