174P/Echeclus
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	19 Apr 2015	12.7	5.867 AU	6.533 AU	22h58m	-05°21'	45.0°	7.0°	249°
Nearest approach	9 Sep 2015	12.1	5.906 AU	4.900 AU	23h19m	-03°53'	177.0°	0.5°	239°
Today	4 Aug 2025	23.7	13.640 AU	14.639 AU	08h17m	+16°26'	9.6°	0.7°	264°

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 174P/Echeclus are:

            e (Eccentricity)                : 0.4547310
            q (Perihelion distance)         : 5.8665610
            i (Inclination)                 : 4.34070
            Ω (Longitude of ascending node) : 173.34250
            ω (Argument of perihelion)      : 163.42610
            L (Longitude of perihelion)     : 156.81354
            B (Latitude of perihelion)      : 1.23710
            T (Time of perihelion passage)  : 2457131.87730
            P (Orbital period in years)     : 35.29

            Epoch                           : 2025 Jul 29
            Reference                       : MPC 92985

            Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); Halley type (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 (9.40 + 5 log[∆] + 5.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently -10.95 + 5 log[∆] + 25.44 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
2025-08-04 00:00 UT   08 17 40.6   +16 26 50    14.639   13.639    9.2    0.7   263   23.7 
2025-08-04 12:41 UT   08 17 50.8   +16 26 15    14.639   13.640    9.6    0.7   264   23.7 
2025-08-05 00:00 UT   08 17 60.0   +16 25 45    14.638   13.641   10.0    0.7   265   23.7 
2025-08-06 00:00 UT   08 18 19.4   +16 24 40    14.637   13.642   10.9    0.8   266   23.7 
2025-08-07 00:00 UT   08 18 38.7   +16 23 36    14.635   13.644   11.7    0.9   268   23.7 
2025-08-08 00:00 UT   08 18 58.0   +16 22 31    14.633   13.645   12.6    0.9   269   23.7 
2025-08-09 00:00 UT   08 19 17.3   +16 21 25    14.631   13.647   13.4    1.0   270   23.7 
2025-08-10 00:00 UT   08 19 36.4   +16 20 20    14.628   13.648   14.3    1.0   271   23.7 
2025-08-11 00:00 UT   08 19 55.5   +16 19 15    14.625   13.650   15.1    1.1   271   23.7 
2025-08-12 00:00 UT   08 20 14.6   +16 18 09    14.622   13.651   16.0    1.2   272   23.7 
2025-08-13 00:00 UT   08 20 33.5   +16 17 04    14.619   13.653   16.9    1.2   273   23.7 
2025-08-14 00:00 UT   08 20 52.4   +16 15 58    14.615   13.654   17.7    1.3   273   23.8 

    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.