P/2017 G1 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	1 Jul 2026	29.4	11.846 AU	10.873 AU	19h51m	-16°44'	162.5°	1.5°	246°
Perihelion	7 Aug 2035	20.2	2.510 AU	3.471 AU	08h00m	+17°51'	15.8°	6.3°	272°
Nearest approach	25 Feb 2036	19.9	3.045 AU	2.096 AU	11h29m	-04°40'	160.0°	6.4°	314°

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.)

Light curve

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS. 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. (13.5 + 5 log[∆] + 10.0 log[r]). An additional green curve is displayed when an increase in apparent brightness is expected due to forward scattering of sunlight, which occurs when a dust-rich comet is located between the Earth and the Sun. (See Marcus 2007)

Charts

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.

Orbital elements

The orbital elements of P/2017 G1 (PANSTARRS) are:

    e (Eccentricity)                : 0.6510050
    q (Perihelion distance)         : 2.5098560
    i (Inclination)                 : 5.15260
    Ω (Longitude of ascending node) : 247.10860
    ω (Argument of perihelion)      : 225.31440
    L (Longitude of perihelion)     : 292.30701
    B (Latitude of perihelion)      : -3.66093
    T (Time of perihelion passage)  : 2464546.71710
    P (Orbital period in years)     : 19.29

    Epoch                           : 2026 May 29
    Reference                       : MPC194151

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.501

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-06-30 00:00 UT   19 51 36.6   -16 42 57    10.883   11.847  160.7    1.6   247   29.4 
2026-07-01 00:00 UT   19 51 19.4   -16 43 33    10.877   11.847  161.7    1.5   247   29.4 
2026-07-01 19:27 UT   19 51 05.5   -16 44 02    10.873   11.846  162.5    1.5   246   29.4 
2026-07-02 00:00 UT   19 51 02.2   -16 44 09    10.872   11.846  162.7    1.5   246   29.4 
2026-07-03 00:00 UT   19 50 44.9   -16 44 46    10.867   11.846  163.7    1.4   245   29.4 
2026-07-04 00:00 UT   19 50 27.4   -16 45 24    10.862   11.846  164.7    1.3   244   29.4 
2026-07-05 00:00 UT   19 50 09.8   -16 46 02    10.858   11.846  165.7    1.2   243   29.4 
2026-07-06 00:00 UT   19 49 52.1   -16 46 41    10.854   11.845  166.7    1.1   241   29.4 
2026-07-07 00:00 UT   19 49 34.3   -16 47 20    10.850   11.845  167.6    1.1   240   29.4 
2026-07-08 00:00 UT   19 49 16.5   -16 47 60    10.847   11.845  168.6    1.0   238   29.4 
2026-07-09 00:00 UT   19 48 58.5   -16 48 40    10.843   11.844  169.5    0.9   236   29.4 
2026-07-10 00:00 UT   19 48 40.5   -16 49 21    10.840   11.844  170.5    0.8   234   29.4 
2026-07-11 00:00 UT   19 48 22.5   -16 50 02    10.838   11.844  171.4    0.7   231   29.4 

    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.