C/2021 N3 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	4 Jul 2020	19.5	5.711 AU	4.792 AU	18h56m	-50°36'	152.2°	4.8°	359°
Perihelion	15 Aug 2020	19.6	5.704 AU	5.013 AU	18h39m	-48°11'	128.9°	7.9°	64°
Today	13 Aug 2026	25.9	14.607 AU	14.196 AU	01h06m	+29°12'	112.0°	3.7°	237°

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. 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. (8.5 + 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/2021 N3 (PANSTARRS) are:

    e (Eccentricity)                : 0.9584550
    q (Perihelion distance)         : 5.7035240
    i (Inclination)                 : 26.77440
    Ω (Longitude of ascending node) : 337.55000
    ω (Argument of perihelion)      : 304.47110
    L (Longitude of perihelion)     : 285.10969
    B (Latitude of perihelion)      : -21.80075
    T (Time of perihelion passage)  : 2459077.49500
    P (Orbital period in years)     : 1608.56

    Epoch                           : 2026 Aug 12
    Reference                       : MPC194175

    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
2026-08-12 00:00 UT   01 06 47.1   +29 10 20    14.211   14.599  110.6    3.7   238   25.9 
2026-08-13 00:00 UT   01 06 40.9   +29 11 27    14.201   14.604  111.5    3.7   238   25.9 
2026-08-13 13:25 UT   01 06 37.3   +29 12 04    14.196   14.607  112.0    3.7   237   25.9 
2026-08-14 00:00 UT   01 06 34.4   +29 12 33    14.192   14.609  112.4    3.7   237   25.9 
2026-08-15 00:00 UT   01 06 27.7   +29 13 37    14.182   14.614  113.3    3.6   237   25.9 
2026-08-16 00:00 UT   01 06 20.7   +29 14 38    14.173   14.618  114.2    3.6   236   25.9 
2026-08-17 00:00 UT   01 06 13.5   +29 15 38    14.164   14.623  115.1    3.6   236   25.9 
2026-08-18 00:00 UT   01 06 06.0   +29 16 35    14.155   14.628  116.0    3.6   235   25.9 
2026-08-19 00:00 UT   01 05 58.2   +29 17 31    14.146   14.633  116.9    3.5   235   25.9 
2026-08-20 00:00 UT   01 05 50.2   +29 18 24    14.137   14.637  117.8    3.5   235   25.9 
2026-08-21 00:00 UT   01 05 42.0   +29 19 15    14.129   14.642  118.7    3.5   234   25.9 
2026-08-22 00:00 UT   01 05 33.5   +29 20 04    14.120   14.647  119.6    3.4   234   25.9 
2026-08-23 00:00 UT   01 05 24.8   +29 20 51    14.112   14.652  120.5    3.4   233   25.9 

    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.