C/2021 O3 (PANSTARRS) - DISINTEGRATED
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Disintegration	21 Apr 2022	9.4	0.285 AU	0.981 AU	02h50m	+03°09'	16.5°	86.5°	122°
Perihelion	21 Apr 2022	-	0.285 AU	0.964 AU	02h53m	+03°37'	16.5°	90.0°	121°
Nearest approach	8 May 2022	12.3	0.590 AU	0.606 AU	04h01m	+46°48'	32.0°	115.1°	27°
Today	11 May 2026	-	14.021 AU	13.876 AU	19h45m	+35°25'	96.2°	4.1°	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.)

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 12.6 + 5 log[∆] + 5.7 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 O3 (PANSTARRS) are:

    e (Eccentricity)                : 1.0000670
    q (Perihelion distance)         : 0.2849120
    i (Inclination)                 : 56.85610
    Ω (Longitude of ascending node) : 188.64080
    ω (Argument of perihelion)      : 300.09630
    L (Longitude of perihelion)     : 145.31137
    B (Latitude of perihelion)      : -46.42049
    T (Time of perihelion passage)  : 2459690.93270

    Epoch                           : 2026 Mar 16
    Reference                       : MPEC 2026-E44

    Classification(s):              : Nearly isotropic; New (a > 10000 AU)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-05-10 00:00 UT   19 46 08.5   +35 21 09    13.881   14.011   95.3    4.1   244   24.8 
2026-05-11 00:00 UT   19 46 00.8   +35 24 07    13.878   14.017   95.9    4.1   243   24.8 
2026-05-11 13:39 UT   19 45 56.2   +35 25 48    13.876   14.021   96.2    4.1   243   24.8 
2026-05-12 00:00 UT   19 45 52.7   +35 27 03    13.874   14.024   96.4    4.1   243   24.8 
2026-05-13 00:00 UT   19 45 44.4   +35 29 58    13.871   14.030   96.9    4.1   242   24.8 
2026-05-14 00:00 UT   19 45 35.7   +35 32 50    13.868   14.036   97.5    4.1   241   24.8 
2026-05-15 00:00 UT   19 45 26.7   +35 35 40    13.865   14.043   98.0    4.1   240   24.8 
2026-05-16 00:00 UT   19 45 17.4   +35 38 28    13.863   14.049   98.6    4.1   239   24.8 
2026-05-17 00:00 UT   19 45 07.7   +35 41 14    13.860   14.056   99.1    4.1   238   24.8 
2026-05-18 00:00 UT   19 44 57.8   +35 43 58    13.857   14.062   99.6    4.1   237   24.8 
2026-05-19 00:00 UT   19 44 47.5   +35 46 39    13.854   14.069  100.2    4.1   237   24.8 
2026-05-20 00:00 UT   19 44 36.9   +35 49 18    13.852   14.075  100.7    4.1   236   24.8 
2026-05-21 00:00 UT   19 44 26.1   +35 51 55    13.849   14.081  101.2    4.0   235   24.8 

    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.