C/2019 B3 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	3 May 2020	18.1	7.042 AU	6.529 AU	10h54m	-67°18'	116.9°	7.3°	65°
Perihelion	19 Jan 2021	18.1	6.830 AU	7.173 AU	16h31m	-83°25'	65.9°	7.6°	236°
Today	18 Sep 2025	21.8	12.471 AU	11.485 AU	23h55m	-12°56'	168.5°	0.9°	344°

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/2019 B3 (PANSTARRS) are:

            e (Eccentricity)                : 0.9979670
            q (Perihelion distance)         : 6.8304810
            i (Inclination)                 : 66.61400
            Ω (Longitude of ascending node) : 358.39980
            ω (Argument of perihelion)      : 264.00020
            L (Longitude of perihelion)     : 73.56891
            B (Latitude of perihelion)      : -65.89856
            T (Time of perihelion passage)  : 2459233.94360
            P (Orbital period in years)     : 194747.04

            Epoch                           : 2025 Sep 17
            Reference                       : MPEC 2024-JU4

            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 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. (5.50 + 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
2025-09-18 00:00 UT   23 55 17.4   -12 56 26    11.483   12.470  168.5    0.9   343   21.8 
2025-09-18 06:14 UT   23 55 12.4   -12 56 34    11.485   12.471  168.5    0.9   344   21.8 
2025-09-19 00:00 UT   23 54 58.1   -12 56 56    11.489   12.475  168.4    0.9   348   21.8 
2025-09-20 00:00 UT   23 54 38.8   -12 57 24    11.494   12.479  168.2    0.9   353   21.8 
2025-09-21 00:00 UT   23 54 19.5   -12 57 51    11.500   12.484  167.9    1.0   358   21.8 
2025-09-22 00:00 UT   23 54 00.2   -12 58 16    11.506   12.488  167.5    1.0     2   21.8 
2025-09-23 00:00 UT   23 53 40.9   -12 58 41    11.513   12.493  167.0    1.0     7   21.8 
2025-09-24 00:00 UT   23 53 21.7   -12 59 04    11.520   12.498  166.5    1.1    10   21.8 
2025-09-25 00:00 UT   23 53 02.5   -12 59 25    11.527   12.502  165.9    1.1    14   21.8 
2025-09-26 00:00 UT   23 52 43.3   -12 59 46    11.535   12.507  165.2    1.2    18   21.8 
2025-09-27 00:00 UT   23 52 24.2   -13 00 05    11.542   12.512  164.5    1.2    21   21.8 
2025-09-28 00:00 UT   23 52 05.2   -13 00 22    11.550   12.516  163.8    1.3    23   21.8 

    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.