C/2019 U6 (Lemmon)
ephemeris date magn radius delta ra dec elong phase PA
Perihelion18 Jun 20206.50.911 AU0.860 AU08h53m-11°46'57.4°70.0°128°
Nearest approach28 Jun 20206.50.930 AU0.818 AU10h10m-03°35'59.8°70.8°120°
Today28 Mar 202430.812.725 AU13.383 AU23h11m+47°06'47.0°3.3°333°
C/2019 U6 (Lemmon)- 2024-03-28
astro.vanbuitenen.nl


 
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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/2019 U6 (Lemmon) are:

            e (Eccentricity)                : 0.9971520
            q (Perihelion distance)         : 0.9111020
            i (Inclination)                 : 60.96600
            Ω (Longitude of ascending node) : 235.78860
            ω (Argument of perihelion)      : 329.50330
            L (Longitude of perihelion)     : 219.83640
            B (Latitude of perihelion)      : -26.34106
            T (Time of perihelion passage)  : 2459018.77820
            P (Orbital period in years)     : 5721.90

            Epoch                           : 2024 Mar 27
            Reference                       : MPEC 2022-H04

            Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)
        

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 (10.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 7.47 + 5 log[∆] + 16.04 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
2024-03-28 00:00 UT   23 11 36.8   +47 05 43    13.380   12.722   47.1    3.3   334   30.8 
2024-03-28 11:14 UT   23 11 48.5   +47 06 46    13.383   12.725   47.0    3.3   333   30.8 
2024-03-29 00:00 UT   23 12 01.8   +47 07 57    13.388   12.728   47.0    3.3   333   30.8 
2024-03-30 00:00 UT   23 12 26.6   +47 10 13    13.395   12.735   46.9    3.3   331   30.8 
2024-03-31 00:00 UT   23 12 51.3   +47 12 32    13.403   12.741   46.9    3.3   330   30.8 
2024-04-01 00:00 UT   23 13 15.8   +47 14 53    13.410   12.748   46.8    3.3   329   30.8 
2024-04-02 00:00 UT   23 13 40.2   +47 17 17    13.417   12.754   46.8    3.3   328   30.8 
2024-04-03 00:00 UT   23 14 04.4   +47 19 43    13.425   12.761   46.7    3.3   327   30.9 
2024-04-04 00:00 UT   23 14 28.5   +47 22 11    13.431   12.767   46.7    3.3   325   30.9 
2024-04-05 00:00 UT   23 14 52.4   +47 24 41    13.438   12.774   46.7    3.3   324   30.9 
2024-04-06 00:00 UT   23 15 16.1   +47 27 14    13.444   12.780   46.8    3.3   323   30.9 
2024-04-07 00:00 UT   23 15 39.6   +47 29 49    13.451   12.787   46.8    3.3   322   30.9 


    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.