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The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199

March 31–April 7, 2016: The double star 54 Leonis offers small-telescope owners a nice view, while large-telescope owners can seek out spiral galaxy NGC 3198 in Ursa Major and emission nebula NGC 3199 in Carina.
carina-constellation
You can find mission nebula NGC 3199, which lies in Carina the Keel, 4.4° southeast of magnitude 3.5 Phi (φ) Velorum.
Astronomy: Roen Kelly
Each week, Astronomy magazine Senior Editor Michael E. Bakich, a master at explaining how to observe, posts a podcast about three or more objects or events you can see in the sky.

Targets for March 31–April 7, 2016

Small telescope: Double star 54 Leonis
Large telescope: Spiral galaxy NGC 3198
Large telescope: Emission nebula NGC 3199
Downloadable File(s)

What hue do you view?
This week’s small-telescope target is one of Leo the Lion’s best double stars — 54 Leonis. To find it, point your telescope 6° northwest of magnitude 2.6 Zosma (Delta [δ] Leonis). The double star sits right on Leo’s border with Leo Minor.

You’ll love the color contrast here. Most observers see the magnitude 4.5 primary as off-white and the magnitude 6.3 secondary as deep blue. Some amateur astronomers, however, have reported the primary as a pale or robin’s-egg blue. Whatever hue you see, even a 3-inch telescope will separate the two stars, which lie 6.5" apart.

Bear-y good spiral
This week’s first large-scope object is spiral galaxy NGC 3198 in Ursa Major the Great Bear.

This object lies 2.7° north of magnitude 3.5 Tania Borealis (Lambda [λ] Ursae Majoris). It glows at magnitude 10.2 and measures 8.5' by 3.3'.

Through a 6-inch telescope, you’ll see an irregularly illuminated oval that appears more than twice as long as it is wide oriented northeast to southwest. A 14-inch scope at 300x shows lots of detail. A small, bright central region lies within an irregular halo that looks like truncated spiral arms. Only 2' north of the northeastern tip lies the magnitude 11.2 star GSC 3435:470.

The “C” in Carina
This week’s second large-telescope target is one some of you might have to travel south to see. It’s emission nebula NGC 3199 in the constellation Carina the Keel.

Look for this target 4.4° southeast of magnitude 3.5 Phi (φ) Velorum. It spans 20' by 15'. Through most telescopes, this nebula looks like a large, thick crescent that opens toward the east. Use a nebula filter for the best view.

Only the largest amateur instruments show some of the additional nebulosity that fills in a roughly circular shape. Near the crescent’s center lies the Wolf-Rayet star HD 89358, a massive, hot sun that generates lots of ultraviolet radiation and an intense stellar wind. In this case, the Wolf-Rayet star is sculpting out the gas surrounding it.

Expand your observing at Astronomy.com

The Sky this Week
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Observing Basics
Find more guidance from Senior Editor Michael E. Bakich with his Observing Basics video series.
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