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Asteroid 17 Thetis

Asteroid 17 Thetis is currently in the constellation of Aquarius. The current Right Ascension of Asteroid 17 Thetis is 22h 59m 11s and the Declination is -13° 31’ 33” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current magnitude of Asteroid 17 Thetis is 11.74 (JPL).

Summary of key facts about Asteroid 17 Thetis [tip: you can also create a Quick Access page for this data if you access it frequently and would like to have a simpler view]:

22h 59m 11s
-13° 31’ 33”
  • 17 Thetis is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South-South-East direction at an altitude of 24° above the horizon.
  • Given its current magnitude, 17 Thetis is visible with the help of a telescope havng an aperture of 4 inches (100mm) or more.
  • See also 17 Thetis rise and set times.
  • Go to interactive sky chart

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Additional information about Asteroid 17 Thetis available on TheSkyLive:

Available Resources

Asteroid 17 Thetis Position and Finder Charts

Below we provide Asteroid 17 Thetis finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.

Map showing Asteroid 17 Thetis in Aquarius on October, 22 2020
Field of view: 50x30 degrees
View fullscreen
Map showing Asteroid 17 Thetis in Aquarius on October, 22 2020
Field of view: 10x6 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, 60 arcmin wide, showing where Asteroid 17 Thetis is right now. Click on the image to see a more detailed fullscreen tracker view.

17 Thetis
RA: 22h 59m 11s
Dec: -13° 31’ 33”
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 from Earth

The distance of Asteroid 17 Thetis from Earth is currently 254,198,281 kilometers, equivalent to 1.699211 Astronomical Units. Light takes 14 minutes and 7.9142 seconds to travel from Asteroid 17 Thetis and arrive to us.

14 minutes and 7.9142 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 1.139098 Astronomical Units, or 170,406,600 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 11.74.


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: 103.5°
Max altitude: 25.0°
Azimuth: 256.5°

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 30 May 2020 00:00 UTC (JD: 2459000.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.13332273
Orbit inclination i 5.59266223°
Perihelion distance q 2.14152894 AU
320,368,170 km
Aphelion distance Q 2.80040044 AU
418,933,944 km
Semi-major axis a 2.47096469 AU
369,651,057 km
Orbital period period 3.8800 years
1,418.7250 days
Date of perihelion transit Tp 2019-Dec-05 08:48:00
2,458,822.8667 JD
Next perihelion transit 2023-Oct-24 02:12
2,460,241.5917 JD
Argument of perihelion peri 135.97414788489°
Longitude of the ascending node node 125.5396700653°
Mean anomaly M 45.0742725087°
Mean motion n 0.25374896°/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 Oct 15 23h 00m 39s -13° 30’ 24” 11.54 Aquarius
2020 Oct 16 23h 00m 23s -13° 31’ 15” 11.57 Aquarius
2020 Oct 17 23h 00m 07s -13° 31’ 53” 11.59 Aquarius
2020 Oct 18 22h 59m 54s -13° 32’ 18” 11.62 Aquarius
2020 Oct 19 22h 59m 43s -13° 32’ 31” 11.65 Aquarius
2020 Oct 20 22h 59m 31s -13° 32’ 31” 11.67 Aquarius
2020 Oct 21 22h 59m 23s -13° 32’ 21” 11.69 Aquarius
2020 Oct 22 22h 59m 16s -13° 31’ 57” 11.72 Aquarius
2020 Oct 23 22h 59m 11s -13° 31’ 22” 11.74 Aquarius
2020 Oct 24 22h 59m 07s -13° 30’ 34” 11.77 Aquarius
2020 Oct 25 22h 59m 04s -13° 29’ 35” 11.79 Aquarius
2020 Oct 26 22h 59m 03s -13° 28’ 26” 11.82 Aquarius
2020 Oct 27 22h 59m 04s -13° 27’ 05” 11.84 Aquarius
2020 Oct 28 22h 59m 08s -13° 25’ 32” 11.86 Aquarius