C/2015 V4 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	27 Aug 2016	19.8	5.456 AU	6.214 AU	09h09m	-23°28'	38.2°	6.6°	212°
Nearest approach	1 Mar 2017	19.3	5.574 AU	4.740 AU	09h54m	-25°41'	144.3°	6.0°	23°
Today	1 Apr 2025	26.5	15.880 AU	15.525 AU	16h51m	+36°46'	109.1°	3.4°	249°

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/2015 V4 (PANSTARRS) are:

            e (Eccentricity)                : 0.7043240
            q (Perihelion distance)         : 5.4561580
            i (Inclination)                 : 60.79850
            Ω (Longitude of ascending node) : 179.95140
            ω (Argument of perihelion)      : 306.90560
            L (Longitude of perihelion)     : 146.94098
            B (Latitude of perihelion)      : -44.26684
            T (Time of perihelion passage)  : 2457628.43080
            P (Orbital period in years)     : 79.27

            Epoch                           : 2021 Sep 25
            Reference                       : MPC104791

            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. (8.50 + 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
2025-04-01 00:00 UT   16 51 06.3   +36 44 45    15.527   15.878  108.8    3.4   249   26.5 
2025-04-01 14:58 UT   16 51 03.2   +36 46 43    15.525   15.880  109.1    3.4   249   26.5 
2025-04-02 00:00 UT   16 51 01.3   +36 47 54    15.523   15.881  109.2    3.4   248   26.5 
2025-04-03 00:00 UT   16 50 55.9   +36 51 02    15.520   15.884  109.7    3.4   247   26.5 
2025-04-04 00:00 UT   16 50 50.2   +36 54 08    15.516   15.888  110.1    3.4   246   26.5 
2025-04-05 00:00 UT   16 50 44.3   +36 57 13    15.513   15.891  110.5    3.4   245   26.5 
2025-04-06 00:00 UT   16 50 38.0   +37 00 16    15.510   15.894  110.9    3.4   244   26.5 
2025-04-07 00:00 UT   16 50 31.5   +37 03 17    15.507   15.897  111.3    3.4   243   26.5 
2025-04-08 00:00 UT   16 50 24.7   +37 06 17    15.504   15.901  111.6    3.4   242   26.5 
2025-04-09 00:00 UT   16 50 17.6   +37 09 16    15.501   15.904  112.0    3.3   241   26.5 
2025-04-10 00:00 UT   16 50 10.2   +37 12 12    15.498   15.907  112.4    3.3   240   26.5 
2025-04-11 00:00 UT   16 50 02.5   +37 15 07    15.496   15.910  112.8    3.3   239   26.5 

    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.