210P/Christensen
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	30 Jun 2025	18.9	2.285 AU	1.461 AU	21h57m	-21°31'	133.7°	18.8°	258°
Nearest approach	8 Nov 2025	8.2	0.604 AU	0.429 AU	15h45m	-32°34'	19.6°	146.5°	141°
Perihelion	22 Nov 2025	8.3	0.524 AU	0.525 AU	14h29m	-17°23'	19.8°	140.4°	281°

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.)

The orbital elements of 210P/Christensen are:

            e (Eccentricity)                : 0.8340720
            q (Perihelion distance)         : 0.5244460
            i (Inclination)                 : 10.28190
            Ω (Longitude of ascending node) : 93.82490
            ω (Argument of perihelion)      : 345.91740
            L (Longitude of perihelion)     : 79.95965
            B (Latitude of perihelion)      : -2.48917
            T (Time of perihelion passage)  : 2461002.21920
            P (Orbital period in years)     : 5.62

            Epoch                           : 2025 Jun 29
            Reference                       : MPC105242

            Classification(s):              : Ecliptic; Jupiter family
            Tisserand (Jupiter)             : 2.492
        

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC. The gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (13.50 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 13.97 + 5 log[∆] + 11.36 log[r]). The additional green curve shows the effect of forward scattering, occurring when the comet is between the earth and the sun, for a gas-to-dust light ratio δ90 of 0.30. (See Marcus 2007)

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.
A more printer-friendly version of the same chart can be found further down this page as well.

The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.

A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-06-30 00:00 UT   21 57 20.6   -21 29 19     1.465    2.287  133.5   18.8   258   18.9 
2025-06-30 05:21 UT   21 57 19.9   -21 31 05     1.461    2.285  133.7   18.8   258   18.9 
2025-07-01 00:00 UT   21 57 16.4   -21 37 22     1.446    2.277  134.5   18.6   258   18.8 
2025-07-02 00:00 UT   21 57 10.2   -21 45 44     1.426    2.266  135.5   18.3   259   18.8 
2025-07-03 00:00 UT   21 57 01.9   -21 54 25     1.407    2.255  136.5   18.1   259   18.7 
2025-07-04 00:00 UT   21 56 51.4   -22 03 25     1.388    2.245  137.5   17.8   260   18.7 
2025-07-05 00:00 UT   21 56 38.8   -22 12 44     1.369    2.234  138.5   17.6   260   18.6 
2025-07-06 00:00 UT   21 56 24.0   -22 22 24     1.350    2.223  139.5   17.3   261   18.6 
2025-07-07 00:00 UT   21 56 06.9   -22 32 23     1.332    2.213  140.5   17.0   261   18.5 
2025-07-08 00:00 UT   21 55 47.4   -22 42 44     1.313    2.202  141.5   16.7   262   18.5 
2025-07-09 00:00 UT   21 55 25.5   -22 53 25     1.295    2.191  142.5   16.4   263   18.4 
2025-07-10 00:00 UT   21 55 01.1   -23 04 27     1.277    2.180  143.6   16.1   263   18.3 

    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.