C/2019 A9 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	27 Jul 2019	12.5	1.426 AU	2.135 AU	07h29m	-12°52'	34.9°	24.0°	203°
Nearest approach	4 Sep 2019	12.6	1.531 AU	1.915 AU	09h22m	-41°21'	52.7°	31.6°	209°
Today	22 Aug 2025	27.5	16.471 AU	15.887 AU	18h29m	+05°02'	123.8°	2.9°	108°

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/2019 A9 (PANSTARRS) are:

            e (Eccentricity)                : 0.9637450
            q (Perihelion distance)         : 1.4260090
            i (Inclination)                 : 84.40460
            Ω (Longitude of ascending node) : 278.47340
            ω (Argument of perihelion)      : 237.87480
            L (Longitude of perihelion)     : 287.29987
            B (Latitude of perihelion)      : -57.44262
            T (Time of perihelion passage)  : 2458691.92110
            P (Orbital period in years)     : 246.68

            Epoch                           : 2025 Aug 21
            Reference                       : MPC118842

            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 (15.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 9.33 + 5 log[∆] + 10.00 log[r]).

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
2025-08-22 00:00 UT   18 29 20.3   +05 02 60    15.881   16.469  124.1    2.9   108   27.5 
2025-08-22 07:51 UT   18 29 17.5   +05 02 38    15.887   16.471  123.8    2.9   108   27.5 
2025-08-23 00:00 UT   18 29 11.8   +05 01 52    15.898   16.474  123.2    2.9   107   27.5 
2025-08-24 00:00 UT   18 29 03.4   +05 00 43    15.915   16.479  122.4    3.0   107   27.5 
2025-08-25 00:00 UT   18 28 55.3   +04 59 33    15.932   16.484  121.6    3.0   106   27.5 
2025-08-26 00:00 UT   18 28 47.4   +04 58 23    15.949   16.489  120.8    3.0   105   27.5 
2025-08-27 00:00 UT   18 28 39.7   +04 57 11    15.967   16.494  119.9    3.0   105   27.5 
2025-08-28 00:00 UT   18 28 32.2   +04 55 59    15.984   16.500  119.1    3.1   104   27.5 
2025-08-29 00:00 UT   18 28 25.0   +04 54 47    16.002   16.505  118.2    3.1   104   27.5 
2025-08-30 00:00 UT   18 28 18.0   +04 53 34    16.020   16.510  117.4    3.1   103   27.5 
2025-08-31 00:00 UT   18 28 11.3   +04 52 20    16.038   16.515  116.6    3.1   102   27.5 
2025-09-01 00:00 UT   18 28 04.7   +04 51 06    16.056   16.520  115.7    3.2   102   27.5 

    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.