Astronomy Picture of the Day ·

Mystery Object Explained

The Astronomy Picture of the Day for September 28, 1999 is “Mystery Object Explained,” an image. It is credited to Credit: S. G. Djorgovski et al., DPOSS Team, Palomar Observatory. The original explanation runs about 123 words.

Mystery Object Explained
Credit: S. G. Djorgovski et al., DPOSS Team, Palomar Observatory Shown from science.nasa.gov. Not hosted by OpenOrbit.

From the explanation

“Explorers often discover the unexpected . Such was the case when the Second Palomar Observatory Sky Survey chanced upon the unusual object circled in the above photograph .”

— APOD editors, September 28, 1999

Read the full explanation on science.nasa.gov

At a glance

Date
September 28, 1999
Type
Image
Credit
Credit: S. G. Djorgovski et al., DPOSS Team, Palomar Observatory
Copyright
No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length
About 123 words

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On this day: September 28 in other years

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Source

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.