C/2019 A9 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	26 Jul 2019	12.5	1.429 AU	2.140 AU	07h27m	-12°47'	34.8°	23.9°	202°
Nearest approach	4 Sep 2019	12.6	1.536 AU	1.918 AU	09h21m	-41°20'	52.8°	31.6°	208°
Today	20 Apr 2024	26.4	13.891 AU	13.616 AU	18h55m	+01°29'	103.9°	4.0°	258°

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)                : 0.9635150
            q (Perihelion distance)         : 1.4294100
            i (Inclination)                 : 84.34420
            Ω (Longitude of ascending node) : 278.44480
            ω (Argument of perihelion)      : 237.90240
            L (Longitude of perihelion)     : 287.37412
            B (Latitude of perihelion)      : -57.46043
            T (Time of perihelion passage)  : 2458690.75830
            P (Orbital period in years)     : 245.22

            Epoch                           : 2024 Apr 19
            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 9.31 + 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
2024-04-20 00:00 UT   18 55 47.5   +01 28 49    13.620   13.889  103.4    4.0   258   26.4 
2024-04-20 11:52 UT   18 55 44.9   +01 29 51    13.616   13.891  103.9    4.0   258   26.4 
2024-04-21 00:00 UT   18 55 42.2   +01 30 55    13.611   13.894  104.3    4.0   257   26.4 
2024-04-22 00:00 UT   18 55 36.6   +01 32 60    13.601   13.900  105.2    4.0   257   26.4 
2024-04-23 00:00 UT   18 55 30.7   +01 35 04    13.592   13.905  106.1    4.0   256   26.4 
2024-04-24 00:00 UT   18 55 24.6   +01 37 07    13.583   13.911  107.0    4.0   256   26.4 
2024-04-25 00:00 UT   18 55 18.1   +01 39 10    13.573   13.916  107.9    3.9   256   26.4 
2024-04-26 00:00 UT   18 55 11.4   +01 41 11    13.564   13.922  108.8    3.9   255   26.4 
2024-04-27 00:00 UT   18 55 04.4   +01 43 12    13.555   13.927  109.7    3.9   255   26.4 
2024-04-28 00:00 UT   18 54 57.1   +01 45 12    13.546   13.933  110.6    3.9   254   26.4 
2024-04-29 00:00 UT   18 54 49.6   +01 47 11    13.537   13.938  111.5    3.9   254   26.4 
2024-04-30 00:00 UT   18 54 41.8   +01 49 08    13.529   13.944  112.4    3.8   253   26.4 

    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.