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C/2019 V1 (Borisov)
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach30 Dec 201919.13.646 AU2.698 AU 05h19m+29°30'162.0°4.8°106°
Perihelion17 Jul 202019.23.093 AU3.894 AU 08h20m+53°39'33.1°10.3°13°
Today21 Oct 202528.814.527 AU15.134 AU 17h10m-19°48'50.9°3.0°92°
C/2019 V1 (Borisov)- 2025-10-21
astro.vanbuitenen.nl


 
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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. This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 11.3 + 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 C/2019 V1 (Borisov) are: 

    e (Eccentricity)                : 0.9989600
    q (Perihelion distance)         : 3.0929500
    i (Inclination)                 : 61.94620
    Ω (Longitude of ascending node) : 83.14830
    ω (Argument of perihelion)      : 51.20120
    L (Longitude of perihelion)     : 113.47426
    B (Latitude of perihelion)      : 43.45481
    T (Time of perihelion passage)  : 2459048.29950
    P (Orbital period in years)     : 162184.50

    Epoch                           : 2025 Oct 20
    Reference                       : MPEC 2022-N37

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-10-20 00:00 UT   17 10 19.0   -19 47 22    15.114   14.521   51.9    3.1    92   28.8 
2025-10-21 00:00 UT   17 10 31.0   -19 48 22    15.133   14.527   50.9    3.1    92   28.8 
2025-10-21 00:58 UT   17 10 31.5   -19 48 25    15.134   14.527   50.9    3.0    92   28.8 
2025-10-22 00:00 UT   17 10 43.1   -19 49 22    15.152   14.532   50.0    3.0    92   28.8 
2025-10-23 00:00 UT   17 10 55.5   -19 50 22    15.170   14.538   49.0    3.0    92   28.8 
2025-10-24 00:00 UT   17 11 08.0   -19 51 21    15.189   14.544   48.1    2.9    92   28.8 
2025-10-25 00:00 UT   17 11 20.8   -19 52 21    15.207   14.549   47.2    2.9    92   28.8 
2025-10-26 00:00 UT   17 11 33.7   -19 53 20    15.225   14.555   46.2    2.8    92   28.8 
2025-10-27 00:00 UT   17 11 46.8   -19 54 19    15.243   14.561   45.3    2.8    92   28.8 
2025-10-28 00:00 UT   17 12 00.1   -19 55 18    15.260   14.566   44.3    2.7    92   28.9 
2025-10-29 00:00 UT   17 12 13.5   -19 56 17    15.278   14.572   43.4    2.7    92   28.9 
2025-10-30 00:00 UT   17 12 27.1   -19 57 16    15.295   14.578   42.4    2.6    91   28.9 
2025-10-31 00:00 UT   17 12 40.9   -19 58 15    15.312   14.583   41.5    2.6    91   28.9 




    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.

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