C/2020 K3 (Leonard)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	1 Jun 2020	19.3	1.583 AU	1.824 AU	00h01m	+41°40'	60.0°	33.7°	266°
Nearest approach	11 Jul 2020	18.9	1.676 AU	1.307 AU	18h53m	+66°20'	91.4°	37.3°	173°
Today	14 Apr 2026	34.3	16.853 AU	15.961 AU	11h50m	-24°30'	151.9°	1.6°	62°

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. This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 16.0 + 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 K3 (Leonard) are:

    e (Eccentricity)                : 1.0000000
    q (Perihelion distance)         : 1.5830690
    i (Inclination)                 : 129.01520
    Ω (Longitude of ascending node) : 28.35460
    ω (Argument of perihelion)      : 64.49240
    L (Longitude of perihelion)     : 335.51426
    B (Latitude of perihelion)      : 44.52701
    T (Time of perihelion passage)  : 2459001.50310

    Epoch                           : 
    Reference                       : MPEC 2020-KF9

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-04-13 00:00 UT   11 51 16.3   -24 34 02    15.944   16.843  152.9    1.6    59   34.3 
2026-04-14 00:00 UT   11 51 01.3   -24 32 17    15.954   16.849  152.3    1.6    61   34.3 
2026-04-14 19:02 UT   11 50 49.4   -24 30 53    15.961   16.853  151.9    1.6    62   34.3 
2026-04-15 00:00 UT   11 50 46.4   -24 30 31    15.963   16.854  151.8    1.6    62   34.3 
2026-04-16 00:00 UT   11 50 31.6   -24 28 45    15.973   16.860  151.2    1.6    64   34.3 
2026-04-17 00:00 UT   11 50 17.0   -24 26 58    15.984   16.866  150.6    1.7    66   34.3 
2026-04-18 00:00 UT   11 50 02.5   -24 25 10    15.994   16.871  149.9    1.7    68   34.3 
2026-04-19 00:00 UT   11 49 48.2   -24 23 21    16.005   16.877  149.3    1.7    69   34.3 
2026-04-20 00:00 UT   11 49 34.0   -24 21 32    16.016   16.883  148.6    1.8    71   34.3 
2026-04-21 00:00 UT   11 49 20.1   -24 19 43    16.028   16.888  147.9    1.8    72   34.3 
2026-04-22 00:00 UT   11 49 06.2   -24 17 52    16.039   16.894  147.2    1.8    74   34.3 
2026-04-23 00:00 UT   11 48 52.6   -24 16 02    16.051   16.899  146.5    1.9    75   34.3 
2026-04-24 00:00 UT   11 48 39.1   -24 14 11    16.064   16.905  145.8    1.9    76   34.3 

    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.