342P/SOHO
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	23 Feb 2026	29.6	4.144 AU	4.871 AU	19h57m	-26°27'	38.6°	8.6°	252°
Perihelion	7 Feb 2027	6.0	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
2026-02-22 00:00 UT   19 56 14.0   -26 29 55     4.892    4.151   37.5    8.3   251   29.6 
2026-02-23 00:00 UT   19 57 03.0   -26 28 31     4.877    4.146   38.3    8.5   252   29.6 
2026-02-23 09:14 UT   19 57 21.8   -26 27 59     4.871    4.144   38.6    8.6   252   29.6 
2026-02-24 00:00 UT   19 57 51.7   -26 27 08     4.861    4.140   39.1    8.7   252   29.6 
2026-02-25 00:00 UT   19 58 40.2   -26 25 46     4.846    4.135   39.9    8.8   252   29.6 
2026-02-26 00:00 UT   19 59 28.3   -26 24 25     4.830    4.130   40.7    9.0   252   29.6 
2026-02-27 00:00 UT   20 00 16.2   -26 23 06     4.814    4.125   41.5    9.2   252   29.6 
2026-02-28 00:00 UT   20 01 03.8   -26 21 47     4.797    4.120   42.4    9.3   252   29.6 
2026-03-01 00:00 UT   20 01 51.1   -26 20 29     4.781    4.115   43.2    9.5   252   29.5 
2026-03-02 00:00 UT   20 02 38.1   -26 19 13     4.764    4.109   44.0    9.6   252   29.5 
2026-03-03 00:00 UT   20 03 24.7   -26 17 58     4.748    4.104   44.8    9.8   252   29.5 
2026-03-04 00:00 UT   20 04 11.1   -26 16 44     4.731    4.099   45.6   10.0   252   29.5 
2026-03-05 00:00 UT   20 04 57.1   -26 15 31     4.713    4.094   46.5   10.1   253   29.5 

    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.