C/2018 F4 (PANSTARRS) - DISINTEGRATED
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	6 May 2019	14.5	3.940 AU	3.253 AU	11h55m	-58°57'	126.7°	11.8°	56°
Perihelion	30 Nov 2019	13.8	3.449 AU	3.793 AU	14h03m	-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	19 Jul 2025	-	15.077 AU	15.206 AU	01h35m	+37°19'	80.8°	3.8°	251°

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)                : 0.9979910
            q (Perihelion distance)         : 3.4487000
            i (Inclination)                 : 78.14240
            Ω (Longitude of ascending node) : 26.54080
            ω (Argument of perihelion)      : 263.19380
            L (Longitude of perihelion)     : 86.39075
            B (Latitude of perihelion)      : -76.35217
            T (Time of perihelion passage)  : 2458818.29410
            P (Orbital period in years)     : 71123.52

            Epoch                           : 2025 Jul 17
            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
2025-07-19 00:00 UT   01 35 59.5   +37 19 37    15.207   15.077   80.7    3.8   251   28.8 
2025-07-19 01:20 UT   01 35 59.4   +37 19 45    15.206   15.077   80.8    3.8   251   28.8 
2025-07-20 00:00 UT   01 35 58.2   +37 21 59    15.197   15.083   81.6    3.8   250   28.8 
2025-07-21 00:00 UT   01 35 56.7   +37 24 21    15.188   15.088   82.4    3.8   250   28.9 
2025-07-22 00:00 UT   01 35 54.8   +37 26 41    15.178   15.094   83.3    3.8   249   28.9 
2025-07-23 00:00 UT   01 35 52.6   +37 29 01    15.169   15.099   84.1    3.8   249   28.9 
2025-07-24 00:00 UT   01 35 50.2   +37 31 19    15.159   15.105   85.0    3.8   249   28.9 
2025-07-25 00:00 UT   01 35 47.4   +37 33 35    15.149   15.110   85.8    3.8   248   28.9 
2025-07-26 00:00 UT   01 35 44.3   +37 35 51    15.139   15.115   86.7    3.8   248   28.9 
2025-07-27 00:00 UT   01 35 40.9   +37 38 05    15.130   15.121   87.6    3.8   247   28.9 
2025-07-28 00:00 UT   01 35 37.1   +37 40 18    15.120   15.126   88.4    3.8   247   28.9 
2025-07-29 00:00 UT   01 35 33.1   +37 42 29    15.110   15.132   89.3    3.8   247   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.