C/2025 D5 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	27 Mar 2025	21.0	2.092 AU	1.118 AU	11h35m	-15°10'	162.8°	8.1°	44°
Perihelion	13 May 2025	21.6	2.012 AU	1.563 AU	09h30m	-27°59'	100.7°	29.6°	105°
Today	14 Oct 2025	24.3	2.710 AU	2.942 AU	12h01m	-74°10'	66.9°	19.8°	201°

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. The light curve is based on the absolute magnitude and slope parameter as calculated from an MPEC, or the latest values provided by the minor planet center. (17.6 + 5 log[∆] + 10.0 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/2025 D5 (PANSTARRS) are:

    e (Eccentricity)                : 0.9993780
    q (Perihelion distance)         : 2.0121870
    i (Inclination)                 : 73.38060
    Ω (Longitude of ascending node) : 0.73590
    ω (Argument of perihelion)      : 211.49430
    L (Longitude of perihelion)     : 10.67492
    B (Latitude of perihelion)      : -30.03906
    T (Time of perihelion passage)  : 2460808.79260
    P (Orbital period in years)     : 183999.62

    Epoch                           : 2025 Oct 13
    Reference                       : MPC184415

    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
2025-10-14 00:00 UT   11 59 39.4   -73 55 56     2.938    2.706   66.8   19.8   201   24.3 
2025-10-14 13:33 UT   12 01 51.9   -74 10 39     2.942    2.710   66.9   19.8   201   24.3 
2025-10-15 00:00 UT   12 03 36.3   -74 21 59     2.945    2.714   66.9   19.8   201   24.3 
2025-10-16 00:00 UT   12 07 43.4   -74 47 54     2.953    2.721   66.9   19.7   200   24.3 
2025-10-17 00:00 UT   12 12 01.6   -75 13 41     2.960    2.729   66.9   19.6   200   24.3 
2025-10-18 00:00 UT   12 16 31.8   -75 39 18     2.968    2.736   67.0   19.6   200   24.3 
2025-10-19 00:00 UT   12 21 15.0   -76 04 45     2.976    2.744   67.0   19.5   200   24.4 
2025-10-20 00:00 UT   12 26 12.3   -76 29 59     2.984    2.751   67.0   19.5   199   24.4 
2025-10-21 00:00 UT   12 31 24.8   -76 55 00     2.991    2.759   67.0   19.4   199   24.4 
2025-10-22 00:00 UT   12 36 53.9   -77 19 45     2.999    2.767   67.0   19.3   198   24.4 
2025-10-23 00:00 UT   12 42 41.0   -77 44 13     3.007    2.774   67.0   19.3   198   24.4 
2025-10-24 00:00 UT   12 48 47.6   -78 08 21     3.016    2.782   67.0   19.2   197   24.4 

    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.