C/2023 X2 (Lemmon)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	31 Oct 2024	18.3	5.999 AU	5.243 AU	04h52m	+43°50'	136.2°	6.6°	239°
Nearest approach	11 Dec 2025	17.5	5.093 AU	4.689 AU	15h57m	+85°40'	108.9°	10.5°	342°
Perihelion	27 Dec 2025	17.5	5.092 AU	4.707 AU	18h09m	+84°16'	107.6°	10.6°	357°

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/2023 X2 (Lemmon) are:

            e (Eccentricity)                : 1.0012520
            q (Perihelion distance)         : 5.0917620
            i (Inclination)                 : 76.99900
            Ω (Longitude of ascending node) : 66.31210
            ω (Argument of perihelion)      : 64.65290
            L (Longitude of perihelion)     : 91.71574
            B (Latitude of perihelion)      : 61.71057
            T (Time of perihelion passage)  : 2461036.75970

            Epoch                           : 2024 Oct 29
            Reference                       : MPEC 2024-TD8

            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 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. (8.50 + 5 log[∆] + 8.00 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
2024-10-31 00:00 UT   04 52 40.7   +43 50 05     5.244    6.000  136.2    6.6   239   18.3 
2024-10-31 01:09 UT   04 52 38.6   +43 50 27     5.243    5.999  136.2    6.6   239   18.3 
2024-11-01 00:00 UT   04 51 55.9   +43 57 34     5.231    5.996  137.1    6.5   238   18.3 
2024-11-02 00:00 UT   04 51 09.9   +44 04 59     5.218    5.992  138.0    6.4   237   18.3 
2024-11-03 00:00 UT   04 50 22.9   +44 12 21     5.206    5.988  138.8    6.3   236   18.3 
2024-11-04 00:00 UT   04 49 35.0   +44 19 39     5.193    5.984  139.7    6.2   235   18.3 
2024-11-05 00:00 UT   04 48 45.9   +44 26 54     5.181    5.980  140.6    6.0   233   18.3 
2024-11-06 00:00 UT   04 47 55.9   +44 34 05     5.170    5.976  141.4    5.9   232   18.3 
2024-11-07 00:00 UT   04 47 05.0   +44 41 11     5.158    5.973  142.3    5.8   231   18.3 
2024-11-08 00:00 UT   04 46 13.0   +44 48 14     5.147    5.969  143.1    5.7   229   18.3 
2024-11-09 00:00 UT   04 45 20.1   +44 55 12     5.136    5.965  143.9    5.6   228   18.3 
2024-11-10 00:00 UT   04 44 26.3   +45 02 05     5.126    5.961  144.7    5.5   226   18.3 

    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.