C/2019 K5 (Young)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	20 Jun 2019	15.7	2.057 AU	2.193 AU	01h12m	+08°56'	68.8°	27.4°	248°
Nearest approach	10 Oct 2019	15.7	2.437 AU	1.577 AU	03h35m	+03°03'	141.2°	14.9°	276°
Today	28 Nov 2025	28.7	17.402 AU	17.060 AU	09h06m	+05°20'	108.7°	3.1°	291°

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)                : 0.9877020
    q (Perihelion distance)         : 2.0571120
    i (Inclination)                 : 15.28460
    Ω (Longitude of ascending node) : 177.30630
    ω (Argument of perihelion)      : 175.12940
    L (Longitude of perihelion)     : 172.60720
    B (Latitude of perihelion)      : 1.28252
    T (Time of perihelion passage)  : 2458655.25930
    P (Orbital period in years)     : 2163.39

    Epoch                           : 2025 Nov 12
    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
2025-11-27 00:00 UT   09 06 13.2   +05 20 43    17.079   17.392  106.9    3.1   290   28.7 
2025-11-28 00:00 UT   09 06 09.6   +05 20 26    17.068   17.398  107.9    3.1   291   28.7 
2025-11-28 17:45 UT   09 06 06.8   +05 20 14    17.060   17.402  108.7    3.1   291   28.7 
2025-11-29 00:00 UT   09 06 05.8   +05 20 10    17.057   17.403  109.0    3.1   291   28.7 
2025-11-30 00:00 UT   09 06 01.8   +05 19 55    17.046   17.408  110.0    3.1   291   28.7 
2025-12-01 00:00 UT   09 05 57.5   +05 19 41    17.036   17.414  111.0    3.0   291   28.7 
2025-12-02 00:00 UT   09 05 53.1   +05 19 29    17.025   17.419  112.0    3.0   291   28.7 
2025-12-03 00:00 UT   09 05 48.4   +05 19 18    17.015   17.424  113.0    3.0   292   28.7 
2025-12-04 00:00 UT   09 05 43.5   +05 19 08    17.005   17.430  114.0    3.0   292   28.7 
2025-12-05 00:00 UT   09 05 38.3   +05 18 59    16.995   17.435  115.0    2.9   292   28.7 
2025-12-06 00:00 UT   09 05 33.0   +05 18 52    16.985   17.440  116.0    2.9   292   28.7 
2025-12-07 00:00 UT   09 05 27.5   +05 18 45    16.975   17.446  117.0    2.9   293   28.7 
2025-12-08 00:00 UT   09 05 21.7   +05 18 41    16.966   17.451  118.0    2.9   293   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.