C/2019 A9 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	27 Jul 2019	12.5	1.426 AU	2.136 AU	07h29m	-12°51'	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	26 Jul 2025	27.4	16.336 AU	15.508 AU	18h34m	+05°26'	143.5°	2.1°	134°

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)                : 0.9637310
            q (Perihelion distance)         : 1.4262310
            i (Inclination)                 : 84.40230
            Ω (Longitude of ascending node) : 278.47220
            ω (Argument of perihelion)      : 237.87640
            L (Longitude of perihelion)     : 287.30277
            B (Latitude of perihelion)      : -57.44384
            T (Time of perihelion passage)  : 2458691.83910
            P (Orbital period in years)     : 246.59

            Epoch                           : 2025 Jul 25
            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
2025-07-26 00:00 UT   18 34 24.5   +05 26 53    15.502   16.333  143.8    2.1   134   27.4 
2025-07-26 13:45 UT   18 34 16.8   +05 26 32    15.508   16.336  143.5    2.1   134   27.4 
2025-07-27 00:00 UT   18 34 11.1   +05 26 17    15.513   16.338  143.2    2.1   133   27.4 
2025-07-28 00:00 UT   18 33 57.8   +05 25 39    15.524   16.343  142.6    2.2   132   27.4 
2025-07-29 00:00 UT   18 33 44.7   +05 25 00    15.536   16.348  142.0    2.2   130   27.4 
2025-07-30 00:00 UT   18 33 31.7   +05 24 20    15.548   16.353  141.3    2.2   129   27.4 
2025-07-31 00:00 UT   18 33 18.9   +05 23 38    15.560   16.358  140.7    2.3   128   27.4 
2025-08-01 00:00 UT   18 33 06.2   +05 22 54    15.572   16.363  140.0    2.3   127   27.4 
2025-08-02 00:00 UT   18 32 53.7   +05 22 10    15.585   16.368  139.3    2.3   126   27.4 
2025-08-03 00:00 UT   18 32 41.3   +05 21 24    15.598   16.374  138.6    2.3   124   27.4 
2025-08-04 00:00 UT   18 32 29.1   +05 20 36    15.611   16.379  137.9    2.4   123   27.4 
2025-08-05 00:00 UT   18 32 17.0   +05 19 47    15.624   16.384  137.2    2.4   122   27.4 

    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.