C/2021 O3 (PANSTARRS) - DISINTEGRATED
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Disintegration	21 Apr 2022	9.4	0.285 AU	0.983 AU	02h50m	+03°07'	16.5°	86.1°	122°
Perihelion	21 Apr 2022	-	0.285 AU	0.964 AU	02h53m	+03°38'	16.5°	89.9°	121°
Nearest approach	9 May 2022	12.3	0.590 AU	0.607 AU	04h01m	+46°47'	32.0°	115.0°	27°
Today	10 Aug 2026	-	14.601 AU	14.053 AU	19h20m	+36°17'	121.0°	3.4°	146°

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)                : 1.0000720
    q (Perihelion distance)         : 0.2849930
    i (Inclination)                 : 56.86520
    Ω (Longitude of ascending node) : 188.59580
    ω (Argument of perihelion)      : 300.12420
    L (Longitude of perihelion)     : 145.30541
    B (Latitude of perihelion)      : -46.40973
    T (Time of perihelion passage)  : 2459690.97350

    Epoch                           : 2026 May 29
    Reference                       : MPC194175

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-08-09 00:00 UT   19 21 16.8   +36 21 14    14.039   14.591  121.2    3.4   148   25.0 
2026-08-10 00:00 UT   19 21 00.1   +36 19 12    14.047   14.597  121.1    3.4   147   25.0 
2026-08-10 15:00 UT   19 20 49.8   +36 17 54    14.053   14.601  121.0    3.4   146   25.0 
2026-08-11 00:00 UT   19 20 43.7   +36 17 07    14.056   14.603  120.9    3.4   146   25.0 
2026-08-12 00:00 UT   19 20 27.4   +36 14 59    14.065   14.610  120.7    3.4   144   25.0 
2026-08-13 00:00 UT   19 20 11.4   +36 12 48    14.075   14.616  120.5    3.4   143   25.0 
2026-08-14 00:00 UT   19 19 55.6   +36 10 33    14.084   14.622  120.3    3.4   142   25.0 
2026-08-15 00:00 UT   19 19 40.0   +36 08 17    14.094   14.629  120.1    3.4   141   25.0 
2026-08-16 00:00 UT   19 19 24.6   +36 05 57    14.103   14.635  119.9    3.4   140   25.0 
2026-08-17 00:00 UT   19 19 09.5   +36 03 34    14.113   14.641  119.7    3.4   139   25.0 
2026-08-18 00:00 UT   19 18 54.6   +36 01 09    14.123   14.648  119.4    3.5   137   25.0 
2026-08-19 00:00 UT   19 18 39.9   +35 58 42    14.133   14.654  119.2    3.5   136   25.0 
2026-08-20 00:00 UT   19 18 25.5   +35 56 12    14.144   14.660  118.9    3.5   135   25.0 

    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.