A/2024 D1
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	8 Nov 2025	20.2	8.306 AU	8.097 AU	09h48m	+63°35'	98.8°	6.8°	290°
Nearest approach	9 Nov 2027	19.1	6.694 AU	5.943 AU	01h20m	+56°36'	136.3°	5.9°	146°
Perihelion	3 Dec 2027	19.1	6.692 AU	6.034 AU	00h55m	+51°58'	128.4°	6.6°	104°

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 displayed light curve is calculated under the assumption that the object remains inactive. (H=10.60; G=.15).

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 A/2024 D1 are:

    e (Eccentricity)                : 0.9995010
    q (Perihelion distance)         : 6.6920580
    i (Inclination)                 : 132.44860
    Ω (Longitude of ascending node) : 179.65670
    ω (Argument of perihelion)      : 125.78900
    L (Longitude of perihelion)     : 222.76912
    B (Latitude of perihelion)      : 36.76634
    T (Time of perihelion passage)  : 2461742.97060

    Epoch                           : 2025 Nov 07
    Reference                       : MPC185658

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-11-07 00:00 UT   09 48 29.4   +63 26 19     8.116    8.310   97.9    6.8   291   20.3 
2025-11-08 00:00 UT   09 48 23.7   +63 34 09     8.100    8.307   98.6    6.8   290   20.2 
2025-11-08 04:23 UT   09 48 22.5   +63 35 35     8.097    8.306   98.8    6.8   290   20.2 
2025-11-09 00:00 UT   09 48 16.7   +63 42 04     8.084    8.303   99.4    6.8   289   20.2 
2025-11-10 00:00 UT   09 48 08.7   +63 50 03     8.068    8.299  100.1    6.7   288   20.2 
2025-11-11 00:00 UT   09 47 59.4   +63 58 06     8.052    8.295  100.8    6.7   287   20.2 
2025-11-12 00:00 UT   09 47 48.8   +64 06 13     8.037    8.292  101.6    6.7   287   20.2 
2025-11-13 00:00 UT   09 47 37.1   +64 14 25     8.021    8.288  102.3    6.7   286   20.2 
2025-11-14 00:00 UT   09 47 24.0   +64 22 40     8.005    8.284  103.0    6.7   285   20.2 
2025-11-15 00:00 UT   09 47 09.6   +64 30 59     7.990    8.281  103.7    6.7   284   20.2 
2025-11-16 00:00 UT   09 46 53.9   +64 39 22     7.975    8.277  104.4    6.6   283   20.2 
2025-11-17 00:00 UT   09 46 36.7   +64 47 49     7.959    8.273  105.2    6.6   282   20.2 
2025-11-18 00:00 UT   09 46 18.2   +64 56 18     7.944    8.269  105.9    6.6   281   20.2 

    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.