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The Brighter Asteroids in 2009:    (1) Ceres


Charts showing the path of Ceres during 2009. Ceres is too close to the Sun for observation from late September to almost the end of the year.

Late 2008 to mid 2009      June and July 2009      August and September 2009

Positions of Ceres in 2009          Other Asteroids

Ceres will be at opposition on 25 February 2009 when it will be at its brightest, magnitude 6.9. Due to the inclination of its orbit, it will not be due north at local midnight until a few days later on 2 March 2009. The asteroid is at conjunction with the Sun on 31 October 2009, and too close to the Sun for observation about a month or more either side of this date.

On 17 January 2009, Ceres reaches a stationary point in Leo. In the days that follow, Ceres will start moving in a retrograde sense to the west leading up to its opposition. It reaches a second stationary point 3 months later on 17 April when the westerly movement of Ceres will cease and it will recommence moving in a forward direction to the east.

At the end of October, Ceres is at conjunction with the Sun. As a result the minor planet will not be observable from late September when it will set shortly after the Sun in the evening. After conjunction Ceres will rise in the morning sky before the Sun, but will remain lost in the morning twilight until the very end of December.

At opposition, Ceres will be well north of the equator and so low in the sky for southern hemisphere observers. By the end of March the minor planet will be moving to the south and so get higher in southern skies during the rest of the year. It crosses the celestial equator into the southern hemisphere early in September.

As its number implies, Ceres was the first Minor Planet or Asteroid to be discovered. It was discovered by G Piazzi at Palermo in Sicily being first seen by him on 1 January 1801.

Ceres has a diameter of 932.6 km and is easily the largest inner asteroid, although recently a number of larger Kuiper belt objects have been discovered. At its 2006 meeting in Prague, the IAU voted that Ceres should be one of the group of "Dwarf Planets". It is the only asteroid that is large enough to be pulled into a spherical shape by its gravity.

Ceres's orbital period is 4.60 years, its distance from the Sun varying between 2.55 and 2.98 AU. The orbit is inclined at 10.6° to the ecliptic.

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Chart showing the path of Ceres at the end of 2008 and the first half of 2009.

The chart shows the path of Ceres through Leo and Leo Minor from mid October 2008 through the first half of 2009. During this time it will follow its retrograde loop with opposition on 2 March 2009. Ceres is marked on the path at its position on 30 November 2008.

The chart is a southern hemisphere view with north at the bottom and east to the right. Stars to magnitude 9.0 are shown, which is about the limiting magnitude of 50 mm aperture binoculars. Magnitudes are marked (without a decimal point) for stars brighter than 6.5.

The circle on the chart represents a field of view 5° in diameter, a fairly typical field of view for binoculars.

Ceres in the first half of


Chart showing the path of Ceres from mid June to mid August 2009.

The chart shows the path of through Leo and Virgo from mid June to early August 2009. Ceres is marked on the path at its position on 18 June 2009.

The chart is a southern hemisphere view with north at the bottom and east to the right. Stars to magnitude 9.0 are shown, which is about the limiting magnitude of 50 mm aperture binoculars. Magnitudes are marked (without a decimal point) for stars brighter than 6.5.

The circle on the chart represents a field of view 5° in diameter, a fairly typical field of view for binoculars.

Path of Ceres during June and July 2009


Chart showing the path of Ceres during August and September 2009.

The chart shows the path of through Leo and Virgo from early August to late September 2009. During this time the minor planet will be moving across Virgp. Ceres is marked on the path at its position on 7 August 2009.

The chart is a southern hemisphere view with north at the bottom and east to the right. Stars to magnitude 9.0 are shown, which is about the limiting magnitude of 50 mm aperture binoculars. Magnitudes are marked (without a decimal point) for stars brighter than 6.5.

The circle on the chart represents a field of view 5° in diameter, a fairly typical field of view for binoculars.

Path of Ceres during August and September 2009


Positional data for Ceres during 2009.


Date
2008
R.A
hr min
Dec
 °  '
 Mag   Const
Nov 27 10 49.2 +17 26 8.4 Leo
Dec 7 10 59.6 +17 18 8.3 Leo
Dec 17 11 08.4 +17 23 8.1 Leo
Dec 27 11 15.1 +17 45 7.9 Leo
Date
2009
R.A
hr min
Dec
 °  '
 Mag   Const
Jan 6 11 19.4 +18 24 7.8 Leo
Jan 16 11 21.2 +19 20 7.6 Leo
Jan 26 11 20.1 +20 31 7.4 Leo
Feb 5 11 16.2 +21 50 7.1 Leo
Feb 15 11 09.8 +23 11 7.0 Leo
Feb 25 11 01.7 +24 24 6.9 Leo
Mar 7 10 52.9 +25 18 7.0 Leo Minor
Mar 17 10 44.6 +25 49 7.1 Leo Minor
Mar 27 10 37.9 +25 54 7.4 Leo Minor
Apr 6 10 33.6 +25 34 7.6 Leo
Apr 16 10 32.0 +24 54 7.8 Leo
Apr 26 10 33.0 +23 56 7.9 Leo
May 6 10 36.5 +22 44 8.1 Leo
May 16 10 42.2 +21 22 8.2 Leo
May 26 10 49.7 +19 51 8.4 Leo
Jun 5 10 58.8 +18 14 8.5 Leo
Jun 15 11 09.1 +16 31 8.6 Leo
Jun 25 11 20.5 +14 43 8.7 Leo
Jul 5 11 32.7 +12 52 8.7 Leo
Jul 15 11 45.5 +10 58 8.8 Leo
Jul 25 11 59.0 +09 02 8.8 Virgo
Aug 4 12 13.0 +07 05 8.8 Virgo
Aug 14 12 27.3 +05 07 8.9 Virgo
Aug 24 12 42.1 +03 09 8.9 Virgo
Sep 3 12 57.2 +01 11 8.8 Virgo
Sep 13 13 12.6 -00 44 8.8 Virgo
Sep 23 13 28.2 -02 38 8.8 Virgo
Oct 3 13 44.1 -04 28 8.7 Virgo
Date
2009
R.A
hr min
Dec
 °  '
 Mag   Const
Dec 2 15 23.6 -13 54 8.8 Libra
Dec 12 15 40.4 -15 06 8.9 Libra
Dec 22 15 57.2 -16 11 8.9 Libra
Jan 1 16 13.7 -17 09 9.0 Scorpius

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