C/2018 F4 (PANSTARRS) - DISINTEGRATED
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	6 May 2019	14.5	3.939 AU	3.253 AU	11h55m	-58°57'	126.7°	11.9°	56°
Perihelion	30 Nov 2019	13.8	3.449 AU	3.793 AU	14h02m	-82°34'	62.4°	14.7°	217°
Disintegration	12 Sep 2020	15.6	4.315 AU	3.724 AU	03h01m	-37°18'	119.9°	11.7°	289°
Today	4 Aug 2025	-	15.168 AU	15.047 AU	01h34m	+37°56'	94.9°	3.8°	244°

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/2018 F4 (PANSTARRS) are:

            e (Eccentricity)                : 0.9979740
            q (Perihelion distance)         : 3.4487620
            i (Inclination)                 : 78.14470
            Ω (Longitude of ascending node) : 26.54200
            ω (Argument of perihelion)      : 263.19330
            L (Longitude of perihelion)     : 86.38535
            B (Latitude of perihelion)      : -76.35392
            T (Time of perihelion passage)  : 2458818.25720
            P (Orbital period in years)     : 70232.10

            Epoch                           : 2025 Aug 03
            Reference                       : MPEC 2023-A50

            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 (11.00 + 5 log[∆] + 15.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently .77 + 5 log[∆] + 18.81 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
2025-08-04 00:00 UT   01 35 02.3   +37 55 07    15.052   15.165   94.4    3.8   244   28.9 
2025-08-04 12:43 UT   01 34 59.0   +37 56 12    15.047   15.168   94.9    3.8   244   28.9 
2025-08-05 00:00 UT   01 34 56.0   +37 57 08    15.042   15.170   95.3    3.8   244   28.9 
2025-08-06 00:00 UT   01 34 49.5   +37 59 07    15.033   15.176   96.2    3.8   243   28.9 
2025-08-07 00:00 UT   01 34 42.7   +38 01 05    15.023   15.181   97.0    3.8   243   28.9 
2025-08-08 00:00 UT   01 34 35.5   +38 03 01    15.014   15.187   97.9    3.8   242   28.9 
2025-08-09 00:00 UT   01 34 28.1   +38 04 55    15.004   15.192   98.8    3.8   242   28.9 
2025-08-10 00:00 UT   01 34 20.3   +38 06 48    14.995   15.198   99.6    3.8   241   28.9 
2025-08-11 00:00 UT   01 34 12.2   +38 08 39    14.985   15.203  100.5    3.8   241   28.9 
2025-08-12 00:00 UT   01 34 03.8   +38 10 28    14.976   15.209  101.4    3.7   240   28.9 
2025-08-13 00:00 UT   01 33 55.2   +38 12 15    14.967   15.214  102.2    3.7   240   28.9 
2025-08-14 00:00 UT   01 33 46.2   +38 14 00    14.957   15.220  103.1    3.7   239   28.9 

    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.