C/2019 D1 (Flewelling)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	8 May 2019	14.7	1.592 AU	1.633 AU	22h04m	+21°26'	69.6°	36.5°	259°
Nearest approach	10 Sep 2019	17.4	2.276 AU	1.556 AU	01h11m	+44°19'	123.9°	21.6°	216°
Today	9 May 2025	38.7	16.858 AU	17.658 AU	05h24m	+04°52'	36.6°	2.0°	113°

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 D1 (Flewelling) are:

            e (Eccentricity)                : 0.9883570
            q (Perihelion distance)         : 1.5920680
            i (Inclination)                 : 34.00930
            Ω (Longitude of ascending node) : 231.66410
            ω (Argument of perihelion)      : 70.71920
            L (Longitude of perihelion)     : 298.78416
            B (Latitude of perihelion)      : 31.86743
            T (Time of perihelion passage)  : 2458612.39870
            P (Orbital period in years)     : 1598.99

            Epoch                           : 2025 May 08
            Reference                       : MPEC 2022-O08

            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 gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (13.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 9.88 + 5 log[∆] + 18.40 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
2025-05-09 00:00 UT   05 24 46.5   +04 52 14    17.654   16.857   36.8    2.1   113   38.7 
2025-05-09 05:59 UT   05 24 49.6   +04 52 22    17.658   16.858   36.6    2.0   113   38.7 
2025-05-10 00:00 UT   05 24 58.9   +04 52 48    17.668   16.862   36.0    2.0   113   38.7 
2025-05-11 00:00 UT   05 25 11.5   +04 53 22    17.682   16.868   35.2    2.0   114   38.7 
2025-05-12 00:00 UT   05 25 24.1   +04 53 54    17.696   16.873   34.5    1.9   115   38.7 
2025-05-13 00:00 UT   05 25 36.9   +04 54 26    17.709   16.879   33.7    1.9   116   38.7 
2025-05-14 00:00 UT   05 25 49.7   +04 54 57    17.723   16.884   33.0    1.9   117   38.7 
2025-05-15 00:00 UT   05 26 02.6   +04 55 27    17.736   16.890   32.2    1.8   118   38.7 
2025-05-16 00:00 UT   05 26 15.6   +04 55 56    17.748   16.895   31.5    1.8   119   38.7 
2025-05-17 00:00 UT   05 26 28.7   +04 56 24    17.761   16.900   30.8    1.8   120   38.7 
2025-05-18 00:00 UT   05 26 41.9   +04 56 52    17.773   16.906   30.0    1.7   121   38.7 
2025-05-19 00:00 UT   05 26 55.1   +04 57 18    17.785   16.911   29.3    1.7   122   38.7 

    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.