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	29 Jul 2026	39.9	19.208 AU	19.940 AU	05h48m	+03°51'	42.8°	2.1°	246°

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
2026-07-28 00:00 UT   05 48 24.8   +03 52 27    19.946   19.201   41.7    2.0   245   39.9 
2026-07-29 00:00 UT   05 48 34.9   +03 51 45    19.942   19.206   42.5    2.0   246   39.9 
2026-07-29 08:47 UT   05 48 38.6   +03 51 30    19.940   19.208   42.8    2.1   246   39.9 
2026-07-30 00:00 UT   05 48 44.9   +03 51 03    19.937   19.211   43.3    2.1   247   39.9 
2026-07-31 00:00 UT   05 48 54.7   +03 50 20    19.931   19.217   44.1    2.1   247   39.9 
2026-08-01 00:00 UT   05 49 04.4   +03 49 36    19.926   19.222   45.0    2.1   248   39.9 
2026-08-02 00:00 UT   05 49 14.0   +03 48 51    19.920   19.227   45.8    2.2   249   39.9 
2026-08-03 00:00 UT   05 49 23.5   +03 48 05    19.915   19.232   46.6    2.2   249   39.9 
2026-08-04 00:00 UT   05 49 32.9   +03 47 19    19.909   19.237   47.4    2.2   250   39.9 
2026-08-05 00:00 UT   05 49 42.1   +03 46 32    19.902   19.242   48.2    2.3   250   39.9 
2026-08-06 00:00 UT   05 49 51.2   +03 45 44    19.896   19.247   49.0    2.3   251   39.9 
2026-08-07 00:00 UT   05 50 00.1   +03 44 55    19.890   19.252   49.9    2.3   251   39.9 
2026-08-08 00:00 UT   05 50 08.9   +03 44 05    19.883   19.257   50.7    2.3   252   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.