C/2020 F3 (NEOWISE)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	5 Jul 2020	1.7	0.293 AU	1.148 AU	06h05m	+30°19'	13.9°	56.7°	300°
Nearest approach	24 Jul 2020	3.6	0.620 AU	0.698 AU	10h28m	+43°51'	36.8°	100.8°	60°
Today	5 Jan 2026	25.4	17.160 AU	17.674 AU	14h45m	-33°34'	57.1°	2.8°	277°

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 6.7 + 5 log[∆] + 10.1 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 F3 (NEOWISE) are:

    e (Eccentricity)                : 0.9992810
    q (Perihelion distance)         : 0.2928560
    i (Inclination)                 : 129.07890
    Ω (Longitude of ascending node) : 61.05840
    ω (Argument of perihelion)      : 37.32210
    L (Longitude of perihelion)     : 35.38886
    B (Latitude of perihelion)      : 28.07676
    T (Time of perihelion passage)  : 2459035.68130
    P (Orbital period in years)     : 8220.30

    Epoch                           : 2025 Nov 12
    Reference                       : MPEC 2021-O56

    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
2026-01-04 00:00 UT   14 45 33.3   -33 32 07    17.685   17.152   55.8    2.7   276   25.4 
2026-01-05 00:00 UT   14 45 40.2   -33 33 33    17.677   17.158   56.7    2.7   277   25.4 
2026-01-05 09:31 UT   14 45 42.9   -33 34 08    17.674   17.160   57.1    2.8   277   25.4 
2026-01-06 00:00 UT   14 45 46.9   -33 34 60    17.669   17.163   57.6    2.8   277   25.4 
2026-01-07 00:00 UT   14 45 53.4   -33 36 26    17.661   17.169   58.6    2.8   278   25.4 
2026-01-08 00:00 UT   14 45 59.7   -33 37 51    17.653   17.175   59.5    2.8   278   25.4 
2026-01-09 00:00 UT   14 46 05.7   -33 39 17    17.644   17.181   60.4    2.9   278   25.4 
2026-01-10 00:00 UT   14 46 11.5   -33 40 42    17.635   17.186   61.4    2.9   279   25.4 
2026-01-11 00:00 UT   14 46 17.0   -33 42 06    17.627   17.192   62.3    2.9   279   25.4 
2026-01-12 00:00 UT   14 46 22.4   -33 43 30    17.618   17.198   63.3    2.9   279   25.4 
2026-01-13 00:00 UT   14 46 27.4   -33 44 54    17.608   17.204   64.2    3.0   280   25.4 
2026-01-14 00:00 UT   14 46 32.2   -33 46 17    17.599   17.209   65.1    3.0   280   25.4 
2026-01-15 00:00 UT   14 46 36.8   -33 47 40    17.590   17.215   66.1    3.0   280   25.4 

    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.