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Asteroid 17 Thetis

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Asteroid 17 Thetis Position

Asteroid 17 Thetis is currently in the constellation of Capricornus. The current Right Ascension is 20h 12m 22s and the Declination is -18° 39’ 40”.

20h 12m 22s
-18° 39’ 40”

Simplified sky chart showing where Asteroid 17 Thetis is right now in the sky with respect to the brightest stars and constellations (see full screen Online Planetarium)

Map showing Asteroid 17 Thetis in Capricornus on February, 21 2020
Field of view: 60x30 degrees
View fullscreen
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Higher precision deep sky finder chart showing where Asteroid 17 Thetis is right now (view fullscreen)

17 Thetis
RA: 20h 12m 22s
Dec: -18° 39’ 40”
Deep sky finder chart for Asteroid 17 Thetis
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Asteroid 17 Thetis?, a page that provides all the information needed to find Asteroid 17 Thetis in the sky and additional links to sky charts.

Asteroid 17 Thetis Distance

The distance of Asteroid 17 Thetis from Earth is currently 441,955,126 kilometers, equivalent to 2.954288 Astronomical Units. Light takes 24 minutes and 34.2036 seconds to travel from Asteroid 17 Thetis and arrive to us.

24 minutes and 34.2036 seconds

The following chart shows the distance of Asteroid 17 Thetis from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Distance of Asteroid 17 Thetis from Earth between January 2013 and December 2100

The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of 17 Thetis from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Asteroid 17 Thetis to Earth

Between January 2013 and December 2100 the closest approach of Asteroid 17 Thetis to Earth happens on Sun Jun 10 2035 at a distance of 1.13909773 Astronomical Units, or 170,406,595 kilometers:

Sun Jun 10 2035

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Asteroid 17 Thetis brightness

The current visual magnitude of Asteroid 17 Thetis is 12.52.


The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 17 Thetis, according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Predicted magnitude of Asteroid 17 Thetis between January 2013 and December 2100

Asteroid 17 Thetis rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Asteroid 17 Thetis rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 108.7°
Max altitude: 19.8°
Azimuth: 251.3°
Asteroid 17 Thetis is above the horizon from Greenwich, United Kingdom

The rise and set times are defined as the time at which the upper limb of Asteroid 17 Thetis touches the horizon, considering the effect of the atmospheric refraction. As the atmospheric conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Asteroid 17 Thetis Orbital Elements

The following table lists the orbital elements of Asteroid 17 Thetis at epoch 26 April 2019 00:00 UTC (JD: 2458600.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.13303159
Orbit inclination i 5.59120500°
Perihelion distance q 2.14171894 AU
320,396,594 km
Aphelion distance Q 2.79898923 AU
418,722,829 km
Semi-major axis a 2.47035409 AU
369,559,712 km
Orbital period period 3.8800 years
1,418.1992 days
Date of perihelion transit Tp 2019-Dec-06 02:42:27
2,458,823.6128 JD
Next perihelion transit 2023-Oct-24 07:29
2,460,241.8120 JD
Argument of perihelion peri 136.2082500236°
Longitude of the ascending node node 125.5529454583°
Mean anomaly M 303.36436328857°
Mean motion n 0.25384304°/day

Visualization of Asteroid 17 Thetis Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid 17 Thetis with respect of the Sun and the orbits of the major planets. The position of Asteroid 17 Thetis and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback!

Orbit Diagram of Asteroid 17 Thetis
View Asteroid 17 Thetis in the 3D Solar System Simulator

Asteroid 17 Thetis Physical Data

The following shows the known values of the most important physical parameters of Asteroid 17 Thetis. Source: JPL Small-Body Database

Physical Parameter Value Relative to Earth
Diameter 90.04 km 0.0071
Sideral Rotation 12.2705 hours 0.5127
Absolute Magnitude 7.76
Geometric Albedo 0.1715

Asteroid 17 Thetis 15 Days Ephemeris

The following table lists the ephemerides of Asteroid 17 Thetis computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Asteroid 17 Thetis in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2020 Feb 14 19h 55m 45s -19° 19’ 59” 12.48 Sagittarius
2020 Feb 15 19h 57m 57s -19° 14’ 58” 12.49 Sagittarius
2020 Feb 16 20h 00m 10s -19° 09’ 51” 12.49 Sagittarius
2020 Feb 17 20h 02m 21s -19° 04’ 41” 12.50 Sagittarius
2020 Feb 18 20h 04m 32s -18° 59’ 23” 12.50 Sagittarius
2020 Feb 19 20h 06m 43s -18° 54’ 02” 12.51 Sagittarius
2020 Feb 20 20h 08m 53s -18° 48’ 33” 12.51 Capricornus
2020 Feb 21 20h 11m 04s -18° 43’ 01” 12.51 Capricornus
2020 Feb 22 20h 13m 14s -18° 37’ 23” 12.52 Capricornus
2020 Feb 23 20h 15m 24s -18° 31’ 41” 12.52 Capricornus
2020 Feb 24 20h 17m 33s -18° 25’ 54” 12.52 Capricornus
2020 Feb 25 20h 19m 41s -18° 20’ 02” 12.53 Capricornus
2020 Feb 26 20h 21m 50s -18° 14’ 04” 12.53 Capricornus
2020 Feb 27 20h 23m 57s -18° 08’ 03” 12.53 Capricornus