342P/SOHO
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	2 Apr 2026	29.0	3.938 AU	4.161 AU	20h23m	-25°54'	70.3°	13.8°	254°
Perihelion	7 Feb 2027	6.2	0.052 AU	0.947 AU	21h30m	-14°26'	2.0°	139.2°	63°
Nearest approach	8 Feb 2027	7.5	0.077 AU	0.924 AU	21h15m	-14°55'	2.7°	143.2°	273°

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. The light curve is estimated manually by the author. (20.0 + 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 342P/SOHO are:

    e (Eccentricity)                : 0.9829890
    q (Perihelion distance)         : 0.0517220
    i (Inclination)                 : 11.68520
    Ω (Longitude of ascending node) : 73.29340
    ω (Argument of perihelion)      : 27.66840
    L (Longitude of perihelion)     : 100.47128
    B (Latitude of perihelion)      : 5.39650
    T (Time of perihelion passage)  : 2461444.24090
    P (Orbital period in years)     : 5.30

    Epoch                           : 2025 Nov 12
    Reference                       : MPC101101

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); Halley type (P < 200 years); Sunskirter

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-04-01 00:00 UT   20 22 59.5   -25 54 43     4.190    3.945   69.1   13.7   254   29.1 
2026-04-02 00:00 UT   20 23 32.3   -25 54 32     4.168    3.940   70.0   13.8   254   29.1 
2026-04-02 08:06 UT   20 23 43.2   -25 54 29     4.161    3.938   70.3   13.8   254   29.0 
2026-04-03 00:00 UT   20 24 04.4   -25 54 24     4.147    3.934   70.9   13.9   254   29.0 
2026-04-04 00:00 UT   20 24 35.9   -25 54 19     4.126    3.928   71.7   14.0   254   29.0 
2026-04-05 00:00 UT   20 25 06.8   -25 54 17     4.104    3.922   72.6   14.1   254   29.0 
2026-04-06 00:00 UT   20 25 37.0   -25 54 19     4.082    3.917   73.5   14.2   254   29.0 
2026-04-07 00:00 UT   20 26 06.5   -25 54 24     4.061    3.911   74.3   14.3   254   29.0 
2026-04-08 00:00 UT   20 26 35.3   -25 54 33     4.039    3.905   75.2   14.4   254   28.9 
2026-04-09 00:00 UT   20 27 03.4   -25 54 45     4.017    3.899   76.1   14.4   255   28.9 
2026-04-10 00:00 UT   20 27 30.8   -25 55 01     3.995    3.893   76.9   14.5   255   28.9 
2026-04-11 00:00 UT   20 27 57.5   -25 55 20     3.973    3.887   77.8   14.6   255   28.9 
2026-04-12 00:00 UT   20 28 23.4   -25 55 44     3.951    3.881   78.7   14.7   255   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.