C/2023 V1 (Lemmon)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	13 Jul 2025	19.1	5.093 AU	5.011 AU	16h05m	+59°17'	88.8°	11.5°	134°
Nearest approach	12 Apr 2026	19.3	5.497 AU	4.829 AU	15h09m	+37°29'	127.5°	8.3°	214°
Today	17 Apr 2026	19.3	5.512 AU	4.833 AU	15h02m	+37°32'	128.4°	8.2°	206°

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.)

Light curve

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS. 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. (8.5 + 5 log[∆] + 10.0 log[r]). An additional green curve is displayed when an increase in apparent brightness is expected due to forward scattering of sunlight, which occurs when a dust-rich comet is located between the Earth and the Sun. (See Marcus 2007)

Charts

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.

Orbital elements

The orbital elements of C/2023 V1 (Lemmon) are:

    e (Eccentricity)                : 1.0003640
    q (Perihelion distance)         : 5.0926450
    i (Inclination)                 : 102.00820
    Ω (Longitude of ascending node) : 15.05280
    ω (Argument of perihelion)      : 103.32120
    L (Longitude of perihelion)     : 56.35755
    B (Latitude of perihelion)      : 72.13842
    T (Time of perihelion passage)  : 2460869.57060

    Epoch                           : 2026 Apr 16
    Reference                       : MPEC 2026-FR0

    Classification(s):              : Nearly isotropic; New (a > 10000 AU)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-04-16 00:00 UT   15 04 15.3   +37 32 13     4.831    5.507  128.2    8.2   208   19.3 
2026-04-17 00:00 UT   15 02 55.9   +37 32 35     4.832    5.510  128.3    8.2   207   19.3 
2026-04-17 13:59 UT   15 02 09.4   +37 32 42     4.833    5.512  128.4    8.2   206   19.3 
2026-04-18 00:00 UT   15 01 36.0   +37 32 44     4.833    5.513  128.4    8.2   205   19.3 
2026-04-19 00:00 UT   15 00 15.9   +37 32 42     4.835    5.516  128.5    8.2   203   19.3 
2026-04-20 00:00 UT   14 58 55.5   +37 32 27     4.837    5.519  128.5    8.2   202   19.3 
2026-04-21 00:00 UT   14 57 34.9   +37 31 59     4.839    5.522  128.6    8.2   200   19.3 
2026-04-22 00:00 UT   14 56 14.1   +37 31 19     4.842    5.525  128.6    8.2   199   19.3 
2026-04-23 00:00 UT   14 54 53.2   +37 30 26     4.844    5.528  128.6    8.2   197   19.4 
2026-04-24 00:00 UT   14 53 32.2   +37 29 21     4.847    5.531  128.6    8.2   195   19.4 
2026-04-25 00:00 UT   14 52 11.1   +37 28 02     4.851    5.533  128.5    8.2   194   19.4 
2026-04-26 00:00 UT   14 50 50.1   +37 26 31     4.854    5.536  128.4    8.2   192   19.4 
2026-04-27 00:00 UT   14 49 29.0   +37 24 48     4.858    5.539  128.3    8.2   190   19.4 

    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.