C/2016 R2 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	22 Dec 2017	11.6	2.973 AU	2.050 AU	04h34m	+10°59'	155.5°	7.9°	57°
Perihelion	9 May 2018	11.9	2.595 AU	3.270 AU	05h30m	+44°56'	41.0°	14.8°	60°
Today	27 Jul 2024	25.0	16.718 AU	16.105 AU	16h43m	-10°44'	125.6°	2.8°	106°

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/2016 R2 (PANSTARRS) are:

            e (Eccentricity)                : 0.9946790
            q (Perihelion distance)         : 2.5945740
            i (Inclination)                 : 58.37140
            Ω (Longitude of ascending node) : 80.49850
            ω (Argument of perihelion)      : 33.08980
            L (Longitude of perihelion)     : 99.36514
            B (Latitude of perihelion)      : 27.70115
            T (Time of perihelion passage)  : 2458248.15790
            P (Orbital period in years)     : 10767.36

            Epoch                           : 2023 Sep 24
            Reference                       : MPEC 2021-N06

            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 (7.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 4.35 + 5 log[∆] + 11.97 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
2024-07-27 00:00 UT   16 43 17.0   -10 44 18    16.102   16.717  125.8    2.8   106   25.0 
2024-07-27 04:34 UT   16 43 15.5   -10 44 27    16.105   16.718  125.6    2.8   106   25.0 
2024-07-28 00:00 UT   16 43 09.2   -10 45 04    16.121   16.722  124.9    2.9   106   25.0 
2024-07-29 00:00 UT   16 43 01.6   -10 45 50    16.140   16.728  123.9    2.9   105   25.0 
2024-07-30 00:00 UT   16 42 54.3   -10 46 37    16.159   16.733  122.9    2.9   105   25.0 
2024-07-31 00:00 UT   16 42 47.2   -10 47 25    16.178   16.738  122.0    2.9   105   25.0 
2024-08-01 00:00 UT   16 42 40.3   -10 48 13    16.197   16.744  121.0    3.0   105   25.0 
2024-08-02 00:00 UT   16 42 33.6   -10 49 02    16.217   16.749  120.1    3.0   104   25.0 
2024-08-03 00:00 UT   16 42 27.2   -10 49 52    16.237   16.755  119.1    3.0   104   25.0 
2024-08-04 00:00 UT   16 42 21.0   -10 50 42    16.257   16.760  118.2    3.1   104   25.1 
2024-08-05 00:00 UT   16 42 15.0   -10 51 33    16.277   16.765  117.2    3.1   104   25.1 
2024-08-06 00:00 UT   16 42 09.2   -10 52 25    16.297   16.771  116.3    3.1   103   25.1 

    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.