C/2020 K8 (Catalina-ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	15 Aug 2020	14.9	0.870 AU	0.573 AU	05h31m	+27°15'	59.0°	86.5°	270°
Perihelion	15 Sep 2020	15.5	0.472 AU	1.090 AU	09h52m	-00°46'	25.6°	67.2°	262°
Today	3 Jul 2025	25.5	15.546 AU	14.912 AU	15h54m	+08°26'	127.0°	3.0°	127°

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 K8 (Catalina-ATLAS) are:

            e (Eccentricity)                : 1.0003180
            q (Perihelion distance)         : 0.4715120
            i (Inclination)                 : 31.38150
            Ω (Longitude of ascending node) : 181.30210
            ω (Argument of perihelion)      : 260.16040
            L (Longitude of perihelion)     : 259.81816
            B (Latitude of perihelion)      : -30.86881
            T (Time of perihelion passage)  : 2459108.20230

            Epoch                           : 2025 Jul 02
            Reference                       : MPEC 2021-P47

            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 gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (15.00 + 5 log[∆] + 8.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 16.24 + 5 log[∆] + 2.88 log[r]). The additional green curve shows the effect of forward scattering, occurring when the comet is between the earth and the sun, for a gas-to-dust light ratio δ90 of 0.30. (See Marcus 2007)

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
2025-07-03 00:00 UT   15 54 15.4   +08 26 35    14.908   15.544  127.2    3.0   127   25.5 
2025-07-03 05:20 UT   15 54 13.0   +08 26 25    14.912   15.546  127.0    3.0   127   25.5 
2025-07-04 00:00 UT   15 54 04.9   +08 25 52    14.925   15.551  126.4    3.0   127   25.5 
2025-07-05 00:00 UT   15 53 54.7   +08 25 07    14.942   15.557  125.6    3.0   126   25.5 
2025-07-06 00:00 UT   15 53 44.6   +08 24 21    14.960   15.563  124.8    3.1   125   25.6 
2025-07-07 00:00 UT   15 53 34.8   +08 23 33    14.977   15.569  124.0    3.1   125   25.6 
2025-07-08 00:00 UT   15 53 25.1   +08 22 44    14.995   15.575  123.2    3.1   124   25.6 
2025-07-09 00:00 UT   15 53 15.7   +08 21 52    15.013   15.581  122.3    3.2   123   25.6 
2025-07-10 00:00 UT   15 53 06.5   +08 20 59    15.031   15.587  121.5    3.2   123   25.6 
2025-07-11 00:00 UT   15 52 57.5   +08 20 04    15.049   15.593  120.7    3.2   122   25.6 
2025-07-12 00:00 UT   15 52 48.7   +08 19 08    15.067   15.599  119.9    3.2   121   25.6 
2025-07-13 00:00 UT   15 52 40.1   +08 18 10    15.086   15.605  119.1    3.3   121   25.6 

    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.