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	15 Dec 2025	28.7	17.490 AU	16.899 AU	09h04m	+05°18'	125.5°	2.6°	295°

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
2025-12-14 00:00 UT   09 04 42.9   +05 18 38    16.911   17.483  124.1    2.7   294   28.7 
2025-12-15 00:00 UT   09 04 35.7   +05 18 42    16.902   17.488  125.2    2.6   295   28.7 
2025-12-15 07:42 UT   09 04 33.3   +05 18 43    16.899   17.490  125.5    2.6   295   28.7 
2025-12-16 00:00 UT   09 04 28.3   +05 18 47    16.894   17.493  126.2    2.6   295   28.7 
2025-12-17 00:00 UT   09 04 20.8   +05 18 53    16.886   17.499  127.2    2.6   295   28.7 
2025-12-18 00:00 UT   09 04 13.0   +05 19 01    16.878   17.504  128.2    2.5   296   28.7 
2025-12-19 00:00 UT   09 04 05.1   +05 19 10    16.870   17.509  129.2    2.5   296   28.7 
2025-12-20 00:00 UT   09 03 57.0   +05 19 21    16.862   17.514  130.2    2.5   296   28.7 
2025-12-21 00:00 UT   09 03 48.7   +05 19 32    16.855   17.520  131.3    2.4   297   28.7 
2025-12-22 00:00 UT   09 03 40.2   +05 19 45    16.848   17.525  132.3    2.4   297   28.7 
2025-12-23 00:00 UT   09 03 31.6   +05 19 59    16.841   17.530  133.3    2.3   297   28.7 
2025-12-24 00:00 UT   09 03 22.8   +05 20 15    16.834   17.536  134.3    2.3   298   28.7 
2025-12-25 00:00 UT   09 03 13.8   +05 20 32    16.827   17.541  135.3    2.3   298   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.