C/2024 S1 (ATLAS) - DISINTEGRATED
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	23 Oct 2024	8.9	0.305 AU	0.879 AU	12h46m	-18°16'	17.4°	103.3°	250°
Disintegration	28 Oct 2024	2.1	0.041 AU	0.958 AU	14h07m	-14°14'	1.3°	147.1°	209°
Perihelion	28 Oct 2024	3.8	0.008 AU	0.995 AU	14h12m	-13°05'	0.5°	81.7°	78°
Today	18 Jul 2026	-	7.984 AU	8.835 AU	07h03m	-08°04'	31.3°	3.8°	202°

This comet is a sungrazer. Although it may become very bright at perihelion, this will only be for a very short period very close to the sun.

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 12.9 + 5 log[∆] + 6.9 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 S1 (ATLAS) are:

    e (Eccentricity)                : 0.9999050
    q (Perihelion distance)         : 0.0079340
    i (Inclination)                 : 142.31480
    Ω (Longitude of ascending node) : 348.63100
    ω (Argument of perihelion)      : 70.32850
    L (Longitude of perihelion)     : 282.94112
    B (Latitude of perihelion)      : 35.14479
    T (Time of perihelion passage)  : 2460611.78340
    P (Orbital period in years)     : 763.23

    Epoch                           : 2026 Jul 17
    Reference                       : MPEC 2026-O09

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years); Sungrazer; Kreutz

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-07-17 00:00 UT   07 02 25.1   -08 01 52     8.824    7.971   31.0    3.8   199   23.8 
2026-07-18 00:00 UT   07 02 50.5   -08 03 18     8.831    7.979   31.2    3.8   201   23.8 
2026-07-18 14:48 UT   07 03 06.0   -08 04 12     8.835    7.984   31.3    3.8   202   23.8 
2026-07-19 00:00 UT   07 03 15.7   -08 04 46     8.837    7.988   31.4    3.8   202   23.8 
2026-07-20 00:00 UT   07 03 40.8   -08 06 18     8.843    7.996   31.6    3.8   204   23.8 
2026-07-21 00:00 UT   07 04 05.7   -08 07 52     8.849    8.004   31.8    3.8   205   23.9 
2026-07-22 00:00 UT   07 04 30.6   -08 09 30     8.855    8.013   32.1    3.9   207   23.9 
2026-07-23 00:00 UT   07 04 55.2   -08 11 10     8.861    8.021   32.3    3.9   208   23.9 
2026-07-24 00:00 UT   07 05 19.8   -08 12 54     8.866    8.030   32.6    3.9   210   23.9 
2026-07-25 00:00 UT   07 05 44.2   -08 14 40     8.871    8.038   32.9    3.9   211   23.9 
2026-07-26 00:00 UT   07 06 08.4   -08 16 29     8.876    8.046   33.2    4.0   213   23.9 
2026-07-27 00:00 UT   07 06 32.5   -08 18 21     8.881    8.055   33.6    4.0   214   23.9 
2026-07-28 00:00 UT   07 06 56.5   -08 20 15     8.885    8.063   33.9    4.0   216   23.9 

    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.