C/2020 H5 (Robinson)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	10 Dec 2020	19.7	9.334 AU	9.791 AU	12h34m	-36°32'	59.8°	5.2°	277°
Nearest approach	11 Apr 2021	19.4	9.359 AU	8.470 AU	12h24m	-34°27'	151.0°	3.0°	29°
Today	14 Feb 2026	22.1	13.838 AU	13.721 AU	15h43m	+15°02'	94.7°	4.1°	282°

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. (5.0 + 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/2020 H5 (Robinson) are:

    e (Eccentricity)                : 0.9986790
    q (Perihelion distance)         : 9.3342320
    i (Inclination)                 : 70.21220
    Ω (Longitude of ascending node) : 210.60300
    ω (Argument of perihelion)      : 326.26600
    L (Longitude of perihelion)     : 197.86445
    B (Latitude of perihelion)      : -31.50325
    T (Time of perihelion passage)  : 2459193.59870
    P (Orbital period in years)     : 593968.84

    Epoch                           : 2026 Feb 13
    Reference                       : MPC184409

    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
2026-02-13 00:00 UT   15 43 08.3   +14 59 23    13.732   13.835   93.9    4.1   283   22.1 
2026-02-14 00:00 UT   15 43 13.0   +15 02 49    13.721   13.838   94.7    4.1   282   22.1 
2026-02-14 00:32 UT   15 43 13.1   +15 02 53    13.721   13.838   94.7    4.1   282   22.1 
2026-02-15 00:00 UT   15 43 17.5   +15 06 16    13.711   13.842   95.6    4.1   282   22.1 
2026-02-16 00:00 UT   15 43 21.7   +15 09 44    13.701   13.846   96.4    4.1   281   22.1 
2026-02-17 00:00 UT   15 43 25.6   +15 13 14    13.690   13.849   97.2    4.1   281   22.1 
2026-02-18 00:00 UT   15 43 29.2   +15 16 45    13.680   13.853   98.1    4.1   280   22.1 
2026-02-19 00:00 UT   15 43 32.4   +15 20 17    13.669   13.857   98.9    4.0   280   22.1 
2026-02-20 00:00 UT   15 43 35.4   +15 23 50    13.659   13.861   99.7    4.0   279   22.1 
2026-02-21 00:00 UT   15 43 38.1   +15 27 24    13.649   13.864  100.5    4.0   278   22.1 
2026-02-22 00:00 UT   15 43 40.5   +15 30 59    13.639   13.868  101.4    4.0   278   22.1 
2026-02-23 00:00 UT   15 43 42.5   +15 34 35    13.629   13.872  102.2    4.0   277   22.1 
2026-02-24 00:00 UT   15 43 44.3   +15 38 11    13.619   13.876  103.0    4.0   277   22.1 

    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.