C/2020 H3 (Wierzchos)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	5 Jun 2020	18.2	2.300 AU	1.653 AU	20h06m	+19°31'	117.2°	23.1°	230°
Nearest approach	21 Jun 2020	18.2	2.307 AU	1.614 AU	19h50m	+29°26'	120.9°	22.2°	210°
Today	14 Jul 2025	31.1	14.716 AU	15.584 AU	05h35m	+36°47'	30.3°	2.0°	292°

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 H3 (Wierzchos) are:

            e (Eccentricity)                : 1.0000000
            q (Perihelion distance)         : 2.3002880
            i (Inclination)                 : 62.52920
            Ω (Longitude of ascending node) : 270.62270
            ω (Argument of perihelion)      : 30.44560
            L (Longitude of perihelion)     : 285.79286
            B (Latitude of perihelion)      : 26.71708
            T (Time of perihelion passage)  : 2459006.21610

            Epoch                           : 
            Reference                       : MPEC 2020-HM1

            Classification(s):              : Nearly isotropic; New (a > 10000 AU)
        

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. (13.50 + 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
2025-07-14 00:00 UT   05 34 57.9   +36 47 24    15.585   14.711   29.6    2.0   292   31.1 
2025-07-14 20:25 UT   05 35 12.9   +36 47 29    15.584   14.716   30.3    2.0   292   31.1 
2025-07-15 00:00 UT   05 35 15.5   +36 47 29    15.584   14.716   30.4    2.0   292   31.1 
2025-07-16 00:00 UT   05 35 33.1   +36 47 35    15.582   14.722   31.2    2.0   291   31.1 
2025-07-17 00:00 UT   05 35 50.5   +36 47 41    15.580   14.728   32.0    2.1   290   31.1 
2025-07-18 00:00 UT   05 36 07.7   +36 47 48    15.577   14.734   32.8    2.1   289   31.1 
2025-07-19 00:00 UT   05 36 24.8   +36 47 55    15.575   14.740   33.6    2.2   289   31.1 
2025-07-20 00:00 UT   05 36 41.7   +36 48 03    15.572   14.746   34.4    2.2   288   31.1 
2025-07-21 00:00 UT   05 36 58.4   +36 48 11    15.569   14.751   35.3    2.3   287   31.1 
2025-07-22 00:00 UT   05 37 15.0   +36 48 20    15.566   14.757   36.1    2.3   287   31.2 
2025-07-23 00:00 UT   05 37 31.5   +36 48 29    15.562   14.763   36.9    2.4   286   31.2 
2025-07-24 00:00 UT   05 37 47.7   +36 48 39    15.559   14.769   37.7    2.4   286   31.2 

    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.