C/2022 H1 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	8 May 2023	19.2	7.847 AU	7.056 AU	13h25m	-53°24'	139.2°	4.8°	36°
Perihelion	18 Jan 2024	19.4	7.689 AU	8.136 AU	15h42m	-62°27'	59.8°	6.3°	256°
Today	15 Jan 2026	20.4	8.878 AU	9.576 AU	21h34m	-59°19'	42.7°	4.3°	142°

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 based on the absolute magnitude and slope parameter as calculated from an MPEC, or the latest values provided by the minor planet center. (6.0 + 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/2022 H1 (PANSTARRS) are:

    e (Eccentricity)                : 0.9910060
    q (Perihelion distance)         : 7.6886040
    i (Inclination)                 : 49.86280
    Ω (Longitude of ascending node) : 6.31230
    ω (Argument of perihelion)      : 246.28970
    L (Longitude of perihelion)     : 62.04545
    B (Latitude of perihelion)      : -44.42472
    T (Time of perihelion passage)  : 2460327.99990
    P (Orbital period in years)     : 24994.35

    Epoch                           : 2026 Jan 14
    Reference                       : MPC185656

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-01-14 00:00 UT   21 32 51.5   -59 28 36     9.567    8.873   42.9    4.3   140   20.4 
2026-01-15 00:00 UT   21 33 48.5   -59 23 25     9.573    8.876   42.8    4.3   141   20.4 
2026-01-15 15:58 UT   21 34 26.5   -59 19 60     9.576    8.878   42.7    4.3   142   20.4 
2026-01-16 00:00 UT   21 34 45.6   -59 18 17     9.578    8.879   42.6    4.3   142   20.4 
2026-01-17 00:00 UT   21 35 42.6   -59 13 11     9.582    8.882   42.5    4.3   144   20.4 
2026-01-18 00:00 UT   21 36 39.7   -59 08 07     9.587    8.885   42.3    4.3   145   20.4 
2026-01-19 00:00 UT   21 37 36.7   -59 03 05     9.592    8.888   42.2    4.3   146   20.4 
2026-01-20 00:00 UT   21 38 33.8   -58 58 06     9.596    8.891   42.1    4.3   147   20.4 
2026-01-21 00:00 UT   21 39 30.8   -58 53 10     9.600    8.894   42.0    4.2   148   20.4 
2026-01-22 00:00 UT   21 40 27.9   -58 48 16     9.604    8.897   41.9    4.2   149   20.4 
2026-01-23 00:00 UT   21 41 24.8   -58 43 24     9.608    8.900   41.9    4.2   150   20.4 
2026-01-24 00:00 UT   21 42 21.8   -58 38 34     9.612    8.903   41.8    4.2   152   20.4 
2026-01-25 00:00 UT   21 43 18.7   -58 33 48     9.615    8.906   41.8    4.2   153   20.4 

    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.