C/2019 J1 (Lemmon) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Perihelion | 5 Apr 2019 | 17.8 | 2.481 AU | 2.362 AU | 19h25m | -16°31' | 84.9° | 23.7° | 262° |
Nearest approach | 3 Jul 2019 | 17.4 | 2.657 AU | 1.693 AU | 20h29m | -30°42' | 156.5° | 8.8° | 283° |
Today | 6 Jul 2025 | 30.3 | 16.359 AU | 16.879 AU | 03h24m | -01°23' | 57.7° | 3.0° | 242° |
C/2019 J1 (Lemmon)- 2025-07-06
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/2019 J1 (Lemmon) are:
e (Eccentricity) : 0.9626510
q (Perihelion distance) : 2.4814810
i (Inclination) : 24.52220
Ω (Longitude of ascending node) : 98.23640
ω (Argument of perihelion) : 167.56440
L (Longitude of perihelion) : 86.89202
B (Latitude of perihelion) : 5.12776
T (Time of perihelion passage) : 2458579.36870
P (Orbital period in years) : 541.56
Epoch : 2025 Jul 05
Reference : MPEC 2023-A50
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. (12.00 + 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
2025-07-06 00:00 UT 03 24 36.6 -01 23 01 16.879 16.359 57.7 3.0 242 30.3
2025-07-06 00:03 UT 03 24 36.6 -01 23 01 16.879 16.359 57.7 3.0 242 30.3
2025-07-07 00:00 UT 03 24 46.5 -01 23 13 16.871 16.364 58.6 3.0 242 30.3
2025-07-08 00:00 UT 03 24 56.2 -01 23 25 16.863 16.369 59.4 3.1 243 30.3
2025-07-09 00:00 UT 03 25 05.7 -01 23 40 16.854 16.374 60.2 3.1 243 30.3
2025-07-10 00:00 UT 03 25 15.1 -01 23 55 16.846 16.379 61.1 3.1 243 30.3
2025-07-11 00:00 UT 03 25 24.3 -01 24 12 16.837 16.384 61.9 3.1 244 30.3
2025-07-12 00:00 UT 03 25 33.3 -01 24 30 16.829 16.390 62.8 3.2 244 30.3
2025-07-13 00:00 UT 03 25 42.1 -01 24 50 16.820 16.395 63.6 3.2 245 30.3
2025-07-14 00:00 UT 03 25 50.7 -01 25 11 16.811 16.400 64.5 3.2 245 30.3
2025-07-15 00:00 UT 03 25 59.2 -01 25 33 16.802 16.405 65.4 3.2 245 30.3
2025-07-16 00:00 UT 03 26 07.5 -01 25 57 16.793 16.410 66.2 3.2 246 30.3
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.