118P/Shoemaker-Levy
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	24 Nov 2022	14.4	1.829 AU	1.186 AU	08h26m	+07°49'	114.3°	29.5°	289°
Nearest approach	18 Jan 2023	14.0	1.888 AU	0.916 AU	08h37m	+11°28'	167.2°	6.7°	316°
Today	18 Apr 2024	19.5	3.796 AU	2.885 AU	15h43m	-06°04'	151.1°	7.3°	258°

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 118P/Shoemaker-Levy are:

            e (Eccentricity)                : 0.4537210
            q (Perihelion distance)         : 1.8290810
            i (Inclination)                 : 10.09020
            Ω (Longitude of ascending node) : 142.08320
            ω (Argument of perihelion)      : 314.88640
            L (Longitude of perihelion)     : 97.41615
            B (Latitude of perihelion)      : -7.13048
            T (Time of perihelion passage)  : 2459907.96720
            P (Orbital period in years)     : 6.13

            Epoch                           : 2024 Apr 18
            Reference                       : MPEC 2024-GJ3

            Classification(s):              : Ecliptic; Jupiter family
            Tisserand (Jupiter)             : 2.962
        

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 (12.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 11.45 + 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
2024-04-18 00:00 UT   15 43 47.7   -06 08 39     2.888    3.792  150.1    7.6   259   19.5 
2024-04-18 23:30 UT   15 43 11.4   -06 04 44     2.885    3.796  151.1    7.3   258   19.5 
2024-04-19 00:00 UT   15 43 10.7   -06 04 39     2.885    3.796  151.1    7.3   258   19.5 
2024-04-20 00:00 UT   15 42 32.9   -06 00 41     2.882    3.799  152.1    7.1   257   19.5 
2024-04-21 00:00 UT   15 41 54.4   -05 56 44     2.879    3.803  153.1    6.9   255   19.5 
2024-04-22 00:00 UT   15 41 15.3   -05 52 49     2.877    3.807  154.1    6.6   254   19.5 
2024-04-23 00:00 UT   15 40 35.6   -05 48 56     2.875    3.810  155.1    6.4   253   19.6 
2024-04-24 00:00 UT   15 39 55.2   -05 45 05     2.873    3.814  156.0    6.2   251   19.6 
2024-04-25 00:00 UT   15 39 14.3   -05 41 16     2.871    3.817  156.9    5.9   249   19.6 
2024-04-26 00:00 UT   15 38 32.9   -05 37 29     2.870    3.821  157.8    5.7   248   19.6 
2024-04-27 00:00 UT   15 37 50.9   -05 33 45     2.869    3.824  158.7    5.5   246   19.6 
2024-04-28 00:00 UT   15 37 08.5   -05 30 04     2.868    3.828  159.6    5.3   244   19.6 

    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.