210P/Christensen
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	8 Nov 2025	9.4	0.604 AU	0.429 AU	15h45m	-32°34'	19.6°	146.5°	141°
Perihelion	22 Nov 2025	9.8	0.524 AU	0.525 AU	14h29m	-17°22'	19.8°	140.4°	281°
Today	29 Apr 2026	18.3	2.417 AU	1.431 AU	14h27m	+01°01'	164.4°	6.4°	180°

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 14.5 + 5 log[∆] + 8.0 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 210P/Christensen are:

    e (Eccentricity)                : 0.8340420
    q (Perihelion distance)         : 0.5244430
    i (Inclination)                 : 10.28720
    Ω (Longitude of ascending node) : 93.79660
    ω (Argument of perihelion)      : 345.94900
    L (Longitude of perihelion)     : 79.96273
    B (Latitude of perihelion)      : -2.48496
    T (Time of perihelion passage)  : 2461002.22400
    P (Orbital period in years)     : 5.62

    Epoch                           : 2026 Apr 29
    Reference                       : MPEC 2026-G41

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.493

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-04-28 00:00 UT   14 30 49.7   +00 54 42     1.410    2.396  164.9    6.3   190   18.3 
2026-04-29 00:00 UT   14 29 13.3   +00 58 11     1.421    2.407  164.7    6.3   185   18.3 
2026-04-29 23:58 UT   14 27 38.3   +01 01 26     1.431    2.417  164.4    6.4   180   18.3 
2026-04-30 00:00 UT   14 27 38.2   +01 01 26     1.431    2.417  164.4    6.4   180   18.3 
2026-05-01 00:00 UT   14 26 04.6   +01 04 28     1.442    2.427  164.0    6.6   175   18.4 
2026-05-02 00:00 UT   14 24 32.4   +01 07 16     1.454    2.437  163.5    6.8   171   18.4 
2026-05-03 00:00 UT   14 23 01.9   +01 09 50     1.466    2.447  162.9    7.0   167   18.4 
2026-05-04 00:00 UT   14 21 32.9   +01 12 12     1.478    2.457  162.2    7.2   163   18.5 
2026-05-05 00:00 UT   14 20 05.6   +01 14 20     1.490    2.467  161.5    7.5   159   18.5 
2026-05-06 00:00 UT   14 18 40.1   +01 16 14     1.502    2.477  160.7    7.7   156   18.5 
2026-05-07 00:00 UT   14 17 16.2   +01 17 56     1.515    2.487  159.8    8.0   153   18.6 
2026-05-08 00:00 UT   14 15 54.2   +01 19 24     1.528    2.497  159.0    8.3   151   18.6 
2026-05-09 00:00 UT   14 14 34.0   +01 20 40     1.542    2.507  158.0    8.7   148   18.6 

    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.