C/2019 S4 (Lemmon) |
ephemeris |
date |
magn |
radius |
delta |
ra |
dec |
elong |
phase |
PA |
Nearest approach | 24 Nov 2019 | 19.0 | 3.660 AU | 3.014 AU | 01h34m | +72°38' | 124.1° | 12.9° | 138° |
Perihelion | 8 Apr 2020 | 19.3 | 3.442 AU | 3.820 AU | 23h37m | +65°55' | 60.7° | 14.7° | 334° |
Today | 28 Mar 2024 | 26.8 | 11.525 AU | 10.983 AU | 16h17m | -27°28' | 120.7° | 4.3° | 284° |
C/2019 S4 (Lemmon)- 2024-03-28
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 S4 (Lemmon) are:
e (Eccentricity) : 0.9856650
q (Perihelion distance) : 3.4417340
i (Inclination) : 92.10500
Ω (Longitude of ascending node) : 63.15800
ω (Argument of perihelion) : 71.37230
L (Longitude of perihelion) : 56.93905
B (Latitude of perihelion) : 71.25794
T (Time of perihelion passage) : 2458947.96480
P (Orbital period in years) : 3720.23
Epoch : 2024 Mar 27
Reference : MPEC 2021-S45
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. (11.00 + 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
2024-03-28 00:00 UT 16 17 19.3 -27 27 26 10.989 11.521 120.0 4.3 283 26.8
2024-03-28 15:58 UT 16 17 10.0 -27 28 13 10.983 11.525 120.7 4.3 284 26.8
2024-03-29 00:00 UT 16 17 05.3 -27 28 37 10.980 11.527 121.0 4.3 284 26.8
2024-03-30 00:00 UT 16 16 50.9 -27 29 47 10.971 11.533 122.1 4.2 284 26.8
2024-03-31 00:00 UT 16 16 36.2 -27 30 56 10.962 11.538 123.1 4.2 284 26.8
2024-04-01 00:00 UT 16 16 21.1 -27 32 03 10.954 11.544 124.1 4.1 284 26.8
2024-04-02 00:00 UT 16 16 05.6 -27 33 10 10.945 11.550 125.2 4.1 284 26.8
2024-04-03 00:00 UT 16 15 49.8 -27 34 15 10.937 11.556 126.2 4.0 285 26.8
2024-04-04 00:00 UT 16 15 33.6 -27 35 20 10.929 11.562 127.2 3.9 285 26.8
2024-04-05 00:00 UT 16 15 17.0 -27 36 23 10.922 11.568 128.3 3.9 285 26.8
2024-04-06 00:00 UT 16 15 00.1 -27 37 25 10.914 11.574 129.3 3.8 285 26.8
2024-04-07 00:00 UT 16 14 42.9 -27 38 26 10.907 11.580 130.3 3.8 286 26.8
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.