C/2019 D1 (Flewelling)
ephemeris date magn radius delta ra dec elong phase PA
Perihelion8 May 201914.71.592 AU1.640 AU22h03m+21°15'69.3°36.4°259°
Nearest approach10 Sep 201917.42.283 AU1.561 AU01h12m+44°13'124.0°21.5°217°
Today16 Oct 202539.017.720 AU17.280 AU05h47m+03°14'114.7°2.9°278°
C/2019 D1 (Flewelling)- 2025-10-16
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 9.9 + 5 log[∆] + 18.4 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 D1 (Flewelling) are:

    e (Eccentricity)                : 0.9882500
    q (Perihelion distance)         : 1.5924070
    i (Inclination)                 : 34.02160
    Ω (Longitude of ascending node) : 231.68050
    ω (Argument of perihelion)      : 70.69950
    L (Longitude of perihelion)     : 298.77494
    B (Latitude of perihelion)      : 31.87448
    T (Time of perihelion passage)  : 2458611.88690
    P (Orbital period in years)     : 1577.70

    Epoch                           : 2025 Oct 15
    Reference                       : MPEC 2022-O08

    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
2025-10-16 00:00 UT   05 47 27.0   +03 15 31    17.285   17.717  114.2    2.9   278   39.0 
2025-10-16 12:55 UT   05 47 24.2   +03 14 52    17.280   17.720  114.7    2.9   278   39.0 
2025-10-17 00:00 UT   05 47 21.8   +03 14 18    17.276   17.723  115.1    2.9   279   39.0 
2025-10-18 00:00 UT   05 47 16.4   +03 13 04    17.267   17.728  116.1    2.9   279   39.0 
2025-10-19 00:00 UT   05 47 10.8   +03 11 51    17.259   17.733  117.0    2.9   279   39.0 
2025-10-20 00:00 UT   05 47 04.9   +03 10 39    17.250   17.739  117.9    2.8   280   39.0 
2025-10-21 00:00 UT   05 46 58.9   +03 09 27    17.241   17.744  118.9    2.8   280   39.0 
2025-10-22 00:00 UT   05 46 52.6   +03 08 15    17.233   17.749  119.8    2.8   281   39.0 
2025-10-23 00:00 UT   05 46 46.1   +03 07 04    17.225   17.755  120.7    2.8   281   39.0 
2025-10-24 00:00 UT   05 46 39.4   +03 05 53    17.217   17.760  121.7    2.7   282   39.0 
2025-10-25 00:00 UT   05 46 32.6   +03 04 43    17.209   17.765  122.6    2.7   282   39.0 
2025-10-26 00:00 UT   05 46 25.5   +03 03 34    17.201   17.770  123.5    2.7   283   39.0 



    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.