321P/SOHO
ephemeris date magn radius delta ra dec elong phase PA
Perihelion30 Jun 20126.70.047 AU0.993 AU06h28m+23°24'2.3°119.2°276°
Nearest approach26 Feb 201929.74.796 AU3.807 AU10h31m+05°36'176.6°0.7°27°
Today21 Nov 201930.34.799 AU5.058 AU11h14m+02°07'69.4°11.1°292°
321P/SOHO- 2019-11-21
astro.vanbuitenen.nl


 
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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 321P/SOHO, as provided by the minor planet center, are:

            e (eccentricity)                : 0.9805890
            q (perihelion distance)         : 0.0471140
            i (inclination)                 : 19.66850
            Ω (Longitude of ascending node) : 165.10120
            ω (Argument of perihelion)      : 172.58600
            L (Longitude of perihelion)     : 158.11536
            B (Latitude of perihelion)      : 2.48921
            T (Time of perihelion passage)  : 2456108.98610
            P (Orbital period in years)     : 3.78
            Epoch                           : 2012 Jul 12

            Family/Group:                   : Sungrazer
            Tisserand (Jupiter)             : 2.396
        

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 light curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the minor planet center. (20.00 + 5 log[∆] + 10.00 log[r]).


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   magn
2019-11-21 00:00 UT   11 14 50.6   +02 07 32     5.058    4.799   69.3   30.3 
2019-11-21 00:49 UT   11 14 51.1   +02 07 28     5.058    4.799   69.4   30.3 
2019-11-22 00:00 UT   11 15 04.6   +02 05 32     5.042    4.799   70.3   30.3 
2019-11-23 00:00 UT   11 15 17.9   +02 03 35     5.025    4.799   71.2   30.3 
2019-11-24 00:00 UT   11 15 30.5   +02 01 42     5.009    4.799   72.2   30.3 
2019-11-25 00:00 UT   11 15 42.5   +01 59 53     4.992    4.799   73.1   30.3 
2019-11-26 00:00 UT   11 15 53.9   +01 58 08     4.975    4.799   74.1   30.3 
2019-11-27 00:00 UT   11 16 04.5   +01 56 27     4.959    4.799   75.0   30.3 
2019-11-28 00:00 UT   11 16 14.5   +01 54 49     4.942    4.799   76.0   30.3 
2019-11-29 00:00 UT   11 16 23.7   +01 53 16     4.925    4.799   77.0   30.3 
2019-11-30 00:00 UT   11 16 32.3   +01 51 47     4.908    4.799   77.9   30.3 
2019-12-01 00:00 UT   11 16 40.1   +01 50 22     4.891    4.799   78.9   30.3 


    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 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.