Tonight's Sky
Sun
Sun
Moon
Moon
Mercury
Mercury
Venus
Venus
Mars
Mars
Jupiter
Jupiter
Saturn
Saturn

Tonight's Sky — Change location

OR

Searching...

Tonight's Sky — Select location

Tonight's Sky — Enter coordinates

° '
° '

Make a mask for double stars

Some stellar pairs are too bright to separate with a large scope. An off-axis mask can help you easily split them.
RELATED TOPICS: OBSERVING
Over the years, I’ve always been an advocate for the small-aperture telescope, touting its remarkable capabilities in my writings and through talks at astronomy conventions and club meetings. During my salad days as an amateur astronomer, back in the 1970s, my telescopic arsenal was made up of a 3-inch f/10 reflector and a 2.4-inch f/11 refractor. Modest in size though they were, these high focal ratio instruments were remarkably capable — especially on double stars, my favorite night-sky targets.

Astronomy magazine subscribers can read the full article for free. Just make sure you're registered with the website.

Already a subscriber? Register now!

Registration is FREE and takes only a few seconds to complete. If you are already registered on Astronomy.com, please log in below.
ADVERTISEMENT

FREE EMAIL NEWSLETTER

Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. View our Privacy Policy.

ADVERTISEMENT
ADVERTISEMENT
RCLP_ASY_0301_mediumrectangle

Click here to download a FREE astrophotography PDF curated by Astronomy magazine.