C/2020 F3 (NEOWISE)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	5 Jul 2020	1.6	0.293 AU	1.148 AU	06h04m	+30°19'	13.9°	56.6°	300°
Nearest approach	23 Jul 2020	3.6	0.621 AU	0.697 AU	10h28m	+43°56'	36.9°	100.7°	60°
Today	28 Aug 2025	25.1	16.405 AU	16.741 AU	14h20m	-31°36'	68.9°	3.3°	116°

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 F3 (NEOWISE) are:

            e (Eccentricity)                : 0.9992750
            q (Perihelion distance)         : 0.2932640
            i (Inclination)                 : 129.10470
            Ω (Longitude of ascending node) : 61.07200
            ω (Argument of perihelion)      : 37.34030
            L (Longitude of perihelion)     : 35.37532
            B (Latitude of perihelion)      : 28.07830
            T (Time of perihelion passage)  : 2459035.53600
            P (Orbital period in years)     : 8135.44

            Epoch                           : 2025 Aug 27
            Reference                       : MPEC 2021-O56

            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 (7.50 + 5 log[∆] + 13.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 6.72 + 5 log[∆] + 10.08 log[r]). The additional green curve shows the effect of forward scattering, occurring when the comet is between the earth and the sun, for a gas-to-dust light ratio δ90 of 2.00. (See Marcus 2007)

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
2025-08-28 00:00 UT   14 19 55.4   -31 36 17    16.725   16.400   69.6    3.3   116   25.1 
2025-08-28 17:47 UT   14 20 00.6   -31 36 03    16.741   16.405   68.9    3.3   116   25.1 
2025-08-29 00:00 UT   14 20 02.5   -31 35 58    16.746   16.406   68.7    3.3   117   25.1 
2025-08-30 00:00 UT   14 20 09.7   -31 35 42    16.767   16.412   67.8    3.3   117   25.1 
2025-08-31 00:00 UT   14 20 17.2   -31 35 26    16.788   16.418   66.9    3.2   117   25.1 
2025-09-01 00:00 UT   14 20 24.8   -31 35 13    16.808   16.424   66.0    3.2   117   25.1 
2025-09-02 00:00 UT   14 20 32.7   -31 35 00    16.829   16.430   65.1    3.2   118   25.1 
2025-09-03 00:00 UT   14 20 40.8   -31 34 50    16.849   16.436   64.2    3.2   118   25.1 
2025-09-04 00:00 UT   14 20 49.0   -31 34 40    16.869   16.442   63.3    3.1   118   25.1 
2025-09-05 00:00 UT   14 20 57.5   -31 34 33    16.890   16.447   62.4    3.1   119   25.1 
2025-09-06 00:00 UT   14 21 06.2   -31 34 26    16.910   16.453   61.5    3.1   119   25.1 
2025-09-07 00:00 UT   14 21 15.0   -31 34 22    16.930   16.459   60.6    3.1   119   25.1 

    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.