© NASA/Galileo 1993. Pictured asteroid is 243 Ida.

Asteroid 349 Dembowska at opposition

Dominic Ford, Editor
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The sky at

Asteroid 349 Dembowska will be well placed, lying in the constellation Taurus, well above the horizon for much of the night.

Regardless of your location on the Earth, 349 Dembowska will reach its highest point in the sky around midnight local time.

From Washington, it will be visible between 18:45 and 05:54. It will become accessible at around 18:45, when it rises to an altitude of 21° above your eastern horizon. It will reach its highest point in the sky at 00:20, 82° above your southern horizon. It will become inaccessible at around 05:54 when it sinks below 21° above your western horizon.

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The geometry of the alignment

This optimal positioning occurs when it makes its closest approach to the point in the sky directly opposite to the Sun – an event termed opposition. Since the Sun reaches its greatest distance below the horizon at midnight, the point opposite to it is highest in the sky at the same time.

At around the same time that 349 Dembowska passes opposition, it also makes its closest approach to the Earth – termed its perigee – making it appear at its brightest in the night sky. This happens because when 349 Dembowska lies opposite to the Sun in the night sky, the solar system is lined up so that 349 Dembowska, the Earth and the Sun lie in a straight line with the Earth in the middle, on the same side of the Sun as 349 Dembowska.

On this occasion, 349 Dembowska will pass within 1.774 AU of us, reaching a peak brightness of magnitude 9.8. Nonetheless, even at its brightest, 349 Dembowska is a faint object beyond the reach of the naked eye; binoculars or a telescope of moderate aperture are needed.

Finding 349 Dembowska

The chart below indicates the path of 349 Dembowska across the sky around the time of opposition.

It was produced using StarCharter and is available for download, either on dark background, in PNG, PDF or SVG formats, or on a light background, in PNG, PDF or SVG formats.

The position of 349 Dembowska at the moment of opposition will be as follows:

Object Right Ascension Declination Constellation Magnitude
Asteroid 349 Dembowska 04h27m10s 29°40'N Taurus 9.8

The coordinates above are given in J2000.0.

The sky on 29 Mar 2024

The sky on 29 March 2024
Sunrise
07:21
Sunset
19:53
Twilight ends
21:22
Twilight begins
05:52

19-day old moon
Waning Gibbous

81%

19 days old

Planets
Rise Culm. Set
Mercury 07:52 14:35 21:19
Venus 06:46 12:35 18:24
Moon 23:29 04:30 09:25
Mars 06:02 11:32 17:02
Jupiter 09:06 16:00 22:53
Saturn 06:25 12:03 17:41
All times shown in MDT.

Source

The circumstances of this event were computed from orbital elements made available by Ted Bowell of the Lowell Observatory. The conversion to geocentric coordinates was performed using the position of the Earth recorded in the DE430 ephemeris published by the Jet Propulsion Laboratory (JPL).

The star chart above shows the positions and magnitudes of stars as they appear in the Tycho catalogue. The data was reduced by the author and plotted using PyXPlot. A gnomonic projection of the sky has been used; celestial coordinates are indicated in the J2000.0 coordinate system.

Image credit

© NASA/Galileo 1993. Pictured asteroid is 243 Ida.

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Washington

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Longitude:
Timezone:

37.13°N
113.51°W
MDT

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