2015 HU171
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	21 Sep 2026	28.4	2.766 AU	2.086 AU	03h33m	+14°12'	123.1°	17.7°

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 2015 HU171 are:

            e (Eccentricity)                : 0.5814470
            a (Semimajor axis)              : 2.3070525
            i (Inclination)                 : 5.61630
            Ω (Longitude of ascending node) : 76.83911
            ω (Argument of perihelion)      : 179.36893
            M (Mean anomaly)                : 49.44678
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 76.21107
            B (Latitude of perihelion)      : 0.06176
            P (Orbital period in years)     : 3.50            
        

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
2026-09-21 00:00 UT   03 33 08.5   +14 12 50     2.086    2.766  123.1   17.7   259   28.4 
2026-09-21 16:56 UT   03 32 50.3   +14 11 22     2.082    2.770  123.9   17.5   259   28.4 
2026-09-22 00:00 UT   03 32 42.5   +14 10 44     2.080    2.771  124.2   17.4   259   28.4 
2026-09-23 00:00 UT   03 32 14.7   +14 08 33     2.073    2.776  125.3   17.2   260   28.4 
2026-09-24 00:00 UT   03 31 45.2   +14 06 16     2.066    2.781  126.4   16.9   260   28.4 
2026-09-25 00:00 UT   03 31 14.1   +14 03 54     2.060    2.786  127.5   16.6   260   28.4 
2026-09-26 00:00 UT   03 30 41.2   +14 01 27     2.054    2.792  128.6   16.3   260   28.4 
2026-09-27 00:00 UT   03 30 06.7   +13 58 56     2.048    2.797  129.7   16.0   260   28.4 
2026-09-28 00:00 UT   03 29 30.6   +13 56 19     2.042    2.802  130.8   15.7   260   28.3 
2026-09-29 00:00 UT   03 28 52.7   +13 53 37     2.036    2.807  132.0   15.4   260   28.3 
2026-09-30 00:00 UT   03 28 13.3   +13 50 50     2.030    2.812  133.1   15.1   260   28.3 
2026-10-01 00:00 UT   03 27 32.2   +13 47 59     2.025    2.817  134.3   14.8   261   28.3 
2026-10-02 00:00 UT   03 26 49.6   +13 45 03     2.020    2.822  135.4   14.4   261   28.3 
2026-10-03 00:00 UT   03 26 05.3   +13 42 02     2.015    2.827  136.6   14.1   261   28.3 
2026-10-04 00:00 UT   03 25 19.6   +13 38 56     2.010    2.832  137.7   13.7   261   28.3 
2026-10-05 00:00 UT   03 24 32.2   +13 35 46     2.005    2.836  138.9   13.4   261   28.3 
2026-10-06 00:00 UT   03 23 43.4   +13 32 31     2.001    2.841  140.1   13.0   261   28.2 
2026-10-07 00:00 UT   03 22 53.1   +13 29 12     1.997    2.846  141.3   12.7   261   28.2 
2026-10-08 00:00 UT   03 22 01.4   +13 25 49     1.993    2.851  142.5   12.3   262   28.2 
2026-10-09 00:00 UT   03 21 08.3   +13 22 22     1.989    2.856  143.7   12.0   262   28.2 
2026-10-10 00:00 UT   03 20 13.8   +13 18 51     1.986    2.861  144.9   11.6   262   28.2 
2026-10-11 00:00 UT   03 19 18.0   +13 15 16     1.982    2.866  146.1   11.2   262   28.2 
2026-10-12 00:00 UT   03 18 20.9   +13 11 37     1.979    2.871  147.3   10.8   263   28.2 
2026-10-13 00:00 UT   03 17 22.6   +13 07 55     1.977    2.875  148.5   10.4   263   28.1 
2026-10-14 00:00 UT   03 16 23.1   +13 04 09     1.974    2.880  149.7   10.1   263   28.1 
2026-10-15 00:00 UT   03 15 22.5   +13 00 21     1.972    2.885  151.0    9.7   264   28.1 
2026-10-16 00:00 UT   03 14 20.8   +12 56 29     1.970    2.890  152.2    9.3   264   28.1 
2026-10-17 00:00 UT   03 13 18.0   +12 52 35     1.968    2.894  153.4    8.9   264   28.1 
2026-10-18 00:00 UT   03 12 14.3   +12 48 38     1.967    2.899  154.7    8.5   265   28.1 
2026-10-19 00:00 UT   03 11 09.7   +12 44 39     1.966    2.904  155.9    8.1   265   28.0 
2026-10-20 00:00 UT   03 10 04.2   +12 40 38     1.965    2.908  157.1    7.6   266   28.0 
2026-10-21 00:00 UT   03 08 58.0   +12 36 34     1.964    2.913  158.4    7.2   267   28.0 

    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.