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Antares Rocket Launch
November 17, 2018

This image is the GOES-East regional view at 4:02 am EST on November 17, 2018, one minute after the launch from Wallops Island, Virginia, of an Antares rocket carrying a Cygnus cargo freighter to the International Space Station. It shows clear skies at Wallops, while New Jersey is blanketed in clouds, precluding any chance to see the ascending rocket from the Philadelphia area, the NJ Pines or East Point, NJ.

 

Comet Sightings
November 2018

I don't have any pictures yet, but I did manage to spot comet 46P/Wirtanen on Wednesday night, October 30, 2018, between 10:45 and 11:00 pm EDT from Carranza Field in Wharton State Forest, NJ. 46P is currently around ninth magnitude, but it is expected to reach naked-eye visibility in mid-December, 2018, when it's at both perihelion and a close perigee only days apart (December 12 and 16 respectively). As of the end of October and the beginning of November 2018, 46P is not well positioned for observers at mid-northern latitudes with a declination of 33S, but it's southerly direction of movement bottoms out on November 3, ≈11 pm EDT (Nov 4, ≈03:00 UT) and then it will be heading north for it's hopefully bright, mid-December encounter, well placed for us at 40N in the constellation Taurus. 46P was spotted again, with less difficulty, from Atsion on November 10, 2018, with the 12.5-inch. While at Atsion on November 10, I also had a nice view of comet 64P/Swift-Gehrels in the 12.5-inch.

The following morning, November 11, 2018, I went to Carranza Field in Wharton State Forest and was able to spot recently-discovered comet C/2018 V1 (Machholz-Fujikowa-Iwamoto) with 15x56 binoculars near Porrima (Gamma Vir), and then I confirmed it with my 85 mm spotting scope. The next morning, November 12, I went to Swede Run in suburban Moorestown, NJ. I could not see C/2018 V1 with the 15x56 binoculars, but it was seen in the 85 mm scope.

 

Venus Sightings
October 2018

The planet Venus will be at geocentric inferior conjunction with the Sun, 6.26 south of it, on Friday, October 26, 2018, at 14:16 UT1 (10:16 am EDT). It will be 61.3" diameter and 0.6% illuminated. In anticipation of spotting Venus in the daytime at the moment of inferior conjunction, weather permitting, I'd been "practicing" looking for it on clear days this month, mostly with my 15x56 binoculars, but also with my 85 mm spotting scope (capable of 27 to 60x) in the final days before October 26. The sightings are tabulated below, the times being when initially spotted:

 

Date (2018), Time (EDT)

Optics

Observing Location

Diam.  Illum.  Elong.

October 07, 6:42 pm 15x56 Swede Run, Moorestown, NJ

51.6"   11.0%   27.1

October 10, 3:00 pm 15x56 Backyard, Maple Shade, NJ

53.7"    8.6%   24.0

October 12, 5:43 pm 15x56 Atsion, Wharton SF, NJ

55.3"    6.9%   21.6

October 17, 1:35 pm 15x56 Backyard, Maple Shade, NJ

58.4"    3.5%   15.5

October 22, 2:19 pm 15x56 Front Yard, Maple Shade, NJ

60.6"    1.2%    9.2

October 24, 10:10 am
October 24, 11:55 am
15x56
85 mm

Backyard, Maple Shade, NJ
Backyard, Maple Shade, NJ

61.1"    0.8%    7.3

October 25, 10:42 am
October 25, 12:35 pm
15x56
85 mm

Front Yard, Maple Shade, NJ
Backyard, Maple Shade, NJ

61.2"    0.6%    6.6

October 26, 10:16 am n/a Cloudy in Maple Shade, NJ

61.3"    0.6%    6.3

October 30, 1:39 pm 15x56 Backyard, Maple Shade, NJ

61.0"    1.1%    8.6

Diam. = Diameter, Illum. = Illumination, Elong. = Elongation* (for Venus in each case)

* As used here, the direct distance from Venus to the Sun measured with SkyTools (center-to-center) rather than the difference in ecliptic longitude. Diameter and Illumination are from the U.S. Naval Observatory, either online or via their MICA software.

Note that the sighting on October 7 was actually 9 minutes after sunset, so it's technically a nighttime sighting. The appearance on October 7 was like a wiggling, thick orange banana due to atmospheric absorption and distortion since Venus was only 3 altitude at the time. The rest of the sightings were higher in a blue sky and showed a sublime, silvery crescent, but in each case, the crescent looked wider than the illuminated percentage provided by the USNO would suggest. This is due to the phenomenon of irradiation. In addition, near the sun, forward scattering causes seed tufts (pappi; singular, pappus) to shine brightly as they blow by the sun, confusing the view. They were first noticed (for this conjunction) as a mild annoyance on October 22, and on October 24, were becoming annoying, perhaps because it was windy. I have not been able to see Venus in the daytime with my unaided, aging eyes.

On October 24, I went back out with my 85 mm spotting scope for another look and picked up Venus at 11:55 am EDT using the minimum magnification, 27x, then immediately increased it to the maximum, 60x. I followed it until 12:10 pm. The crescent looked relatively thinner than it did in the binoculars at 15x (less irradiation at the higher power?). The bright part of the thin crescent appeared to extend at least 180 around the circumference, and at moments of steady seeing and no wind jiggle, a vague rim of illumination seemed to wrap the entire circumference on the dark side. The dark side also seemed slightly brighter than the surrounding sky. It was a sublime view. I went on to spot all the remaining major planets on this date, Mercury, Jupiter, Saturn and Mars just after sunset, ca. 6:30 pm, and then Uranus and Neptune around 9 pm. See my Mercury page for details.

On October 25, it was difficult to pick up Venus with the 15x56 binoculars, but not too difficult to see once found (as before, the crescent appeared thicker than the percentage illuminated would suggest. The sky was generally blue but there were some high thin clouds passing the sun, and on the second pickup, I lost Venus in one of seemingly thin passing clouds. I was back out with the 85 mm spotting scope and picked up Venus at 12:35 pm (since I observed for 10 minutes, until 12:45 pm, my last view was 21 hr 31 min or 21.5 hours before inferior conjunction). Yesterday's spotting scope comments still hold true for today, but I would also add that the crescent seemed proportionately thicker at the scope's lowest magnification of 27x vs. the maximum 60x. There was little wind today, and perhaps correspondingly, few seed tufts blowing by.

On the morning of October 26, it was mostly overcast with the sun peeking out occasionally. The complete lack of a clear blue sky precluded looking for Venus. The forecast for the rest of the day, and the next few days, also looks unfavorable. I suppose I can take solace in having seen Venus in a scope less than a day before inferior conjunction.

This completes the observations of Venus for this eastern (evening) elongation, the initial sighting being on January 18, 2018, when it was spotted with 15x56 binoculars 2.5 east of the Sun at 1:20 pm EST, nine days after superior conjunction on January 9.

After inferior conjunction on October 26, western elongation (morning) begins. I failed to find Venus on Monday afternoon, October  29, around 1 pm from the backyard (between passing cumulous clouds), then twice on Tuesday morning, October 30 (around sunrise at 7:27 am from Swede Run, then around 10:15 am from the front yard), both times with 15x56 binoculars in a clear sky. I finally spotted Venus with the 15x56s at 1:39 pm from the backyard. The crescent was fairly easy to see once found in a clear blue sky. That concluded my October 2018 observations of Venus.

 

Mercury Update
October 2018

Mercury has seven elongations in 2018. The initial sighting for each of these is tabulated below:

 

Sequence

Initial Sighting Date (2017/18)

Observing Location

Greatest Elongation (2018)

#1

December 24, 6:10 am EST Swede Run, Moorestown, NJ

January 1, western (morning)

#2

February 26, 5:56 pm EST Baseball Fields, Maple Shade, NJ

March 15, eastern (evening)

#3

April 22, 5:26 am EDT Old Mart Site, Pennsauken, NJ

April 29, western (morning)

#4

June 14, 8:41 pm EDT Swede Run, Moorestown, NJ

July 12, eastern (evening)

#5

August 24, 5:10 am EDT Swede Run, Moorestown, NJ

August 26, western (morning)

#6

October 13, 6:41 pm EDT Swede Run, Moorestown, NJ

November 6, eastern (evening)

#7

    December 15, western (morning)

Click here for the sighting details of each elongation this year. The current sighting streak is now 50 elongations in a row, starting in January 2011, which includes seven complete calendar years of six or seven elongations. The years 2011 and 2015 had seven (7) elongations each, while 2012, 2013, 2014, 2016 and 2017 had six (6) each. Click here for sightings from last year's elongations.

 

 

Comet 21P/Giacobini-Zinner
September 5, 2018

This image shows Comet 21P/Giacobini-Zinner, captured on September 5, 2018, at 1:26 am EDT from Swede Run in Moorestown, NJ. It was taken with a Canon 6D digital SLR camera and a Canon 200 mm f/2.8L telephoto lens (on a fixed tripod). Exposed 2 seconds at f/4, ISO 5000, 3800K white balance. Except for size reduction, no processing was applied. Mouseover for labels; the image below is a magnifying crop of the comet area.

 

This is the same original image as above, but cropped to about a fifth of the original linear dimensions for a field 2.0 wide x 1.6 high (originally 10.2 x 6.8). It may be my imagination, but there seems to be a vague tail extending towards Rho Aur (≈ west). At the time, the coma and Rho were about 42 arc minutes apart. Except for cropping and size reduction, it's unprocessed. Mouseover for labels.

I've been following this comet since August 4, 2018, when I initially saw it with 15x56 binoculars at Batsto in Wharton State Forest, NJ. I last saw the comet on September 4 around 5:15 am EDT at Swede Run (where astronomical twilight began at 4:56 am). Auriga was high overhead in a clear sky (foggy near the ground), but there was a 36% illuminated moon 24 away in Orion close to the border with Gemini. Regardless, I saw 21P with relative ease in the 15x56s.

On the morning of September 5, I wanted to beat moon rise at 1:34 am, so I was at Swede Run looking (and taking pictures) between 1:00 and 1:30 am. The sky was generally hazy and there were streaky clouds lower in the sky in front of Auriga (the comet was about 25 altitude). As a result, I could not convincingly see 21P in the 15x56s.

Bob King has an online article at Sky & Telescope about observing 21P/Giacobini-Zinner in September 2018.

 

 

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Last Update: Saturday, November 17, 2018 at 10:53 AM Eastern Time