322P/SOHO
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	26 Jun 2023	20.0	1.457 AU	0.763 AU	12h55m	-29°20'	109.2°	41.2°	107°
Perihelion	21 Aug 2023	6.0	0.050 AU	1.004 AU	09h48m	+13°43'	2.8°	97.4°	299°
Today	11 May 2025	28.9	4.912 AU	3.923 AU	14h37m	-27°49'	167.1°	2.6°	42°

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.)

The orbital elements of 322P/SOHO are:

            e (Eccentricity)                : 0.9799340
            q (Perihelion distance)         : 0.0503390
            i (Inclination)                 : 11.44950
            Ω (Longitude of ascending node) : 351.35420
            ω (Argument of perihelion)      : 57.06740
            L (Longitude of perihelion)     : 47.89396
            B (Latitude of perihelion)      : 9.59058
            T (Time of perihelion passage)  : 2460177.65820
            P (Orbital period in years)     : 3.97

            Epoch                           : 2025 May 10
            Reference                       : MPC102103

            Classification(s):              : Ecliptic; Jupiter family; Sunskirter
            Tisserand (Jupiter)             : 2.345
        

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC. 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. (19.00 + 5 log[∆] + 10.00 log[r]). The additional green curve shows the effect of forward scattering, occurring when the comet is between the earth and the sun, for a gas-to-dust light ratio δ90 of 0.30. (See Marcus 2007)

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.
A more printer-friendly version of the same chart can be found further down this page as well.

The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.

A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-05-11 00:00 UT   14 37 32.5   -27 52 06     3.921    4.912  167.3    2.6    39   28.9 
2025-05-11 11:11 UT   14 37 04.7   -27 49 60     3.923    4.912  167.1    2.6    42   28.9 
2025-05-12 00:00 UT   14 36 33.0   -27 47 34     3.924    4.913  166.8    2.7    44   28.9 
2025-05-13 00:00 UT   14 35 33.9   -27 42 59     3.927    4.914  166.3    2.8    49   28.9 
2025-05-14 00:00 UT   14 34 35.2   -27 38 20     3.930    4.915  165.7    2.9    53   28.9 
2025-05-15 00:00 UT   14 33 36.9   -27 33 38     3.933    4.916  165.0    3.1    57   28.9 
2025-05-16 00:00 UT   14 32 39.0   -27 28 53     3.937    4.917  164.2    3.2    61   28.9 
2025-05-17 00:00 UT   14 31 41.6   -27 24 05     3.941    4.918  163.4    3.4    64   28.9 
2025-05-18 00:00 UT   14 30 44.6   -27 19 14     3.945    4.919  162.6    3.5    67   28.9 
2025-05-19 00:00 UT   14 29 48.2   -27 14 21     3.950    4.920  161.7    3.7    70   28.9 
2025-05-20 00:00 UT   14 28 52.3   -27 09 25     3.955    4.922  160.8    3.9    72   28.9 
2025-05-21 00:00 UT   14 27 57.0   -27 04 27     3.960    4.923  159.8    4.1    74   28.9 

    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.