C/2019 Q1 (Lemmon)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	21 Jul 2020	18.7	5.005 AU	4.464 AU	23h21m	+20°24'	116.8°	10.4°	233°
Nearest approach	2 Sep 2020	18.6	5.016 AU	4.093 AU	22h18m	+17°52'	153.5°	5.1°	163°
Today	20 Apr 2024	23.8	10.787 AU	10.049 AU	16h55m	-09°54'	135.3°	3.8°	263°

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 Q1 (Lemmon) are:

            e (Eccentricity)                : 1.0016690
            q (Perihelion distance)         : 5.0049760
            i (Inclination)                 : 155.73120
            Ω (Longitude of ascending node) : 42.45660
            ω (Argument of perihelion)      : 56.24210
            L (Longitude of perihelion)     : -11.29563
            B (Latitude of perihelion)      : 19.98155
            T (Time of perihelion passage)  : 2459051.88720

            Epoch                           : 2024 Apr 19
            Reference                       : MPEC 2024-EF7

            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. (8.50 + 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
2024-04-20 00:00 UT   16 55 21.8   -09 54 42    10.051   10.785  135.0    3.8   264   23.8 
2024-04-20 09:03 UT   16 55 12.8   -09 54 21    10.049   10.787  135.3    3.8   263   23.8 
2024-04-21 00:00 UT   16 54 57.9   -09 53 47    10.045   10.790  136.0    3.7   263   23.8 
2024-04-22 00:00 UT   16 54 33.8   -09 52 51    10.039   10.796  137.0    3.6   263   23.8 
2024-04-23 00:00 UT   16 54 09.3   -09 51 56    10.032   10.801  138.0    3.6   262   23.8 
2024-04-24 00:00 UT   16 53 44.5   -09 51 02    10.027   10.807  139.0    3.5   262   23.8 
2024-04-25 00:00 UT   16 53 19.5   -09 50 07    10.021   10.812  140.1    3.4   261   23.8 
2024-04-26 00:00 UT   16 52 54.1   -09 49 14    10.016   10.817  141.1    3.4   261   23.8 
2024-04-27 00:00 UT   16 52 28.5   -09 48 20    10.011   10.823  142.1    3.3   260   23.8 
2024-04-28 00:00 UT   16 52 02.6   -09 47 27    10.006   10.828  143.1    3.2   259   23.8 
2024-04-29 00:00 UT   16 51 36.5   -09 46 35    10.002   10.834  144.1    3.1   259   23.8 
2024-04-30 00:00 UT   16 51 10.1   -09 45 43     9.997   10.839  145.1    3.0   258   23.8 

    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.