15P/Finlay
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	17 Jun 2021	11.5	1.063 AU	1.094 AU	01h42m	+05°42'	60.4°	56.2°	246°
Perihelion	13 Jul 2021	11.1	0.995 AU	1.165 AU	03h40m	+18°20'	53.7°	55.5°	256°
Today	9 May 2024	29.4	5.940 AU	5.395 AU	11h15m	+07°16'	118.3°	8.6°	114°

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 15P/Finlay are:

            e (Eccentricity)                : 0.7166170
            q (Perihelion distance)         : 0.9946310
            i (Inclination)                 : 6.79320
            Ω (Longitude of ascending node) : 13.73900
            ω (Argument of perihelion)      : 347.87540
            L (Longitude of perihelion)     : 1.69703
            B (Latitude of perihelion)      : -1.42364
            T (Time of perihelion passage)  : 2459408.90930
            P (Orbital period in years)     : 6.58

            Epoch                           : 2024 May 08
            Reference                       : MPEC 2022-ED3

            Classification(s):              : Ecliptic; Jupiter family
            Tisserand (Jupiter)             : 2.620
        

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 (12.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 10.79 + 5 log[∆] + 19.26 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
2024-05-09 00:00 UT   11 15 58.1   +07 16 08     5.392    5.940  118.5    8.6   114   29.4 
2024-05-09 05:03 UT   11 15 55.7   +07 16 15     5.395    5.940  118.3    8.6   114   29.4 
2024-05-10 00:00 UT   11 15 46.9   +07 16 37     5.407    5.941  117.5    8.7   114   29.4 
2024-05-11 00:00 UT   11 15 36.3   +07 17 02     5.423    5.942  116.5    8.8   114   29.4 
2024-05-12 00:00 UT   11 15 26.4   +07 17 23     5.438    5.943  115.5    8.8   114   29.4 
2024-05-13 00:00 UT   11 15 17.1   +07 17 40     5.454    5.944  114.5    8.9   114   29.4 
2024-05-14 00:00 UT   11 15 08.5   +07 17 52     5.470    5.945  113.5    9.0   114   29.4 
2024-05-15 00:00 UT   11 15 00.5   +07 18 00     5.486    5.946  112.5    9.0   114   29.4 
2024-05-16 00:00 UT   11 14 53.3   +07 18 04     5.502    5.947  111.5    9.1   114   29.4 
2024-05-17 00:00 UT   11 14 46.6   +07 18 04     5.518    5.948  110.5    9.2   114   29.4 
2024-05-18 00:00 UT   11 14 40.7   +07 18 00     5.534    5.949  109.5    9.2   114   29.4 
2024-05-19 00:00 UT   11 14 35.4   +07 17 52     5.551    5.950  108.5    9.3   114   29.4 

    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.