DAS Activities

DAS Public Nights

Public Nights
Tuesday and Thursday at
DU's Historic Chamberlin Observatory
Current start time is 8:30 pm.

Costs to the public are:
$4.00 adults, $3.00 children

To book, please click:

Public Night Reservations



Astro Calendar

“What’s Out Tonight – July 2019”
Star Chart and Data
(courtesy of Ken Graun © 2019)

Astronomical Things to See and Do – July 2019

(NOTE: to find the MST for UT, subtract 7 hours from the UT listing)


46P/Wirtanen (2018) Ephemeris   (from In-the-sky.org)

Images and Sky Map on Weekly Comet News

Weekly Comet News: http://www.aerith.net/comet/weekly/current.html

NASA Web page on comets: http://nssdc.gsfc.nasa.gov/planetary/planets/cometpage.html

Planetary Phenomena

Planets in July 2019LocationAvg MagnitudeAvg SizeNotes
MercuryEvening sky early in July; conjunction on the 21st.-2.611.1"
VenusUnobservable until September-3.99.8"
MarsVery low in western sky; superior conjunction in early September+1.83.6"
JupiterSouthern sky all night-2.544.8"
SaturnIn Sagittarius; visible all night+0.1 18.4"Opposition on July 9th
UranusMorning twilight in Aries5.83.5"
NeptuneOvernight and morning in Aquarius7.92.3"

Moon Phases & Info: https://moon.nasa.gov/

Moon PhenomenaDateUTComment
New MoonJuly 2nd 19:16Lunation 1194
1st QuarterJuly 9th 10:55
Full MoonJuly 16th 21:38Buck Moon
Third QuarterJuly 25th 01:18

Meteor Showers This Month

Shower NameUT /peak hrDuration (Days)Hourly Rate (ZHR)% Above HorizonMoon Phase
Particle Size - r
(smaller# = larger size)
RADecv - speed (km/sec)Parent
Aquariids July 29th/10h820>23-16 (waning)3.2 22.44-1643 (moderate)

American Meteor Society: http://www.amsmeteors.org/meteor-showers/meteor-shower-calendar/


Notable Objects for Deep Sky Observers

Catalog #DescriptionRight
Globular Cluster (!)16 4.7+36 28Hercules
M10Globular Cluster16 57.1-04 06Ophiuchus
M6 & M7Star Clusters17 40.1
17 53.9
-32 13
-34 49
M57Planetary Nebula
18 53.6+33.02Lyra
M27Planetary Nebula
19 59.6-22.43Vulpecula
M11Open Cluster
(Wild Duck)
18 51.1- 6.16Scutum
NGC 6960, 6992/5, 7000Veil Nebula20 45.7 thru
+30.43 thru
NGC6888+Crescent Nebula
(Use nebular filter)
20 12.0+38 21Cygnus

Observing Opportunities

Open House – Saturday, July 13th 7:30 pm – 10:30 pm at DU’s Historic Chamberlin Observatory (Open to Public)

EGK Dark Site – Any night or Dark Sky Weekend, August 2-4. 2019 (Members & Guests)