C/2024 L5 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	10 Mar 2025	15.7	3.434 AU	2.747 AU	14h14m	-30°12'	126.7°	13.4°	302°
Nearest approach	10 Apr 2025	15.5	3.446 AU	2.475 AU	12h52m	-23°47'	163.3°	4.8°	20°
Today	4 Apr 2026	19.0	4.943 AU	4.401 AU	08h56m	+16°29'	117.5°	10.3°	106°

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. This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 5.5 + 5 log[∆] + 14.9 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/2024 L5 (ATLAS) are:

    e (Eccentricity)                : 1.0374360
    q (Perihelion distance)         : 3.4337930
    i (Inclination)                 : 166.57560
    Ω (Longitude of ascending node) : 139.17610
    ω (Argument of perihelion)      : 290.56170
    L (Longitude of perihelion)     : 208.08698
    B (Latitude of perihelion)      : -12.55473
    T (Time of perihelion passage)  : 2460745.09220

    Epoch                           : 2026 Apr 03
    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
2026-04-03 00:00 UT   08 57 15.4   +16 21 48     4.369    4.934  119.2   10.2   106   19.0 
2026-04-04 00:00 UT   08 56 26.6   +16 27 08     4.391    4.941  118.0   10.3   106   19.0 
2026-04-04 10:45 UT   08 56 05.1   +16 29 28     4.401    4.943  117.5   10.3   106   19.0 
2026-04-05 00:00 UT   08 55 39.1   +16 32 20     4.414    4.947  116.8   10.4   106   19.1 
2026-04-06 00:00 UT   08 54 52.8   +16 37 25     4.437    4.953  115.6   10.5   106   19.1 
2026-04-07 00:00 UT   08 54 07.8   +16 42 23     4.460    4.959  114.5   10.6   106   19.1 
2026-04-08 00:00 UT   08 53 24.0   +16 47 14     4.484    4.965  113.3   10.7   106   19.1 
2026-04-09 00:00 UT   08 52 41.5   +16 51 58     4.507    4.971  112.1   10.8   106   19.1 
2026-04-10 00:00 UT   08 52 00.2   +16 56 36     4.531    4.978  111.0   10.8   105   19.2 
2026-04-11 00:00 UT   08 51 20.1   +17 01 07     4.554    4.984  109.8   10.9   105   19.2 
2026-04-12 00:00 UT   08 50 41.3   +17 05 31     4.578    4.990  108.6   11.0   105   19.2 
2026-04-13 00:00 UT   08 50 03.6   +17 09 48     4.602    4.996  107.5   11.0   105   19.2 
2026-04-14 00:00 UT   08 49 27.2   +17 13 60     4.626    5.003  106.4   11.1   105   19.2 

    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.