C/2020 H5 (Robinson)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	9 Dec 2020	19.7	9.335 AU	9.793 AU	12h34m	-36°32'	59.7°	5.2°	277°
Nearest approach	11 Apr 2021	19.4	9.360 AU	8.471 AU	12h24m	-34°27'	151.0°	3.0°	29°
Today	13 Jul 2025	21.7	13.049 AU	12.764 AU	14h57m	+14°02'	104.1°	4.3°	117°

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 C/2020 H5 (Robinson) are:

            e (Eccentricity)                : 0.9984420
            q (Perihelion distance)         : 9.3350440
            i (Inclination)                 : 70.22850
            Ω (Longitude of ascending node) : 210.61440
            ω (Argument of perihelion)      : 326.26530
            L (Longitude of perihelion)     : 197.88527
            B (Latitude of perihelion)      : -31.50748
            T (Time of perihelion passage)  : 2459193.46030
            P (Orbital period in years)     : 463792.13

            Epoch                           : 2025 Jul 12
            Reference                       : MPC184409

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

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. (5.00 + 5 log[∆] + 10.00 log[r]).

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
2025-07-13 00:00 UT   14 57 15.0   +14 02 51    12.757   13.047  104.4    4.3   117   21.7 
2025-07-13 09:12 UT   14 57 13.6   +14 02 41    12.764   13.049  104.1    4.3   117   21.7 
2025-07-14 00:00 UT   14 57 11.5   +14 02 23    12.775   13.051  103.6    4.3   117   21.7 
2025-07-15 00:00 UT   14 57 08.3   +14 01 52    12.792   13.054  102.7    4.4   116   21.7 
2025-07-16 00:00 UT   14 57 05.3   +14 01 20    12.810   13.058  101.9    4.4   116   21.7 
2025-07-17 00:00 UT   14 57 02.6   +14 00 46    12.828   13.062  101.1    4.4   115   21.7 
2025-07-18 00:00 UT   14 57 00.3   +14 00 10    12.846   13.065  100.2    4.4   115   21.7 
2025-07-19 00:00 UT   14 56 58.2   +13 59 32    12.864   13.069   99.4    4.4   114   21.7 
2025-07-20 00:00 UT   14 56 56.4   +13 58 52    12.882   13.072   98.6    4.4   114   21.7 
2025-07-21 00:00 UT   14 56 54.9   +13 58 11    12.900   13.076   97.7    4.4   113   21.7 
2025-07-22 00:00 UT   14 56 53.7   +13 57 28    12.918   13.080   96.9    4.4   113   21.7 
2025-07-23 00:00 UT   14 56 52.7   +13 56 43    12.936   13.083   96.1    4.4   113   21.7 

    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.