C/2020 H8 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	4 Jun 2020	20.2	4.661 AU	4.090 AU	17h43m	+37°45'	118.5°	11.0°	193°
Nearest approach	18 Jun 2020	20.2	4.662 AU	4.066 AU	17h23m	+36°00'	120.3°	10.8°	173°
Today	6 Nov 2025	27.8	14.087 AU	14.636 AU	13h00m	-68°04'	54.7°	3.3°	212°

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. (10.5 + 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/2020 H8 (PANSTARRS) are:

    e (Eccentricity)                : 0.9920510
    q (Perihelion distance)         : 4.6608870
    i (Inclination)                 : 99.69910
    Ω (Longitude of ascending node) : 68.43230
    ω (Argument of perihelion)      : 128.79420
    L (Longitude of perihelion)     : 80.26918
    B (Latitude of perihelion)      : 50.19796
    T (Time of perihelion passage)  : 2459005.36910
    P (Orbital period in years)     : 14198.23

    Epoch                           : 2025 Nov 05
    Reference                       : MPEC 2021-N06

    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
2025-11-05 00:00 UT   12 59 53.0   -67 59 23    14.625   14.078   54.8    3.3   210   27.8 
2025-11-06 00:00 UT   13 00 20.1   -68 02 11    14.631   14.083   54.7    3.3   211   27.8 
2025-11-06 17:55 UT   13 00 40.3   -68 04 19    14.636   14.087   54.7    3.3   212   27.8 
2025-11-07 00:00 UT   13 00 47.1   -68 05 02    14.638   14.088   54.7    3.3   212   27.8 
2025-11-08 00:00 UT   13 01 13.7   -68 07 56    14.644   14.093   54.6    3.3   213   27.8 
2025-11-09 00:00 UT   13 01 40.2   -68 10 52    14.650   14.099   54.5    3.3   214   27.8 
2025-11-10 00:00 UT   13 02 06.4   -68 13 50    14.656   14.104   54.5    3.3   215   27.8 
2025-11-11 00:00 UT   13 02 32.3   -68 16 51    14.661   14.109   54.5    3.3   216   27.8 
2025-11-12 00:00 UT   13 02 58.0   -68 19 54    14.667   14.114   54.4    3.3   218   27.8 
2025-11-13 00:00 UT   13 03 23.4   -68 22 60    14.672   14.120   54.4    3.3   219   27.8 
2025-11-14 00:00 UT   13 03 48.4   -68 26 07    14.677   14.125   54.4    3.3   220   27.8 
2025-11-15 00:00 UT   13 04 13.2   -68 29 18    14.682   14.130   54.4    3.3   221   27.8 
2025-11-16 00:00 UT   13 04 37.7   -68 32 30    14.687   14.135   54.4    3.3   222   27.8 

    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.