(747) Winchester
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	2 Sep 2025	11.0	2.318 AU	1.335 AU	23h17m	-23°10'	162.8°	7.4°
Today	1 Nov 2025	11.8	2.143 AU	1.537 AU	22h57m	-28°33'	114.1°	25.0°

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.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-11-01 00:00 UT   22 57 15.7   -28 33 37     1.537    2.143  114.1   25.0    56   11.8 
2025-11-01 20:26 UT   22 57 36.8   -28 29 53     1.543    2.141  113.4   25.2    57   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 
2025-11-10 00:00 UT   23 02 03.7   -27 45 02     1.607    2.120  107.0   26.5    59   11.9 
2025-11-11 00:00 UT   23 02 44.3   -27 38 27     1.615    2.118  106.3   26.7    60   11.9 
2025-11-12 00:00 UT   23 03 26.5   -27 31 38     1.624    2.116  105.5   26.8    60   11.9 
2025-11-13 00:00 UT   23 04 10.4   -27 24 36     1.632    2.113  104.8   26.9    60   11.9 
2025-11-14 00:00 UT   23 04 55.9   -27 17 21     1.640    2.111  104.0   27.0    61   11.9 
2025-11-15 00:00 UT   23 05 42.9   -27 09 54     1.648    2.109  103.3   27.2    61   12.0 
2025-11-16 00:00 UT   23 06 31.6   -27 02 14     1.657    2.106  102.6   27.3    61   12.0 
2025-11-17 00:00 UT   23 07 21.8   -26 54 21     1.665    2.104  101.9   27.4    61   12.0 
2025-11-18 00:00 UT   23 08 13.5   -26 46 16     1.673    2.102  101.2   27.5    62   12.0 
2025-11-19 00:00 UT   23 09 06.7   -26 37 60     1.682    2.099  100.4   27.6    62   12.0 
2025-11-20 00:00 UT   23 10 01.5   -26 29 31     1.690    2.097   99.7   27.7    62   12.0 
2025-11-21 00:00 UT   23 10 57.7   -26 20 52     1.699    2.095   99.0   27.8    62   12.0 
2025-11-22 00:00 UT   23 11 55.3   -26 12 00     1.707    2.093   98.3   27.8    63   12.0 
2025-11-23 00:00 UT   23 12 54.4   -26 02 58     1.716    2.091   97.7   27.9    63   12.0 
2025-11-24 00:00 UT   23 13 54.9   -25 53 45     1.724    2.088   97.0   28.0    63   12.1 
2025-11-25 00:00 UT   23 14 56.7   -25 44 21     1.733    2.086   96.3   28.1    63   12.1 
2025-11-26 00:00 UT   23 15 59.9   -25 34 47     1.741    2.084   95.6   28.1    64   12.1 
2025-11-27 00:00 UT   23 17 04.4   -25 25 03     1.750    2.082   95.0   28.2    64   12.1 
2025-11-28 00:00 UT   23 18 10.3   -25 15 08     1.758    2.080   94.3   28.2    64   12.1 
2025-11-29 00:00 UT   23 19 17.4   -25 05 04     1.767    2.078   93.6   28.3    64   12.1 
2025-11-30 00:00 UT   23 20 25.8   -24 54 50     1.776    2.076   93.0   28.3    65   12.1 
2025-12-01 00:00 UT   23 21 35.3   -24 44 26     1.784    2.074   92.3   28.4    65   12.1 

    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.