(747) Winchester
ephemeris date magn radius delta ra dec elong phase
Opposition2 Sep 202511.02.318 AU1.335 AU23h17m-23°10'162.8°7.4°
Today10 Oct 202511.42.203 AU1.393 AU22h55m-28°54'133.5°19.2°
(747) Winchester - 2025-10-10
astro.vanbuitenen.nl


 
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The interactive orbit chart above shows the body'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 Winchester are:

            e (Eccentricity)                : 0.3396931
            a (Semimajor axis)              : 2.9989620
            i (Inclination)                 : 18.22142
            Ω (Longitude of ascending node) : 129.04941
            ω (Argument of perihelion)      : 277.64614
            M (Mean anomaly)                : 341.52272
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 47.09405
            B (Latitude of perihelion)      : -18.05380
            P (Orbital period in years)     : 5.19            
        

The light curve chart below shows the estimated development of the minor planet's magnitude.


The all-sky chart below shows the path of the minor planet over the same period as the light curve. The current position is marked yellow.





The following chart shows the path of the minor planet in the next few days. The field of view is optimized for (~10x50) binoculars and finderscopes. A more printer-friendly version of the same chart can be found below.




Ephemerides:
Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-10-10 00:00 UT   22 55 58.8   -28 54 18     1.393    2.203  133.5   19.2    45   11.4 
2025-10-10 04:45 UT   22 55 55.6   -28 54 50     1.394    2.202  133.3   19.3    45   11.4 
2025-10-11 00:00 UT   22 55 43.2   -28 56 51     1.398    2.200  132.6   19.5    46   11.5 
2025-10-12 00:00 UT   22 55 29.4   -28 59 03     1.403    2.197  131.6   19.9    47   11.5 
2025-10-13 00:00 UT   22 55 17.2   -29 00 54     1.409    2.194  130.7   20.2    47   11.5 
2025-10-14 00:00 UT   22 55 06.8   -29 02 23     1.415    2.191  129.8   20.5    48   11.5 
2025-10-15 00:00 UT   22 54 58.2   -29 03 32     1.421    2.188  128.8   20.8    49   11.5 
2025-10-16 00:00 UT   22 54 51.3   -29 04 20     1.426    2.186  127.9   21.1    49   11.5 
2025-10-17 00:00 UT   22 54 46.3   -29 04 47     1.433    2.183  127.0   21.4    50   11.5 
2025-10-18 00:00 UT   22 54 43.1   -29 04 55     1.439    2.180  126.1   21.7    50   11.6 
2025-10-19 00:00 UT   22 54 41.7   -29 04 42     1.445    2.177  125.2   21.9    51   11.6 
2025-10-20 00:00 UT   22 54 42.2   -29 04 09     1.452    2.175  124.3   22.2    51   11.6 
2025-10-21 00:00 UT   22 54 44.6   -29 03 17     1.458    2.172  123.4   22.5    52   11.6 
2025-10-22 00:00 UT   22 54 48.9   -29 02 06     1.465    2.169  122.6   22.8    52   11.6 
2025-10-23 00:00 UT   22 54 55.1   -29 00 35     1.472    2.167  121.7   23.0    53   11.6 
2025-10-24 00:00 UT   22 55 03.2   -28 58 46     1.478    2.164  120.8   23.3    53   11.7 
2025-10-25 00:00 UT   22 55 13.1   -28 56 39     1.485    2.161  120.0   23.5    54   11.7 
2025-10-26 00:00 UT   22 55 25.0   -28 54 13     1.492    2.159  119.1   23.7    54   11.7 
2025-10-27 00:00 UT   22 55 38.7   -28 51 30     1.500    2.156  118.2   24.0    55   11.7 
2025-10-28 00:00 UT   22 55 54.4   -28 48 29     1.507    2.153  117.4   24.2    55   11.7 
2025-10-29 00:00 UT   22 56 11.9   -28 45 11     1.514    2.151  116.6   24.4    55   11.7 
2025-10-30 00:00 UT   22 56 31.3   -28 41 36     1.522    2.148  115.7   24.6    56   11.7 
2025-10-31 00:00 UT   22 56 52.6   -28 37 44     1.529    2.145  114.9   24.8    56   11.8 
2025-11-01 00:00 UT   22 57 15.7   -28 33 37     1.537    2.143  114.1   25.0    56   11.8 
2025-11-02 00:00 UT   22 57 40.6   -28 29 13     1.544    2.140  113.3   25.2    57   11.8 
2025-11-03 00:00 UT   22 58 07.3   -28 24 33     1.552    2.138  112.5   25.4    57   11.8 
2025-11-04 00:00 UT   22 58 35.9   -28 19 39     1.560    2.135  111.7   25.6    58   11.8 
2025-11-05 00:00 UT   22 59 06.2   -28 14 29     1.567    2.133  110.9   25.7    58   11.8 
2025-11-06 00:00 UT   22 59 38.2   -28 09 04     1.575    2.130  110.1   25.9    58   11.8 
2025-11-07 00:00 UT   23 00 12.0   -28 03 25     1.583    2.128  109.3   26.1    59   11.9 
2025-11-08 00:00 UT   23 00 47.6   -27 57 31     1.591    2.125  108.6   26.2    59   11.9 
2025-11-09 00:00 UT   23 01 24.8   -27 51 23     1.599    2.123  107.8   26.4    59   11.9 


    Terminology:
            
    delta:  distance between minor planet and earth in AU
    radius: distance between minor planet 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-minor planet)    
    phase:  phase angle in degrees (angle sun-minor planet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km
    

Orbital elements provided by 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.