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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
sleep NighttimeWhat's Visible Now?
Dwarf Planets and Asteroids » 

Asteroid 11 Parthenope

Altitude: -45.9°   Azimuth: 295.5°   Direction: West-North-West

Asteroid 11 Parthenope is a large, main-belt asteroid with a diameter of approximately 162 kilometers. It was discovered on May 11, 1850, by Italian astronomer Annibale de Gasparis and named after the Siren of Greek mythology, Parthenope. The asteroid orbits the Sun between Mars and Jupiter, with a semi-major axis of approximately 2.45 astronomical units (AU) and an orbital period of about 4.04 years. Parthenope's orbit is relatively eccentric and inclined compared to other asteroids in the main belt. It rotates slowly, with a rotation period of about 16 hours. Parthenope is also classified as a C-type asteroid, indicating that its surface is likely rich in carbonaceous materials.

Asteroid 11 Parthenope is currently in the constellation of Sagittarius.

The current Right Ascension of Asteroid 11 Parthenope is 19h 29m 53s and the Declination is -22° 00’ 31” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom edit_location_alt). The current magnitude of Asteroid 11 Parthenope is 11.64 (JPL).

19h 29m 53s
-22° 00’ 31”

Today's rise, transit and set times of Asteroid 11 Parthenope from Greenwich, United Kingdom edit_location_alt (all times relative to the local timezone Europe/London):

Azimuth: 112.0°
Max altitude: 16.5°
Azimuth: 248.0°
  • 11 Parthenope is below the horizon from Greenwich, United Kingdom edit_location_alt.
  • Given its current magnitude, 11 Parthenope is visible with the help of a telescope having an aperture of 4 inches (100mm) or more.
  • 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.

Available Resources

Asteroid 11 Parthenope Position and Finder Charts

Below we provide Asteroid 11 Parthenope 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.

Finder chart of 11 Parthenope in Sagittarius on December,01 2023
Map showing Asteroid 11 Parthenope in Sagittarius on December, 01 2023
Field of view: 50x30 degrees
View fullscreen
Finder chart of 11 Parthenope
Map showing Asteroid 11 Parthenope in Sagittarius on December, 01 2023
Field of view: 10x6 degrees
View fullscreen

Higher precision deep sky finder chart, 60 arcmin wide, showing where Asteroid 11 Parthenope is right now. Click on the image to see a more detailed fullscreen tracker view.

11 Parthenope
RA: 19h 29m 53s
Dec: -22° 00’ 31”
Deep sky finder chart for Asteroid 11 Parthenope
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Asteroid 11 Parthenope?, a page that provides all the information needed to find Asteroid 11 Parthenope in the sky and additional links to sky charts.

Asteroid 11 Parthenope Distance from Earth

The distance of Asteroid 11 Parthenope from Earth is currently 424,479,223 kilometers, equivalent to 2.837468 Astronomical Units. Light takes 23 minutes and 35.9103 seconds to travel from Asteroid 11 Parthenope and arrive to us.

23 minutes and 35.9103 seconds

The following chart shows the distance of Asteroid 11 Parthenope 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.

Chart of the distance of Asteroid 11 Parthenope from Earth in Astronomical Units (au)

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 11 Parthenope from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach of Asteroid 11 Parthenope to Earth

Between 1 January 1900 and 31 December 2099, the closest approach of Asteroid 11 Parthenope to Earth happens on Mon Aug 11 2081 at a distance of 1.187050 Astronomical Units, or 177,580,172 kilometers:

Mon Aug 11 2081

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

Asteroid 11 Parthenope Brightness and Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 11 Parthenope, 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.

Chart of the magnitude of Asteroid 11 Parthenope as a function of time

Asteroid 11 Parthenope Orbital Elements

The following table lists the orbital elements of Asteroid 11 Parthenope at epoch 24 February 2023 00:00 UTC (JD: 2460000.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.09941749
Orbit inclination i 4.63133416°
Perihelion distance q 2.20919106 AU
330,490,279 km
Aphelion distance Q 2.69694697 AU
403,457,525 km
Semi-major axis a 2.45306902 AU
366,973,902 km
Orbital period period 3.8421 years
1,403.3406 days
Date of perihelion transit Tp 2024-Jan-11 04:26:02
2,460,320.6847 JD
Argument of perihelion peri 195.73724774726°
Longitude of the ascending node node 125.52086857436°
Mean anomaly M 277.86276820831°
Mean motion n 0.25653075°/day

Visualization of Asteroid 11 Parthenope Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid 11 Parthenope with respect of the Sun and the orbits of the major planets. The position of Asteroid 11 Parthenope 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 11 Parthenope
View Asteroid 11 Parthenope in the 3D Solar System Simulator

Asteroid 11 Parthenope Physical Data

The following shows the known values of the most important physical parameters of Asteroid 11 Parthenope. Source: JPL Small-Body Database

Physical Parameter Value Relative to Earth
Diameter 153.33 km 0.0120
Sideral Rotation 13.7204 hours 0.5732
Absolute Magnitude 6.55
Geometric Albedo 0.1803

Asteroid 11 Parthenope 15 Days Ephemeris

The following table lists the ephemerides of Asteroid 11 Parthenope computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Asteroid 11 Parthenope in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2023 Nov 24 19h 15m 11s -22° 21’ 06” 11.64 Sagittarius
2023 Nov 25 19h 17m 17s -22° 18’ 30” 11.64 Sagittarius
2023 Nov 26 19h 19m 23s -22° 15’ 47” 11.64 Sagittarius
2023 Nov 27 19h 21m 29s -22° 12’ 59” 11.64 Sagittarius
2023 Nov 28 19h 23m 35s -22° 10’ 01” 11.64 Sagittarius
2023 Nov 29 19h 25m 41s -22° 06’ 59” 11.64 Sagittarius
2023 Nov 30 19h 27m 47s -22° 03’ 47” 11.64 Sagittarius
2023 Dec 01 19h 29m 53s -22° 00’ 29” 11.64 Sagittarius
2023 Dec 02 19h 32m 00s -21° 57’ 06” 11.64 Sagittarius
2023 Dec 03 19h 34m 08s -21° 53’ 34” 11.64 Sagittarius
2023 Dec 04 19h 36m 15s -21° 49’ 54” 11.64 Sagittarius
2023 Dec 05 19h 38m 21s -21° 46’ 09” 11.64 Sagittarius
2023 Dec 06 19h 40m 30s -21° 42’ 16” 11.64 Sagittarius
2023 Dec 07 19h 42m 37s -21° 38’ 17” 11.64 Sagittarius