Sky & Telescope - January 2025 - 25

HBH 9
Simeis 288
LDN 1477
BORDER GUARDS This fantastic image captured by Przemysław Za¸ bczyk shows Capella at the leftmost edge along with two large nebulae of
roughly equal size. The one at left is the supernova remnant HBH 9, which resides completely in Auriga, while the nebula on the right is the planetary
nebula Simeis 288, which instead is fully in Perseus. But what you can't easily tell is that HBH 9 is more than five times farther away than Simeis 288.
In 1953, Robert Hanbury Brown and Cyril Hazard (both
at Jodrell Bank Observatory, England) published a list of 23
" localized " radio sources for which they'd determined fairly
accurate coordinates. Many of the positions agreed closely
with known radio sources, but a few bright ones had no obvious
optical counterparts. The following year, with the help
of Rudolph Minkowski (Palomar Observatory), Brown and
Hazard matched their source #9 with a large nebula almost
3° west of Capella that consisted of " faint filaments. " Their
discovery was only the fifth nebula in the Milky Way to be
identified with a radio source.
Later in the 1950s, Sharpless included HBH 9 in his second
catalog of emission nebulae as Sh 2-221. But it was Sidney van
den Bergh (University of Toronto) who in 1960 was the first to
identify the 2°-wide nebula as a possible supernova remnant.
Today, we know that HBH 9 lies approximately 1,800 lightyears
away and is between 4,000 and 7,000 years old.
Photographically, the object's eastern and western sides are
the brightest. Cataloged as LBN 759 and LBN 754, respectively,
I've yet to see either without using a nebula filter in my
scopes. However, I can report that HBH 9 is unique for having
a 0.75°-wide section centered near right ascension 5h 04m
and declination +46° 30′ (part of LBN 759) that became
faintly visible in my 6-inch reflector at 37× when I used a
hydrogen-beta filter. Truthfully, though, I'll be spending more
time on this one this new year!
I know that cold temperatures can make observing in the
winter more demanding. But the region towards the Galactic
Anticenter is so full of bright, exciting objects that you simply
must explore it. As I like to say, Auriga truly has it all!
¢ The research for this article took Contributing Editor
SCOTT HARRINGTON on quite a journey. When he dreamed
it up, he knew nothing about the discoverer of CRL 618, nor
had he even heard of UGC 3596 or HBH 9! Now he wishes to
thank Eric Becklin, Michael Werner, Steve Beckwith, and
Ian Gatley for sharing their memories of their former colleague
Bill Westbrook.
sk yand tele scope .o r g * JANUARY 2025 25

http://skyandtelescope.org

Sky & Telescope - January 2025

Table of Contents for the Digital Edition of Sky & Telescope - January 2025

Contents
Sky & Telescope - January 2025 - Cover1
Sky & Telescope - January 2025 - Cover2
Sky & Telescope - January 2025 - 1
Sky & Telescope - January 2025 - Contents
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Sky & Telescope - January 2025 - Cover3
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