C/2022 U1 (Leonard) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Nearest approach | 28 Oct 2023 | 16.8 | 4.385 AU | 3.683 AU | 23h54m | +56°09' | 129.7° | 10.0° | 136° |
Perihelion | 26 Mar 2024 | 17.3 | 4.202 AU | 4.896 AU | 22h49m | +38°06' | 41.6° | 9.1° | 324° |
Today | 1 Jul 2025 | 18.5 | 5.647 AU | 4.802 AU | 18h34m | +13°54' | 143.0° | 6.2° | 177° |
C/2022 U1 (Leonard)- 2025-07-01
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/2022 U1 (Leonard) are:
e (Eccentricity) : 1.0002340
q (Perihelion distance) : 4.2022660
i (Inclination) : 128.14790
Ω (Longitude of ascending node) : 72.52800
ω (Argument of perihelion) : 78.61340
L (Longitude of perihelion) : 0.58597
B (Latitude of perihelion) : 50.43839
T (Time of perihelion passage) : 2460395.59810
Epoch : 2025 Jun 30
Reference : MPEC 2025-MC0
Classification(s): : Nearly isotropic; New (a > 10000 AU)
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 (8.50 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 7.57 + 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
2025-07-01 00:00 UT 18 35 44.5 +13 59 10 4.798 5.642 142.9 6.2 179 18.5
2025-07-01 19:34 UT 18 34 49.8 +13 54 24 4.802 5.647 143.0 6.2 177 18.5
2025-07-02 00:00 UT 18 34 37.4 +13 53 18 4.802 5.648 143.0 6.2 177 18.5
2025-07-03 00:00 UT 18 33 30.5 +13 47 19 4.807 5.653 143.1 6.2 175 18.5
2025-07-04 00:00 UT 18 32 23.8 +13 41 11 4.812 5.658 143.1 6.2 172 18.5
2025-07-05 00:00 UT 18 31 17.4 +13 34 56 4.817 5.663 143.1 6.2 170 18.5
2025-07-06 00:00 UT 18 30 11.3 +13 28 33 4.823 5.668 143.1 6.2 168 18.5
2025-07-07 00:00 UT 18 29 05.5 +13 22 04 4.828 5.674 143.0 6.2 166 18.5
2025-07-08 00:00 UT 18 27 60.0 +13 15 26 4.835 5.679 142.9 6.2 164 18.5
2025-07-09 00:00 UT 18 26 54.9 +13 08 42 4.841 5.684 142.8 6.2 162 18.5
2025-07-10 00:00 UT 18 25 50.2 +13 01 52 4.848 5.689 142.6 6.2 160 18.5
2025-07-11 00:00 UT 18 24 45.9 +12 54 54 4.855 5.694 142.4 6.3 159 18.6
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.