Zeke’s Place – March 08, 2008

Location: Tomball
Temperature: upper 40’s
Clouds: none
Seeing: average (3/5)
Transparency: good (4/5)
Instrument: 8″ SCT

First night to observe from Zeke’s place. The sky is slightly darker than home and the area has wider overhead field of view than home.

Observed Saturn in 25mm, several moons visible. Titan, Rhea, and Iapetus were clear. Dione sometimes faded out with bad seeing. Tethys was occasionally visible but quite faint just above and to the left of the rings. Both Dione and Tethys were easier in the 15mm, which developed a smudge.

Also visited a few double stars. Iota cancri was splendid contrast of red and blue.

We observed m42 and discussed the process of star formation within nebulae.

Zeke wanted to see Mars. The “dark” patch of Syrtis Major was visible — an area of just slightly diminished brightness compared with the rest of the planet.

Open Clusters, Doubles, & Saturn – March 04, 2008

temp: 53F-46F
humidity: 37%-70%
transparency: 4/5 – 5/5
seeing: average 3/5

Attempted M1 (Crab Nebula) with 25mm, 32mm, 10mm, could not discern any nebulosity
using 25mm
M35 – dozens of stars, many bright – bow shape in center
M36 – moderately bright cluster, some linear patterns
M37 – faint cluster, few lines, bright center star
M38 – odd abstract bilateral symmetry of four rays (two short, two long), center star

M41 – behind a tree
M42 – observed to test dark adaptation of my eyes after failing to see M1. region is impressive as a cluster

M46 – wide cluster in 32mm, celestron controller indicated nebula in field of view, but I could not discern any
M47 – several bright stars, prominent lines, one tight pair of similar magnitude
M48 – dozens of similar magnitude stars, no prominent lines, many “wide” pairs
M50 – sparse cluster, wide magnitude range
M67 – dim cluster with pleasing random arrangement

Rigel – companion much fainter, 9.5″ separation
lambda orionis – similar magnitude companion 4″ separation, very close in 10mm but distinct during moments of good seeing
sirius – could not discern companion

Saturn was bright, Titan clear. Dione was dim but distinct. Rhea was very faint, disappearing at times with poorer seeing.

Double-Star Night – February 17, 2008

Location: Tomball, TX
Cloud cover: none
Transparency: good (4/5) or maybe excellent (5/5)
Seeing: good (4/5)
Darkness: city sky glow, nearly full moon
Limiting Magnitude: n/a
Wind: mild w/ occasional gusts
Humidity: 60% early up to 75% later
Temperature: 60F to 53F
Start Time: 8:30 pm CST
End Time: 11:00 pm CST
OTA: 8″ SC

aligned on capella, sirius, castor, and ruchbah (celestron spells it rukbah). goto could sometimes put target in 9mm field.

double star night – observed four doubles.

polaris (alpha ursae minoris) – always see polaris/double when aligning, but spent extra time observing. primary is significantly brighter than secondary, but both are clear even in 25mm. would like to learn how to use angle and separation to align scope on true north.

castor (alpha geminorum) – two blue stars with similar magnitudes. easy split in 15mm.

photo: castor

algeiba (gamma leonis) – closest pair of the evening, two red stars with moderate difference in brightness.

iota cancri – widest pair of the evening, red primary moderately brighter than blue secondary.

photo: iota cancri

planetary observations

mars – imaged with and without the bushnell barlow. color and clarity of image both deteriorated. with 7.9mm other pinpoints visible, did not check SNP until later, not sure if one of the points may have been phobos or deimos. despite generally good conditions could not discern much detail except one edge seemed to have a touch of blue/white.

saturn – in high-power ep dione like a chick right under saturn’s “wing”, rhea less than a ring radius away, titan 3-4 ring diameters away. with lower power iapetus seen farther away on the other side of planet from other moons. several other stars also in wide field, required SNP reference to pick iapetus from stars.

photo: Saturn with Dione, Rhea, and Titan (click image to see Titan)

moon – viewed terminus briefly to estimate seeing conditions. very little turbulence in 15mm. still have no idea how to identify what I’m looking at.

view all photos at flickr

Camera working! February 13, 2008

Location: Tomball, TX
Cloud cover: none
Transparency: good (4/5)
Seeing: good (4/5)
Darkness: city sky glow, waxing crescent moon
Limiting Magnitude: n/a
Wind: mild/none
Humidity: 75% early up to 85% later
Temperature: mid-40’s
Start Time: 8:30 pm CST
End Time: 10:30 pm CST
OTA: 8″ SC

Used additional calibration star during setup, goto was very good.

Tonight the Celestron NexImage camera worked, as opposed to last night’s useless performance. Only major change that I’m aware of was that this time I ran the camera indoors until the scope was set up. Last time I set everything outside, including the camera. Maybe the temp of the electronics was below spec’ed operating range?

Captured several images of mars, luna (with and without focal reducer), and trapezium. Learning curve has just begun. Atmospheric turbulence easily seen in real-time video of lunar craters. Attempted to image Saturn but it was still low in the sky so I could not get good focus.

photo: trapezium – note line of stars left, 3rd star very faint

Observed double star Almech (gamma andromeda), easily split with 15mm. Similar magnitude, brightest with a touch of yellow, second star deep blue.

Betelgeuse yellow with orange at the fringe. Lots of scattering (as with all tonight’s observations) due to humidity.

M34 – dim open cluster in 32mm. Nearly symmetrical pattern of thirteen stars near center like a goose with wings outstretched.

Follow-up Notes

Later reference using SNP reports the dimmest of the four trapezium stars, which it calls Trapezium1B, as mag 7.46. This star is quite dim in the NexImage, although it is easily seen in any of the eyepieces. Also visible in image (but very, very faint) is mag 8.43 star TYC4774-935-1. Transparency was not perfect last night, but even so it appears the NexImage will only be useful for stars of mag 6 or brighter.

Video capture file of Mars was corrupt. Let that be a lesson: next time take multiple images.

CCD has dust on surface and lint that affects image. Needs to be cleaned.

Asteroids and Multiple Stars – February 07, 2008

Location: Tomball, TX
Cloud cover: none
Transparency: clear
Seeing: poor (2/5)
Darkness: city sky glow, no moon
Limiting Magnitude: n/a
Wind: mild/none
Humidity: 55% early up to 75% later
Temperature: upper-40’s
Start Time: 7:30 pm CST
End Time: 10:30 pm CST
OTA: 8″ SC

Didn’t learn star names in Cassiopeia, but looked them up on the laptop. Found a site that called Alpha Cas by the name Shedir, but NexStar didn’t list that name. Delta Cas was listed as Ruchbah, which was easily found. I aligned with Ruchbah, Sirius, and Capella, and the goto performed quite well all night.

Took significantly longer to find Ceres tonight than last night, even though tonight I had the laptop with SNP. There were several relatively bright stars nearby, widely dispersed with no obvious pattern. Another problem is conflicting orbital data; one set matched last night’s observations, while the other set matched tonight’s. Ugh. Anyway, Ceres sat at the 90 angle of a bright triangle. Also tried finding last night’s location, but some of the faint stars in that pattern were not visible.

Eunomia didn’t take too long to find. It sat between a boat-like squashed trapezoid of four stars and a narrow wedge of five dimmer stars.

Used NexStar’s tour function; it suggested Eta Cassiopeia and M103. The double star Eta Cas was very nice; the primary seemed white while red companion showed better color in the 25mm ep than the 10mm.

Internet photo of Eta Casseopeia

The open cluster M103 was not as bright as I expected. The narrow field easily fit in the 25mm view.

The field of view estimates in SNP seem a bit wide. The 32mm’s actual field was about the same size as SNP’s estimate of the 25mm field. Need to revisit that some time.

Entry for June 06, 2007 – Observational Notes

Location: Tomball, TX
Cloud cover: 5%-10% – Stratus – up to 80% later
Transparency: avg.
Seeing: avg (3/5)
Darkness: city sky glow, no moon
Limiting Magnitude: 4 (unaided), 9-10 (scope)
Wind: mild
Humidity: 65%-70%
Temperature: mid-70’s
Start Time: 9:30 pm CDT
End Time: 11:00 pm CDT

Instrument: Bushnell 3″ Newtonian

Venus: bright half disc resembling 1st quarter moon.

Saturn: crisp outline and ring separation; Titan trailing ~3 ring diameters behind planet.

Graffias (beta1 Sco): split double beta2 Sco with 7.9mm eyepiece. Both stars nice blue.

Jupiter: clear disc, no cloud bands visible. Moons Europa, Io, Ganymede, and Callisto trailing eastward, followed by HD 152516 (HIP 82734) at ~2X separation of Jupiter-Callisto.

Increasing cloud cover made further observing difficult.

Entry for September 26, 2006

Saw Albireo double blue and yellow, very nice. Didn’t realize last night I should have been looking for double-double in epsilon Lyra. Revisited tonight, but could not resolve inner doubles with 3″ newtonian and 7.9mm eyepiece.

Also shopped nebula filters today; considering buying the Meade #908N Narrowband Nebular Filter.

Entry for September 20, 2006

Good seeing last night, although it seemed like there was more ambient light pollution than normal. Overcame starhopping problems with a little help from Sean and my $25 Academy 10×50’s. Saw Neptune, Uranus, alpha1-Capricorni and alpha2, and M31.

Also tried M8 and M20, but could not make out any nebula detail due to light pollution.

Night air was cool and dry, but still warm enough for mosquitos. Ugh.