(71) Niobe
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	15 Sep 2025	12.1	2.475 AU	2.222 AU	17h32m	-35°39'	92.3°	24.0°
Opposition	25 Sep 2026	11.9	3.098 AU	2.161 AU	23h25m	+23°51'	154.8°	7.9°

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 Niobe are:

            e (Eccentricity)                : 0.1769568
            a (Semimajor axis)              : 2.7546232
            i (Inclination)                 : 23.24272
            Ω (Longitude of ascending node) : 315.90887
            ω (Argument of perihelion)      : 267.05076
            M (Mean anomaly)                : 18.04959
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 42.69965
            B (Latitude of perihelion)      : -23.21013
            P (Orbital period in years)     : 4.57            
        

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
2025-09-15 00:00 UT   17 32 55.2   -35 39 18     2.222    2.475   92.3   24.0    92   12.1 
2025-09-15 03:19 UT   17 33 06.3   -35 37 59     2.224    2.475   92.2   24.0    92   12.1 
2025-09-16 00:00 UT   17 34 15.9   -35 29 45     2.236    2.477   91.6   23.9    92   12.1 
2025-09-17 00:00 UT   17 35 37.4   -35 20 17     2.250    2.479   90.9   23.9    92   12.1 
2025-09-18 00:00 UT   17 36 59.6   -35 10 54     2.264    2.480   90.2   23.9    92   12.1 
2025-09-19 00:00 UT   17 38 22.5   -35 01 35     2.278    2.482   89.5   23.9    92   12.1 
2025-09-20 00:00 UT   17 39 46.1   -34 52 20     2.292    2.484   88.8   23.8    92   12.1 
2025-09-21 00:00 UT   17 41 10.4   -34 43 09     2.306    2.485   88.2   23.8    92   12.1 
2025-09-22 00:00 UT   17 42 35.3   -34 34 02     2.320    2.487   87.5   23.8    92   12.2 
2025-09-23 00:00 UT   17 44 00.9   -34 24 59     2.334    2.489   86.8   23.7    92   12.2 
2025-09-24 00:00 UT   17 45 27.1   -34 15 59     2.348    2.490   86.2   23.7    92   12.2 
2025-09-25 00:00 UT   17 46 54.0   -34 07 04     2.362    2.492   85.5   23.7    92   12.2 
2025-09-26 00:00 UT   17 48 21.4   -33 58 11     2.376    2.494   84.8   23.6    92   12.2 
2025-09-27 00:00 UT   17 49 49.4   -33 49 22     2.390    2.496   84.2   23.6    92   12.2 
2025-09-28 00:00 UT   17 51 17.9   -33 40 36     2.404    2.497   83.5   23.5    92   12.2 
2025-09-29 00:00 UT   17 52 47.0   -33 31 53     2.418    2.499   82.8   23.4    92   12.3 
2025-09-30 00:00 UT   17 54 16.7   -33 23 13     2.432    2.501   82.2   23.4    92   12.3 
2025-10-01 00:00 UT   17 55 46.8   -33 14 36     2.446    2.502   81.5   23.3    92   12.3 
2025-10-02 00:00 UT   17 57 17.4   -33 06 01     2.460    2.504   80.9   23.2    92   12.3 
2025-10-03 00:00 UT   17 58 48.6   -32 57 29     2.474    2.506   80.2   23.2    92   12.3 
2025-10-04 00:00 UT   18 00 20.1   -32 48 59     2.488    2.508   79.5   23.1    92   12.3 
2025-10-05 00:00 UT   18 01 52.2   -32 40 32     2.502    2.509   78.9   23.0    92   12.3 
2025-10-06 00:00 UT   18 03 24.7   -32 32 06     2.516    2.511   78.2   22.9    92   12.3 
2025-10-07 00:00 UT   18 04 57.5   -32 23 43     2.530    2.513   77.6   22.9    91   12.3 
2025-10-08 00:00 UT   18 06 30.8   -32 15 21     2.544    2.515   76.9   22.8    91   12.4 
2025-10-09 00:00 UT   18 08 04.6   -32 07 02     2.558    2.516   76.3   22.7    91   12.4 
2025-10-10 00:00 UT   18 09 38.6   -31 58 43     2.572    2.518   75.6   22.6    91   12.4 

    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.