C/2019 O3 (Palomar)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	23 Jul 2020	16.4	8.918 AU	8.274 AU	19h24m	+32°05'	126.7°	5.2°	166°
Perihelion	7 Mar 2021	16.6	8.820 AU	9.208 AU	19h42m	+36°06'	64.1°	5.8°	298°
Today	20 Oct 2025	20.7	12.897 AU	12.969 AU	10h34m	+65°56'	83.6°	4.4°	314°

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 -7.3 + 5 log[∆] + 20.2 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 O3 (Palomar) are:

    e (Eccentricity)                : 1.0022770
    q (Perihelion distance)         : 8.8204670
    i (Inclination)                 : 89.79270
    Ω (Longitude of ascending node) : 300.48090
    ω (Argument of perihelion)      : 60.08940
    L (Longitude of perihelion)     : 300.84125
    B (Latitude of perihelion)      : 60.08875
    T (Time of perihelion passage)  : 2459281.49890

    Epoch                           : 2025 Oct 19
    Reference                       : MPC182878

    Classification(s):              : Nearly isotropic; New (a > 10000 AU)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-10-19 00:00 UT   10 34 05.0   +65 54 15    12.980   12.891   82.7    4.4   315   20.7 
2025-10-20 00:00 UT   10 34 21.6   +65 55 32    12.973   12.895   83.3    4.4   315   20.7 
2025-10-20 12:13 UT   10 34 29.9   +65 56 13    12.969   12.897   83.6    4.4   314   20.7 
2025-10-21 00:00 UT   10 34 37.7   +65 56 53    12.966   12.899   83.9    4.4   314   20.7 
2025-10-22 00:00 UT   10 34 53.3   +65 58 17    12.959   12.902   84.5    4.4   313   20.7 
2025-10-23 00:00 UT   10 35 08.3   +65 59 44    12.952   12.906   85.1    4.4   312   20.7 
2025-10-24 00:00 UT   10 35 22.9   +66 01 14    12.945   12.910   85.8    4.4   312   20.7 
2025-10-25 00:00 UT   10 35 36.8   +66 02 47    12.938   12.914   86.4    4.4   311   20.7 
2025-10-26 00:00 UT   10 35 50.2   +66 04 24    12.931   12.918   87.0    4.4   310   20.7 
2025-10-27 00:00 UT   10 36 03.1   +66 06 03    12.924   12.922   87.6    4.4   309   20.7 
2025-10-28 00:00 UT   10 36 15.4   +66 07 46    12.917   12.925   88.2    4.4   309   20.7 
2025-10-29 00:00 UT   10 36 27.1   +66 09 32    12.910   12.929   88.9    4.4   308   20.7 
2025-10-30 00:00 UT   10 36 38.3   +66 11 21    12.903   12.933   89.5    4.4   307   20.7 

    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.