P/2017 P1 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	18 Jun 2018	21.0	5.473 AU	5.340 AU	23h31m	+04°11'	92.2°	10.7°	246°
Nearest approach	13 Sep 2018	20.7	5.485 AU	4.486 AU	23h21m	+03°35'	172.6°	1.4°	172°
Today	22 Jun 2025	24.8	9.403 AU	10.256 AU	08h08m	+13°01'	31.4°	3.2°	114°

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 P/2017 P1 (PANSTARRS) are:

            e (Eccentricity)                : 0.3089870
            q (Perihelion distance)         : 5.4734390
            i (Inclination)                 : 7.68800
            Ω (Longitude of ascending node) : 221.46930
            ω (Argument of perihelion)      : 122.77130
            L (Longitude of perihelion)     : 164.47650
            B (Latitude of perihelion)      : 6.45865
            T (Time of perihelion passage)  : 2458288.49300
            P (Orbital period in years)     : 22.29

            Epoch                           : 2025 Jun 21
            Reference                       : MPC114599

            Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); Halley type (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 light curve is based on the absolute magnitude and slope parameter as calculated from an MPEC, or the latest values provided by the minor planet center. (10.00 + 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
2025-06-22 00:00 UT   08 08 04.7   +13 01 29    10.254    9.403   31.6    3.2   114   24.8 
2025-06-22 05:54 UT   08 08 11.2   +13 01 13    10.256    9.403   31.4    3.2   114   24.8 
2025-06-23 00:00 UT   08 08 31.2   +13 00 24    10.263    9.404   30.8    3.2   114   24.8 
2025-06-24 00:00 UT   08 08 57.9   +12 59 17    10.273    9.406   29.9    3.1   115   24.8 
2025-06-25 00:00 UT   08 09 24.6   +12 58 09    10.282    9.407   29.1    3.0   115   24.8 
2025-06-26 00:00 UT   08 09 51.5   +12 56 60    10.291    9.408   28.3    2.9   116   24.8 
2025-06-27 00:00 UT   08 10 18.6   +12 55 50    10.299    9.409   27.5    2.9   116   24.8 
2025-06-28 00:00 UT   08 10 45.7   +12 54 38    10.308    9.411   26.7    2.8   117   24.8 
2025-06-29 00:00 UT   08 11 12.9   +12 53 25    10.316    9.412   25.9    2.7   117   24.8 
2025-06-30 00:00 UT   08 11 40.2   +12 52 11    10.324    9.413   25.1    2.6   118   24.8 
2025-07-01 00:00 UT   08 12 07.7   +12 50 56    10.332    9.414   24.2    2.5   118   24.8 
2025-07-02 00:00 UT   08 12 35.2   +12 49 40    10.340    9.416   23.4    2.5   119   24.8 

    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.