C/2019 Y5 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	15 Aug 2019	17.5	4.939 AU	4.930 AU	04h45m	-34°07'	84.6°	11.8°	249°
Nearest approach	9 Nov 2019	17.2	4.983 AU	4.340 AU	03h54m	-35°47'	125.6°	9.3°	343°
Today	27 Sep 2026	20.4	17.131 AU	16.894 AU	01h48m	+78°30'	102.0°	3.3°	204°

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 13.8 + 5 log[∆] + .4 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 Y5 (PANSTARRS) are:

    e (Eccentricity)                : 0.9926480
    q (Perihelion distance)         : 4.9387460
    i (Inclination)                 : 82.79780
    Ω (Longitude of ascending node) : 51.80180
    ω (Argument of perihelion)      : 303.69180
    L (Longitude of perihelion)     : 41.15200
    B (Latitude of perihelion)      : -55.63604
    T (Time of perihelion passage)  : 2458711.42320
    P (Orbital period in years)     : 17410.72

    Epoch                           : 2026 May 29
    Reference                       : MPC194165

    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
2026-09-26 00:00 UT   01 49 44.8   +78 28 44    16.897   17.125  101.4    3.3   206   20.4 
2026-09-27 00:00 UT   01 48 39.6   +78 30 12    16.894   17.130  101.9    3.3   204   20.4 
2026-09-27 07:17 UT   01 48 19.7   +78 30 38    16.894   17.131  102.0    3.3   204   20.4 
2026-09-28 00:00 UT   01 47 33.7   +78 31 36    16.892   17.135  102.4    3.3   203   20.4 
2026-09-29 00:00 UT   01 46 27.0   +78 32 57    16.889   17.140  102.8    3.3   202   20.4 
2026-09-30 00:00 UT   01 45 19.6   +78 34 13    16.886   17.144  103.3    3.3   201   20.4 
2026-10-01 00:00 UT   01 44 11.5   +78 35 25    16.884   17.149  103.7    3.3   200   20.4 
2026-10-02 00:00 UT   01 43 02.8   +78 36 32    16.881   17.154  104.2    3.2   199   20.4 
2026-10-03 00:00 UT   01 41 53.5   +78 37 36    16.879   17.159  104.6    3.2   197   20.4 
2026-10-04 00:00 UT   01 40 43.5   +78 38 35    16.877   17.164  105.1    3.2   196   20.4 
2026-10-05 00:00 UT   01 39 33.0   +78 39 29    16.874   17.169  105.5    3.2   195   20.4 
2026-10-06 00:00 UT   01 38 22.1   +78 40 19    16.872   17.174  105.9    3.2   194   20.4 
2026-10-07 00:00 UT   01 37 10.6   +78 41 05    16.870   17.179  106.3    3.2   192   20.4 

    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.