C/2020 W5 (Lemmon)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	30 Nov 2020	22.3	3.367 AU	2.514 AU	04h57m	+56°38'	144.6°	9.8°	192°
Nearest approach	1 Dec 2020	22.3	3.367 AU	2.514 AU	04h53m	+57°01'	144.7°	9.7°	188°
Today	19 Apr 2024	30.1	10.351 AU	9.884 AU	17h31m	+24°38'	115.1°	5.0°	243°

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 W5 (Lemmon) are:

            e (Eccentricity)                : 1.0014880
            q (Perihelion distance)         : 3.3668780
            i (Inclination)                 : 88.61240
            Ω (Longitude of ascending node) : 75.47060
            ω (Argument of perihelion)      : 24.53310
            L (Longitude of perihelion)     : 76.10385
            B (Latitude of perihelion)      : 24.52543
            T (Time of perihelion passage)  : 2459183.95540

            Epoch                           : 2024 Apr 18
            Reference                       : MPEC 2021-BE3

            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. (15.00 + 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
2024-04-19 00:00 UT   17 31 10.4   +24 38 00     9.885   10.348  114.9    5.0   243   30.1 
2024-04-19 08:54 UT   17 31 04.3   +24 38 49     9.884   10.351  115.1    5.0   243   30.1 
2024-04-20 00:00 UT   17 30 53.8   +24 40 09     9.882   10.355  115.5    5.0   242   30.1 
2024-04-21 00:00 UT   17 30 36.7   +24 42 15     9.879   10.361  116.1    5.0   242   30.1 
2024-04-22 00:00 UT   17 30 19.4   +24 44 19     9.876   10.367  116.7    5.0   241   30.1 
2024-04-23 00:00 UT   17 30 01.6   +24 46 20     9.873   10.373  117.3    4.9   240   30.1 
2024-04-24 00:00 UT   17 29 43.5   +24 48 18     9.871   10.379  117.9    4.9   239   30.1 
2024-04-25 00:00 UT   17 29 25.0   +24 50 13     9.869   10.386  118.4    4.9   238   30.1 
2024-04-26 00:00 UT   17 29 06.2   +24 52 05     9.867   10.392  119.0    4.9   237   30.1 
2024-04-27 00:00 UT   17 28 47.0   +24 53 54     9.865   10.398  119.5    4.8   236   30.1 
2024-04-28 00:00 UT   17 28 27.5   +24 55 40     9.863   10.404  120.1    4.8   235   30.1 
2024-04-29 00:00 UT   17 28 07.7   +24 57 23     9.861   10.411  120.6    4.8   233   30.1 

    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.