C/2020 S8 (Lemmon)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	10 Apr 2021	15.7	2.356 AU	1.469 AU	15h05m	+15°08'	144.1°	14.4°	232°
Nearest approach	22 Apr 2021	15.7	2.360 AU	1.410 AU	14h10m	+12°33'	154.9°	10.4°	185°
Today	23 Sep 2026	28.9	15.272 AU	15.041 AU	05h00m	-38°55'	101.4°	3.7°	279°

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 11.2 + 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 S8 (Lemmon) are:

    e (Eccentricity)                : 0.9899600
    q (Perihelion distance)         : 2.3555200
    i (Inclination)                 : 108.56680
    Ω (Longitude of ascending node) : 23.94660
    ω (Argument of perihelion)      : 160.09570
    L (Longitude of perihelion)     : 30.52319
    B (Latitude of perihelion)      : 18.82815
    T (Time of perihelion passage)  : 2459314.51500
    P (Orbital period in years)     : 3593.60

    Epoch                           : 2026 May 29
    Reference                       : MPC194170

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-09-22 00:00 UT   05 00 49.4   -38 51 43    15.044   15.265  100.9    3.7   278   28.9 
2026-09-23 00:00 UT   05 00 41.9   -38 54 48    15.042   15.271  101.3    3.7   279   28.9 
2026-09-23 06:10 UT   05 00 39.9   -38 55 35    15.041   15.272  101.4    3.7   279   28.9 
2026-09-24 00:00 UT   05 00 34.0   -38 57 52    15.040   15.277  101.8    3.7   280   28.9 
2026-09-25 00:00 UT   05 00 25.7   -39 00 55    15.038   15.282  102.2    3.7   281   28.9 
2026-09-26 00:00 UT   05 00 17.1   -39 03 57    15.036   15.288  102.7    3.7   282   28.9 
2026-09-27 00:00 UT   05 00 08.2   -39 06 59    15.034   15.293  103.1    3.7   283   28.9 
2026-09-28 00:00 UT   04 59 58.9   -39 10 00    15.032   15.299  103.6    3.7   284   28.9 
2026-09-29 00:00 UT   04 59 49.2   -39 12 60    15.031   15.305  104.0    3.6   285   28.9 
2026-09-30 00:00 UT   04 59 39.3   -39 15 59    15.029   15.310  104.4    3.6   286   28.9 
2026-10-01 00:00 UT   04 59 28.9   -39 18 57    15.028   15.316  104.9    3.6   287   28.9 
2026-10-02 00:00 UT   04 59 18.3   -39 21 53    15.027   15.321  105.3    3.6   288   28.9 
2026-10-03 00:00 UT   04 59 07.3   -39 24 49    15.025   15.327  105.7    3.6   289   28.9 

    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.