C/2019 K5 (Young)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	20 Jun 2019	15.7	2.057 AU	2.191 AU	01h12m	+08°57'	68.9°	27.5°	248°
Nearest approach	10 Oct 2019	15.7	2.436 AU	1.576 AU	03h35m	+03°03'	141.2°	14.9°	276°
Today	17 Oct 2025	28.7	17.175 AU	17.538 AU	09h05m	+05°47'	67.0°	3.1°	283°

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 11.2 + 5 log[∆] + 9.2 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 K5 (Young) are:

    e (Eccentricity)                : 0.9877220
    q (Perihelion distance)         : 2.0567940
    i (Inclination)                 : 15.28610
    Ω (Longitude of ascending node) : 177.30070
    ω (Argument of perihelion)      : 175.13300
    L (Longitude of perihelion)     : 172.60510
    B (Latitude of perihelion)      : 1.28170
    T (Time of perihelion passage)  : 2458655.36930
    P (Orbital period in years)     : 2168.18

    Epoch                           : 2025 Oct 15
    Reference                       : MPEC 2021-P47

    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
2025-10-16 00:00 UT   09 05 18.8   +05 48 30    17.550   17.168   65.9    3.0   282   28.7 
2025-10-17 00:00 UT   09 05 24.6   +05 47 33    17.540   17.174   66.9    3.1   283   28.7 
2025-10-17 04:15 UT   09 05 25.6   +05 47 23    17.538   17.175   67.0    3.1   283   28.7 
2025-10-18 00:00 UT   09 05 30.2   +05 46 36    17.530   17.179   67.8    3.1   283   28.7 
2025-10-19 00:00 UT   09 05 35.6   +05 45 41    17.519   17.184   68.8    3.1   283   28.7 
2025-10-20 00:00 UT   09 05 40.8   +05 44 45    17.509   17.190   69.7    3.1   283   28.7 
2025-10-21 00:00 UT   09 05 45.8   +05 43 51    17.498   17.195   70.7    3.1   283   28.7 
2025-10-22 00:00 UT   09 05 50.5   +05 42 57    17.488   17.201   71.6    3.1   284   28.7 
2025-10-23 00:00 UT   09 05 55.1   +05 42 04    17.477   17.206   72.6    3.2   284   28.7 
2025-10-24 00:00 UT   09 05 59.4   +05 41 12    17.466   17.211   73.5    3.2   284   28.7 
2025-10-25 00:00 UT   09 06 03.5   +05 40 21    17.455   17.217   74.5    3.2   284   28.7 
2025-10-26 00:00 UT   09 06 07.4   +05 39 30    17.444   17.222   75.5    3.2   284   28.7 
2025-10-27 00:00 UT   09 06 11.1   +05 38 40    17.433   17.227   76.4    3.2   285   28.7 

    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.