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HST

NORAD 20580 Class: Unclassified Int'l: 90037B First seen: 2026-11-10 1 epoch

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Live Telemetry

Latitude —

Longitude —

Altitude —

Velocity —

Orbital Period —

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Observer Latitude (°)

Observer Longitude (°)

Min Elevation Mask

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📖 TLE Field Reference — click to expand

Epoch (UTC) The UTC date and time at which the orbital elements were determined. Elements are most accurate near this epoch.

Inclination (°) The angle between the orbital plane and Earth's equatorial plane. 0° = equatorial orbit, 90° = polar orbit.

RAAN (°) Right Ascension of the Ascending Node — the angle from the vernal equinox to the point where the satellite crosses the equator heading north.

Eccentricity Describes the shape of the orbit. 0 = perfectly circular, closer to 1 = highly elliptical. Most LEO satellites are < 0.01.

Arg. of Perigee (°) The angle from the ascending node to the orbital point closest to Earth (perigee), measured in the orbital plane.

Mean Anomaly (°) Fraction of the orbit completed since last perigee passage, expressed as an angle. Used with other elements to predict satellite position.

Mean Motion (rev/day) Number of complete revolutions the satellite makes per day. ISS ≈ 15.5 rev/day. Higher = lower orbit.

BSTAR Drag Atmospheric drag coefficient proxy used by the SGP4 propagator. Higher values indicate more atmospheric drag (lower orbit or higher solar activity).

Mean Motion Dot First time derivative of mean motion (rev/day²). Positive value indicates the orbit is decaying due to drag.

Element Set # Sequential counter incremented each time a new TLE is generated for this satellite. Higher = more recent.

Rev. Number The cumulative revolution count at the epoch. Increments by 1 with each complete orbit.

Int'l Designator COSPAR ID: 2-digit launch year + 3-digit launch number + piece code. E.g. 98067A = launched 1998, 67th launch, piece A.

Epoch (UTC)	Incl. (°)	RAAN (°)	Eccentricity	Arg. Perigee (°)	Mean Anomaly (°)	Mean Motion (rev/day)	BSTAR Drag	Ṁ Dot	Rev #	Set #	Raw TLE
2008-09-20 12:25	28.4694	80.0000	0.0002949	45.0000	315.0000	15.09000000	0.00000e+00	0.00000000	0	999

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