185P/Petriew
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	23 Apr 2026	23.2	5.266 AU	4.264 AU	14h22m	-13°18'	175.1°	0.9°	279°
Perihelion	26 Dec 2028	12.4	0.933 AU	0.942 AU	22h19m	-10°55'	57.9°	63.3°	69°
Nearest approach	21 Jan 2029	12.5	1.008 AU	0.865 AU	00h39m	-06°22'	65.7°	62.9°	71°

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 12.8 + 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 185P/Petriew are:

    e (Eccentricity)                : 0.6991000
    q (Perihelion distance)         : 0.9328840
    i (Inclination)                 : 14.00280
    Ω (Longitude of ascending node) : 214.12450
    ω (Argument of perihelion)      : 181.92440
    L (Longitude of perihelion)     : 215.99176
    B (Latitude of perihelion)      : -0.46556
    T (Time of perihelion passage)  : 2462131.97740
    P (Orbital period in years)     : 5.46

    Epoch                           : 2026 Apr 22
    Reference                       : MPC191609

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.749

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-04-22 00:00 UT   14 23 31.6   -13 24 18     4.267    5.267  173.5    1.2   282   23.2 
2026-04-23 00:00 UT   14 22 51.9   -13 20 08     4.265    5.266  174.6    1.0   280   23.2 
2026-04-23 10:55 UT   14 22 33.8   -13 18 15     4.264    5.266  175.1    0.9   279   23.2 
2026-04-24 00:00 UT   14 22 12.1   -13 15 58     4.263    5.266  175.8    0.8   278   23.2 
2026-04-25 00:00 UT   14 21 32.3   -13 11 47     4.262    5.266  176.9    0.6   273   23.2 
2026-04-26 00:00 UT   14 20 52.3   -13 07 35     4.260    5.266  178.0    0.4   264   23.2 
2026-04-27 00:00 UT   14 20 12.4   -13 03 23     4.260    5.266  178.9    0.2   238   23.2 
2026-04-28 00:00 UT   14 19 32.5   -12 59 11     4.259    5.266  179.0    0.2   173   23.2 
2026-04-29 00:00 UT   14 18 52.6   -12 54 58     4.259    5.266  178.2    0.3   139   23.2 
2026-04-30 00:00 UT   14 18 12.7   -12 50 46     4.259    5.265  177.1    0.6   128   23.2 
2026-05-01 00:00 UT   14 17 32.9   -12 46 33     4.260    5.265  176.0    0.8   123   23.2 
2026-05-02 00:00 UT   14 16 53.2   -12 42 21     4.261    5.265  174.9    1.0   120   23.2 
2026-05-03 00:00 UT   14 16 13.6   -12 38 09     4.262    5.265  173.8    1.2   118   23.2 

    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.