C/2023 F2 (SOHO)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	17 Mar 2023	12.9	0.253 AU	0.942 AU	23h15m	+11°03'	14.7°	94.7°	329°
Perihelion	21 Mar 2023	5.6	0.034 AU	0.999 AU	23h58m	-01°51'	1.9°	84.7°	194°
Today	24 Sep 2026	35.1	11.751 AU	11.776 AU	06h45m	+67°16'	86.2°	4.9°	280°

This comet is a sunskirter. 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 19.0 + 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 F2 (SOHO) are:

    e (Eccentricity)                : 1.0118240
    q (Perihelion distance)         : 0.0336150
    i (Inclination)                 : 72.63810
    Ω (Longitude of ascending node) : 71.55230
    ω (Argument of perihelion)      : 237.59990
    L (Longitude of perihelion)     : 96.73573
    B (Latitude of perihelion)      : -53.69326
    T (Time of perihelion passage)  : 2460024.73630

    Epoch                           : 2026 May 29
    Reference                       : MPC194184

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-09-23 00:00 UT   06 44 57.0   +67 12 45    11.819   11.779   85.4    4.9   281   35.1 
2026-09-24 00:00 UT   06 45 10.1   +67 15 51    11.782   11.755   86.1    4.9   280   35.1 
2026-09-24 03:59 UT   06 45 12.2   +67 16 22    11.776   11.751   86.2    4.9   280   35.1 
2026-09-25 00:00 UT   06 45 22.5   +67 18 60    11.746   11.731   86.8    4.9   279   35.0 
2026-09-26 00:00 UT   06 45 34.1   +67 22 10    11.710   11.707   87.5    4.9   279   35.0 
2026-09-27 00:00 UT   06 45 45.0   +67 25 22    11.673   11.683   88.2    4.9   278   35.0 
2026-09-28 00:00 UT   06 45 55.1   +67 28 37    11.637   11.659   88.9    4.9   277   35.0 
2026-09-29 00:00 UT   06 46 04.4   +67 31 53    11.601   11.634   89.6    4.9   277   35.0 
2026-09-30 00:00 UT   06 46 12.9   +67 35 11    11.564   11.610   90.2    4.9   276   35.0 
2026-10-01 00:00 UT   06 46 20.5   +67 38 30    11.528   11.586   90.9    5.0   275   34.9 
2026-10-02 00:00 UT   06 46 27.4   +67 41 52    11.492   11.562   91.6    5.0   275   34.9 
2026-10-03 00:00 UT   06 46 33.4   +67 45 15    11.455   11.538   92.3    5.0   274   34.9 
2026-10-04 00:00 UT   06 46 38.5   +67 48 40    11.419   11.514   93.0    5.0   273   34.9 

    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.