Hidalgo
944 Hidalgo (A920 UB)
Where is it now
- Distance from Sun
- 9.37 AU
- True anomaly
- 187.37°
- As of
- 17 September 2026
Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.
In the sky
- Right ascension
- 15h 57m 32s
- Declination
- -58° 03′ 06″
- Constellation
- Norma
- Distance from Earth
- 9.53 AU
- Elongation from the Sun
- 77.85° — well clear of the Sun
Favours the southern hemisphere; low or below the horizon from far north.
From your location
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Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.
Orbital elements
- Semi-major axis
- 5.729 AU
- Eccentricity
- 0.6621
- Inclination
- 42.52°
- Orbital period
- 13.71 years
- Perihelion
- 1.936 AU
- Aphelion
- 9.522 AU
- Longitude of ascending node
- 21.33°
- Argument of periapsis
- 56.63°
- Epoch · J2000
- 2461200.5
- Orbit class · CEN
- Centaur
- Earth MOID · 443.0 LD
- 1.1383 AU
- Tisserand (Jupiter)
- 2.067
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 2,657
- Data arc
- 103.5 years
- First observed
- 31 October 1920
- Last observed
- 12 May 2024
- Residual RMS
- 0.44 ″
- Solution · Otto Matic
- 11 March 2026
Physical properties
- Mean radius
- 19 km
- Rotation period
- 10.06 hours
Visual & observation
- Geometric albedo
- 0.06
- Absolute magnitude (H)
- 10.55
- Colour index (B–V)
- 0.74
- Spectral type (Tholen)
- D
- Colour index (U–B)
- 0.26
Discovery & classification
- Discovered by
- Baade, W.
- Discovery date
- 31 October 1920
- Discovery site
- Bergedorf
Also known as 944 · 1920 HZ · A920 UB
Sources
- orbital elements: JPL SBDB