C/2019 D1 (Flewelling)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	7 May 2019	14.7	1.592 AU	1.646 AU	22h03m	+21°04'	68.9°	36.3°	259°
Nearest approach	10 Sep 2019	17.4	2.290 AU	1.567 AU	01h13m	+44°07'	124.1°	21.3°	217°
Today	24 Jun 2026	39.8	19.028 AU	19.976 AU	05h41m	+04°06'	20.5°	1.1°	199°

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)                : 0.9881120
    q (Perihelion distance)         : 1.5915730
    i (Inclination)                 : 34.05000
    Ω (Longitude of ascending node) : 231.71940
    ω (Argument of perihelion)      : 70.64420
    L (Longitude of perihelion)     : 298.74340
    B (Latitude of perihelion)      : 31.88857
    T (Time of perihelion passage)  : 2458611.30140
    P (Orbital period in years)     : 1549.09

    Epoch                           : 2026 May 29
    Reference                       : MPC194160

    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
2026-06-23 00:00 UT   05 41 37.2   +04 07 05    19.972   19.022   20.1    1.1   196   39.8 
2026-06-24 00:00 UT   05 41 49.8   +04 06 56    19.976   19.027   20.4    1.1   198   39.8 
2026-06-24 02:34 UT   05 41 51.1   +04 06 55    19.976   19.028   20.5    1.1   199   39.8 
2026-06-25 00:00 UT   05 42 02.4   +04 06 46    19.979   19.032   20.7    1.1   201   39.9 
2026-06-26 00:00 UT   05 42 14.9   +04 06 35    19.982   19.038   21.1    1.1   203   39.9 
2026-06-27 00:00 UT   05 42 27.4   +04 06 24    19.984   19.043   21.5    1.1   205   39.9 
2026-06-28 00:00 UT   05 42 39.9   +04 06 11    19.987   19.048   21.9    1.1   208   39.9 
2026-06-29 00:00 UT   05 42 52.3   +04 05 57    19.989   19.053   22.3    1.2   210   39.9 
2026-06-30 00:00 UT   05 43 04.7   +04 05 43    19.991   19.058   22.8    1.2   212   39.9 
2026-07-01 00:00 UT   05 43 17.1   +04 05 27    19.992   19.063   23.3    1.2   214   39.9 
2026-07-02 00:00 UT   05 43 29.4   +04 05 11    19.994   19.068   23.8    1.2   216   39.9 
2026-07-03 00:00 UT   05 43 41.6   +04 04 53    19.995   19.073   24.3    1.3   217   39.9 
2026-07-04 00:00 UT   05 43 53.8   +04 04 35    19.996   19.079   24.8    1.3   219   39.9 

    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.