C/2017 T2 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	28 Dec 2019	9.8	2.328 AU	1.520 AU	03h34m	+53°26'	135.8°	17.1°	116°
Perihelion	5 May 2020	8.6	1.606 AU	1.696 AU	06h59m	+75°51'	67.4°	35.5°	67°
Today	25 Dec 2024	21.7	14.194 AU	14.927 AU	19h08m	-62°54'	40.4°	2.6°	162°

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/2017 T2 (PANSTARRS) are:

            e (Eccentricity)                : 0.9989500
            q (Perihelion distance)         : 1.6056790
            i (Inclination)                 : 57.29330
            Ω (Longitude of ascending node) : 64.45160
            ω (Argument of perihelion)      : 92.78960
            L (Longitude of perihelion)     : -20.39557
            B (Latitude of perihelion)      : 57.18772
            T (Time of perihelion passage)  : 2458975.19080
            P (Orbital period in years)     : 59800.41

            Epoch                           : 2024 Dec 24
            Reference                       : MPEC 2024-A43

            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 (5.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 5.69 + 5 log[∆] + 8.77 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
2024-12-25 00:00 UT   19 08 01.1   -62 54 50    14.922   14.190   40.5    2.6   161   21.7 
2024-12-25 16:16 UT   19 08 27.0   -62 54 28    14.927   14.194   40.4    2.6   162   21.7 
2024-12-26 00:00 UT   19 08 39.3   -62 54 18    14.930   14.196   40.4    2.6   162   21.7 
2024-12-27 00:00 UT   19 09 17.5   -62 53 47    14.937   14.202   40.3    2.6   164   21.7 
2024-12-28 00:00 UT   19 09 55.9   -62 53 19    14.944   14.208   40.2    2.6   165   21.7 
2024-12-29 00:00 UT   19 10 34.2   -62 52 52    14.951   14.214   40.2    2.6   166   21.7 
2024-12-30 00:00 UT   19 11 12.7   -62 52 28    14.957   14.220   40.1    2.6   168   21.7 
2024-12-31 00:00 UT   19 11 51.1   -62 52 05    14.963   14.226   40.1    2.6   169   21.7 
2025-01-01 00:00 UT   19 12 29.6   -62 51 45    14.970   14.232   40.1    2.6   170   21.7 
2025-01-02 00:00 UT   19 13 08.1   -62 51 27    14.976   14.238   40.1    2.6   172   21.7 
2025-01-03 00:00 UT   19 13 46.6   -62 51 10    14.981   14.244   40.1    2.6   173   21.7 
2025-01-04 00:00 UT   19 14 25.1   -62 50 56    14.987   14.250   40.2    2.6   174   21.7 

    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.