C/2022 K1 (Leonard)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	16 Dec 2021	20.4	3.982 AU	4.842 AU	18h44m	-03°24'	26.1°	6.3°	39°
Nearest approach	28 Jul 2022	20.1	4.417 AU	3.426 AU	21h24m	-14°24'	165.7°	3.2°	249°
Today	12 Apr 2026	27.4	12.169 AU	12.956 AU	02h23m	-25°03'	36.9°	2.8°	154°

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. (11.0 + 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/2022 K1 (Leonard) are:

    e (Eccentricity)                : 1.0002510
    q (Perihelion distance)         : 3.9820890
    i (Inclination)                 : 41.97910
    Ω (Longitude of ascending node) : 136.33070
    ω (Argument of perihelion)      : 142.51520
    L (Longitude of perihelion)     : 106.64284
    B (Latitude of perihelion)      : 24.01872
    T (Time of perihelion passage)  : 2459564.77950

    Epoch                           : 2026 Mar 16
    Reference                       : MPEC 2026-E44

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-04-11 00:00 UT   02 23 00.5   -25 06 35    12.945   12.160   36.9    2.8   152   27.4 
2026-04-12 00:00 UT   02 23 23.4   -25 04 31    12.952   12.165   36.9    2.8   153   27.4 
2026-04-12 16:56 UT   02 23 39.6   -25 03 05    12.956   12.169   36.9    2.8   154   27.4 
2026-04-13 00:00 UT   02 23 46.4   -25 02 30    12.958   12.171   36.9    2.8   155   27.4 
2026-04-14 00:00 UT   02 24 09.4   -25 00 31    12.964   12.177   36.9    2.8   156   27.4 
2026-04-15 00:00 UT   02 24 32.5   -24 58 34    12.970   12.183   36.9    2.8   158   27.4 
2026-04-16 00:00 UT   02 24 55.6   -24 56 40    12.975   12.188   36.9    2.8   159   27.4 
2026-04-17 00:00 UT   02 25 18.8   -24 54 49    12.981   12.194   37.0    2.8   161   27.4 
2026-04-18 00:00 UT   02 25 42.0   -24 52 60    12.986   12.200   37.0    2.8   162   27.4 
2026-04-19 00:00 UT   02 26 05.2   -24 51 13    12.991   12.205   37.1    2.8   164   27.4 
2026-04-20 00:00 UT   02 26 28.5   -24 49 29    12.995   12.211   37.2    2.9   165   27.4 
2026-04-21 00:00 UT   02 26 51.8   -24 47 48    13.000   12.217   37.3    2.9   167   27.4 
2026-04-22 00:00 UT   02 27 15.1   -24 46 10    13.004   12.223   37.5    2.9   168   27.4 

    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.