NGC 4449 is an irregular galaxy in the constellation Canes Venatici. It is located about 12 million light-years away, part of the M94 Group, a galaxy group relatively close to the Local Group.
Just showing off my rig. LXD75-sn10 with Crayford motorized focuser, using the Meade DSi imager as a guide scope (with Orion flip mirror), prime focus w/ Cannon T3 Rebel, ASCOM focuser, dew strip on the lens, all attached to my laptop which is remote accessed from my warm home office via RealVNC.
Clear night. Moon and Jupiter on the meridian. For this session, I used APT to capture the images. I usually use two astro-photography applications: BackyardEOS and APT. I use APT when imaging the Moon and bright planets because APT provides short exposures down in the 1/100th range: and these short exposures are needed with these very bright objects. The magnified Lunar image was produced with eyepiece projection: a 9mm eyepiece with Canon T3 Rebel. That with a 10-inch aperture with f/4 would be about 113x magnification.
A first attempt at radio astronomy. Since I am a registered ham radio operator (FCC General class), I might as well put the radio to use on listening to the cosmos besides terrestrial communications. I have been reading up on radio noise from Jupiter within the 18-22Mhz frequency range, and my radio can access that range, as this is within the 17 and 15Meter amateur radio bands. No results yet, I have yet to find that noise… Anyhow, here is a link to the radio noises recorded from Jupiter by NASA.
So what do the signals sound like? There are two distinct types: L-bursts sound like
ocean waves breaking up on a beach, and S-bursts, which can occur at rates of tens of
bursts per second, sound like popcorn popping or a handful of gravel thrown onto a
Have you heard them? Late at night is the best time, when the ionosphere has become
transparent and most terrestrial signals have disappeared on the 15 meter band. The quiet
hiss in your headphones comes mostly from relativistic electrons spiraling in the galactic
magnetic field. L-bursts and S-bursts are heard above this background noise. A radio
noise storm of L- or S-bursts can last from a few minutes to a couple of hours (Figure 1).
Do you need a giant antenna spread out over several acres? Fortunately not — a ham
band Yagi will do very nicely. Even if Jupiter is 30º or 40º above your horizon, a lowmounted Yagi aimed toward the azimuth of Jupiter will probably have adequate gain. And you don’t need a cryogenically-cooled front end either; your favorite ham-band receiver is plenty sensitive. Just be sure to turn the AGC off, as AGC can severely distort the Jovian noise bursts. Probably the best frequency range is between 18 and 22 MHz, so if you are using a ham-band only receiver, try the 15 or 17 meter bands. Either AM or SSB
modes will work. Just tune for a quiet spot between the stations.
During a good storm, Jovian signals can be easily heard, often several dB above the
background noise. Of course, the bigger your antenna the stronger the signals. The
640-dipole, 26.3 MHz, phased array antenna at the University of Florida would yield signals well over 20 dB above the background (Wallace & Flagg 2010).
Here is a screenshot of Radio-Jupiter Pro: software that predicts Jupiter radio storms.
My next planned target is Jupiter. Not at prime focus either – boring! I will use oculars 25mm, 9mm, and possibly 4mm. This week’s weather is too cloudy and cold. Observing possible the week of April 11th.
Read about it at Sky and Telescope
I have been looking through some older images and found these: they are from different times in 2014, and I simply increased contrast and adjusted brightness. The nebulousness is quite faint in these images, so click on them and get a close look…
Part of the Crescent Nebula: an emission nebula in the constellation Cygnus, about 5000 light-years away. This exposure captures part of it:
NGC6960: a faint view of part of the Veil nebula within a vast star field in Cygnus:
NGC663 In Cassiopeia:
Clear night with the July 4th fireworks. I used a Zhumell skylight filter but it is not very effective. Soon purchasing an OIII filter… Here are a few grainy images.
Study of Coma Berenicis. The night sky was mostly clear with thin clouds intermittent. High light pollution: not at my dark site tonight. This night I was using a skylight filter from Zhumell: it did cut down somewhat on stray light and gave a colorful tinge to images. Each image is 10 exposures at 15-25 seconds with an ISO of 800. In order, we have M64, binary system Cor Caroli, cluster M53, and a favorite edge-on spiral galaxy NGC4565.