(201) Penelope
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	25 Jun 2025	13.9	2.763 AU	3.773 AU	05h58m	+19°30'	5.4°	2.0°
Opposition	28 Jan 2026	12.8	3.072 AU	2.089 AU	08h39m	+14°12'	175.9°	1.3°

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 Penelope are:

            e (Eccentricity)                : 0.1794358
            a (Semimajor axis)              : 2.6803136
            i (Inclination)                 : 5.75565
            Ω (Longitude of ascending node) : 156.86887
            ω (Argument of perihelion)      : 181.33806
            M (Mean anomaly)                : 78.29807
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 158.20019
            B (Latitude of perihelion)      : -0.13418
            P (Orbital period in years)     : 4.39            
        

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
2025-06-25 00:00 UT   05 58 18.3   +19 30 47     3.773    2.763    5.4    2.0   224   13.9 
2025-06-25 04:22 UT   05 58 37.2   +19 30 51     3.773    2.763    5.5    2.0   224   13.9 
2025-06-26 00:00 UT   06 00 02.1   +19 31 04     3.774    2.765    5.8    2.1   228   13.9 
2025-06-27 00:00 UT   06 01 45.8   +19 31 16     3.775    2.766    6.2    2.3   231   13.9 
2025-06-28 00:00 UT   06 03 29.4   +19 31 23     3.775    2.768    6.7    2.4   235   13.9 
2025-06-29 00:00 UT   06 05 12.9   +19 31 25     3.776    2.770    7.1    2.6   237   13.9 
2025-06-30 00:00 UT   06 06 56.2   +19 31 22     3.776    2.772    7.6    2.8   240   14.0 
2025-07-01 00:00 UT   06 08 39.3   +19 31 15     3.777    2.774    8.0    2.9   242   14.0 
2025-07-02 00:00 UT   06 10 22.4   +19 31 04     3.777    2.775    8.5    3.1   244   14.0 
2025-07-03 00:00 UT   06 12 05.2   +19 30 47     3.777    2.777    9.0    3.3   246   14.0 
2025-07-04 00:00 UT   06 13 47.9   +19 30 27     3.777    2.779    9.5    3.5   247   14.0 
2025-07-05 00:00 UT   06 15 30.5   +19 30 01     3.776    2.781   10.0    3.6   249   14.0 
2025-07-06 00:00 UT   06 17 12.8   +19 29 31     3.776    2.783   10.5    3.8   250   14.0 
2025-07-07 00:00 UT   06 18 55.1   +19 28 57     3.775    2.784   11.0    4.0   252   14.0 
2025-07-08 00:00 UT   06 20 37.1   +19 28 18     3.775    2.786   11.5    4.2   253   14.1 
2025-07-09 00:00 UT   06 22 18.9   +19 27 35     3.774    2.788   12.1    4.4   254   14.1 
2025-07-10 00:00 UT   06 24 00.6   +19 26 47     3.773    2.790   12.6    4.6   255   14.1 
2025-07-11 00:00 UT   06 25 42.1   +19 25 55     3.772    2.791   13.1    4.7   256   14.1 
2025-07-12 00:00 UT   06 27 23.4   +19 24 58     3.771    2.793   13.6    4.9   257   14.1 
2025-07-13 00:00 UT   06 29 04.5   +19 23 57     3.769    2.795   14.2    5.1   257   14.1 
2025-07-14 00:00 UT   06 30 45.4   +19 22 52     3.768    2.797   14.7    5.3   258   14.1 
2025-07-15 00:00 UT   06 32 26.1   +19 21 42     3.766    2.798   15.2    5.5   259   14.1 
2025-07-16 00:00 UT   06 34 06.7   +19 20 29     3.764    2.800   15.8    5.7   260   14.1 

    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.