- Sketches (Deepsky) (UMa) -

And (1) Cas (5) Cyg (7) Her (4) Lyr (5) Sex (1)
Aur (4) Cnc (4) Dra (5) Leo (12) Ori (2) Tau (1)
Boo (2) Com (2) Eri (1) LMi (3) Per (6) Tri (1)
Cam (4) CVn (7) Gem (8) Lyn (9) Psc (1) UMa (10)

M 81 (GLX)

../dss/dss2blue_095533.17_+690355.06_25_web.jpg
Image source: DSS II (blue) - 25×25'
Name: M81, NGC3031, UGC5318, Bode's Galaxy
Group: M81 Group, Virgo Supercluster
Type: GLX
Constellation: UMa
Coordinates: 09h55m33.17s / +69°03'55.06"
Brightness / Size: 6m9 / 24.9x11.5'
Robert Zebahl
B 8x20, Bortle 3-, SQM-L 21.3
Oval, condensed brightening. Almost visible with direct vision.

EASY
B 8x40, Bortle 7, NELM 5m0, SQM-L 19.2
Quite apparent with averted vision, slightly oval with a bit brighter center.

MODERATE
B 8x40, Bortle 5+, NELM 5m7+, SQM-L 20.9
Oval with much more brighter center.

EASY
B 16x70, Bortle 6, SQM-L 19.2
Grand sight together with Messier 82! The galaxy shows a very bright, compact core with brighter central area and an oval, fading halo.

EASY
80mm f/6.25, 20x, Bortle 6-, NELM 5m0+, SQM-L 19.6
Conditions in the target region: SQM-L 19.3
Very bright, extended, round core with oval halo fading outwards.

EASY
120mm f/5, 18x, NELM 5m0
Observation at full moon. Oval with obviously brighter, also oval core area. Easily seen with direct vision.

EASY
120mm f/5, 86x, Bortle 6, SQM-L 19.3

../sketches/2019-02-26_m81.jpg

EASY
8" f/6, 37x, Bortle 4
At 37x very bright, slightly elongated core area with evident, oval halo. At 100x one spiral arm was seen with averted vision, beginning southwest of the center and winding over south to east. The spiral arm was separated by a dark lane in the southeast. 2 fainter stars within the halo south of the core.

EASY
René Merting
B 8x20, SQM-L 21.5
direkt hell und nicht ganz rund, zur Mitte heller werdend

EASY
B 10x50, SQM-L 21.5
ein runder nebliger Fleck zum Zentrum deutlich heller werdend - die Außenbereiche laufen diffus aus

EASY
B 16x70, SQM-L 21.5
Galaxie mit hellem kompaktem Zentrum und einem relativ großen schwachen äußeren Halo - leicht unrund

EASY
B 18x70, SQM-L 21.5
eine große, helle, ovale Galaxie mit einem hellen, länglichen Zentrum

EASY
12.5" f/4.5, 72x, SQM-L 21.5
bei 72x zeigt sich ein diffuser großer Nebelfleck mit deutlich hellerem Kernbereich - drei Vordergrundsterne sind innerhalb oder am Rand der Galaxie erkennbar
EASY

M 82 (GLX)

../dss/dss2blue_095552.43_+694046.93_12_web.jpg
Image source: DSS II (blue) - 12×12'
Name: M82, NGC3034, UGC5322, Arp337, H4.79
Group: M81 Group, Virgo Supercluster
Type: GLX
Constellation: UMa
Coordinates: 09h55m52.43s / +69°40'46.93"
Brightness / Size: 8m4 / 11.2x4.3'
Robert Zebahl
B 8x20, Bortle 3-, SQM-L 21.3
Very thin, elongated, evenly bright, faint.

MODERATE
B 8x40, Bortle 7, NELM 5m0, SQM-L 19.2
Elongated, thin, evenly bright. At the limit of perception.

DIFFICULT
B 8x40, Bortle 5+, NELM 5m7+, SQM-L 20.9
Very elongated, thin, evenly bright. Not particularly evident. Only well visible with averted vision.

EASY
B 16x70, Bortle 6, SQM-L 19.2
Grand sight together with Messier 81! The galaxy appears clearly elongated and almost uniformly bright. At one end sits a fainter field star.

EASY
70mm f/5.7, 22x, Bortle 6, SQM-L 19.2
At 22x elongated, fairly thin, nearly evenly bright. At 44x I could relatively well see 2-3 dark lanes with averted vision.

EASY
70mm f/5.7, 12x, Bortle 4, SQM-L 21.3
At 12x easily visible as elongated nebula. At 112x the dark lanes were pretty evident with averted vision.

EASY
4.5" f/8, 28x
Observation from outskirts at almost full moon with a angular distance of 60° from M82! At 28x barely seen with direct vision, very elongated, fairly thin, nearly evenly bright. Cigar-shaped. At 72x 2-3 dark lanes visible with averted vision, most obvious on the eastern edge.

EASY
120mm f/5, 18x, NELM 5m0
Observation at full moon: At 18x thin, elongated, evenly bright. At 75x 2 dark lanes apparent with averted vision.

EASY
120mm f/5, 86x, Bortle 6, SQM-L 19.3

../sketches/2019-02-26_m82.jpg

EASY
8" f/6, 37x, Bortle 4
Very bright, cigar-shaped, slight brightening toward the middle. At 100x up to three dark lanes across the width are evident with averted vision. The dark lane on the east side is most obvious. Awesome!

EASY
René Merting
B 8x20, SQM-L 21.5
direkt schmal und kompakt sichtbar - indirekt Elongation 2:1

EASY
B 10x50, SQM-L 21.5
länglicher gleichmäßig heller Nebelfleck

EASY
B 16x70, SQM-L 21.5
klein kompakt, hell und ein wenig gebogen wie ein Pinselstrich - zwei stellare Aufhellungen an einem Ende

EASY
B 18x70, SQM-L 21.5
eine schmale kompakte Galaxie oberhalb von zwei Sternen - M 82 wirkt sich leicht unruhig im Helligkeitsverlauf

EASY
12.5" f/4.5, 206x, SQM-L 21.5
bei 36x ist ein 3:1 elongierter Nebel mit relativ scharfer Abgrenzung zu sehen - das Ostende wirkt breiter - östlich vom Zentrum ist ein Kern erkennbar - bei 72x sind dunkle Flecken/Einkerbungen nahe dem Zentrum erkennbar - das Helligkeitszentrum scheint leicht nach Osten verschoben zu sein - bei 206x werden die Einkerbungen sehr deutlich, vor allem südlich
EASY

NGC 3231 (OC)

../dss/dss1_102657.80_+664855.00_5_web.jpg
Image source: DSS I - 5×5'
Name: NGC3231
Type: OC
Constellation: UMa
Coordinates: 10h26m57.80s / +66°48'55.00"
Brightness / Size: - / 4.0x4.0'
Robert Zebahl
120mm f/5, 66x, Bortle 6-, SQM-L 19.1
About 5 stars scattered. Not discernible as an open cluster.

../sketches/2018-04-10_ngc3231.jpg

MODERATE

STF 1331 (**)

Name: STF1331
Type: **
Constellation: UMa
Coordinates: 09h20m46.02s / +61°20'58.40"

Components:
m1 m2 ρ θ Year
AB 8m5 8m7 0.9" 153° 2017
AC 8m5 11m6 13.5" 186° 2015
AD 8m5 14m5 19.4" 117° 2015
AE 8m5 9m8 139.1" 223° 2015
Robert Zebahl
152mm f/5.9, 180x, Bortle 6, SQM-L 19.4
2020-04-13: The wide pair AE is already visible at 22x with a significant difference in brightness, but quite inconspicuous. A appeared white-yellowish, E rather orange. The close pair AB appeared immediately elongated at 129x, partly visible as '8'. At 180x, AB was just separated with a fine black space between them. The faint C component was only visible with averted vision. Best view at 180x. The even fainter D component was out of range.

../sketches/2020-04-13_stf1331.jpg

STF 1350 (**)

Name: STF1350
Type: **
Constellation: UMa
Coordinates: 09h34m19.56s / +66°47'42.30"

Components:
m1 m2 ρ θ Year
AB 8m3 8m3 10.2" 249° 2015
AC 8m3 9m2 131.0" 216° 2015
Robert Zebahl
70mm f/5.7, 22x, Bortle 6, SQM-L 19.6
2020-04-19: At 22x A & B equally bright and still pretty close together. Component C is visible at a much greater distance. At 44x, A & B show a color difference: orange, white-bluish.

152mm f/5.9, 100x, Bortle 6-, SQM-L 19.1
At 22x, all three components are already visible, with A & B still standing quite close together. Component C is less prominent. At 69x and 100x, the pair AB shows a nice color contrast: The eastern component mostly appeared in a slightly shiny orange, while the other component appeared more white-bluish. During the observation, however, the colors changed between both components. At the time of observation, the pretty bright comet C/2019 Y4 Atlas was also in the same field of view - a great scene! Note to the sketch: The positions of the stars to each other do not exactly match, also the alignment of the pair AB to C.

../sketches/2020-03-18_stf1350_c2019_y4_atlas.jpg

STF 1523 (**)

Name: STF1523, xi UMa, 53 UMa, Alula Australis
Type: **
Constellation: UMa
Coordinates: 11h18m10.90s / +31°31'45.00"

Components:
m1 m2 ρ θ Year
AB 4m3 4m8 2.1" 155° 2019

../images/binary-star-orbits/STF1523-AB-orbit.jpg

Robert Zebahl
55mm f/9.1, 83x, Bortle 6-, SQM-L 19.1
2019-02-09: Already seen as '8' at 83x. At 125x the overlapping of both Airy disks was visible, but also a slight difference in brightness.

../sketches/2019-02-09_xi_uma.jpg

70mm f/5.7, 100x, Bortle 6
2018-02-18: Very close together with similar brightness. At first glance seen as an '8', looking closer I partly split both components. Similar view also at 128x.

70mm f/5.7, 133x
2020-03-15: Splendid sight! Beautifully separated with almost touching diffraction disks. The rather small difference in brightness was well visible. The diffraction rings of both components coalesced.

102mm f/11, 160x
2020-03-16: Awesome! Bright with lovely, subtle diffraction rings. The distance between both components is a smaller than the diameter of the diffraction disk of the fainter component.

120mm f/5, 168x, Bortle 6, SQM-L 19.1
2018-02-14: Well split with slight difference in brightness.

152mm f/5.9, 129x, Bortle 6, NELM 5m0+
2019-02-06: Well split with visible difference in brightness. The colors of both components appeared equal.

STF 1559 (**)

Name: STF1559
Type: **
Constellation: UMa
Coordinates: 11h38m49.11s / +64°20'49.40"

Components:
m1 m2 ρ θ Year
6m8 8m0 1.9" 328° 2017
Robert Zebahl
70mm f/5.7, 133x, Bortle 6, NELM 5m0+
2020-04-14: Two clearly visible, slightly touching diffraction disks. The fainter companion appeared somewhat more diffuse. Occasionally the double star appeared separated.

../sketches/2020-04-14_stf1559.jpg

STF 1579 (**)

Name: STF1579, 65 UMa
Type: **
Constellation: UMa
Coordinates: 11h55m05.74s / +46°28'36.60"

Components:
m1 m2 ρ θ Year
AB-C 6m7 8m3 3.8" 40° 2017
AB-D 6m7 7m0 62.5" 114° 2018
Robert Zebahl
B 8x40
AB-D: 2020-04-05: Immediately conspicuous in the field. Medium bright double star with slightly uneven components. Western component AB appeared slightly orange, component D tended to be bluish.

55mm f/9.1, 83x, Bortle 6-, SQM-L 19.1
2019-02-09: AB, C & D easy to split, but the faint C component only appeared as a tiny star. To the south there is the brighter D component.

../sketches/2019-02-09_65_uma.jpg

55mm f/9.1, 27x, Bortle 6-, SQM-L 19.1
AB-D: Easy to separate with large distance and very small difference in brightness. The D component showed a bluish tint, the lighter one (AB) a slightly yellowish tint. At higher magnification also the faint C component is visible.

STF 1830 & STF 1831 (**)

Name: STF1830 & STF1831
Type: **
Constellation: UMa
Coordinates: 14h16m08.47s / +56°42'45.70"

Components:
m1 m2 ρ θ Year
STF1831 AB 7m2 9m6 5.8" 138° 2017
STF1831 AC 7m2 6m7 112.2" 219° 2017
STF1831 CD 6m7 13m1 112.1" 116° 2016
STF1830 CE 6m7 9m3 138.0" 245° 2016
STF1830 EF 9m3 10m3 10.6" 312° 2017
STF1830 EG 9m3 12m2 35.2" 81° 2017
Robert Zebahl
B 8x40
STF1831 (AC): 2020-04-05: Fairly wide pair with slight differences in brightness and color. C appeared slightly orange, A on the other hand slightly bluish. Comparatively bright double star, which gives a nice view.

55mm f/9.1, 27x
STF1831 (AC): 2020-04-05: Moderate difference in brightness. C: pale orange, A: subtle blue.

70mm f/5.7, 57x, Bortle 6
2020-04-11: At 22x the components AB, C, E & F are well visible and widely separated. E & F are comparatively faint. The C component in the middle appeared white-yellowish, AB rather white with a slight tendency to blue. At 57x, the pair AB with a clear difference in brightness can be easily split. An altogether rewarding and unusual multiple system.

../sketches/2020-04-11_stf1830_stf1831.jpg

zeta UMa (**)

Name: zeta UMa
Type: **
Constellation: UMa
Coordinates: 13h23m55.42s / +54°55'31.50"

Components:
m1 m2 ρ θ Year
STF1744, 79 UMa, Mizar AB 2m2 3m9 14.4" 153° 2017
STF1744, Mizar & Alcor AC 2m2 4m0 707.7" 72° 2017
SMR4 AD 2m2 7m6 492.8" 102° 2017
Robert Zebahl
B 8x40
AB: 2020-04-05: Even with tripod not separable.

70mm f/5.7, 10x
AB: 2020-04-12: Observation from city with a 70/400mm ED refractor, for which I made aperture masks from 10mm to 60mm. Goal was to find the minimum magnification for a successful split.

70mm: At 12.5x no separation of the components possible due to outshining. Grey filters brought a slight improvement, but again no separation or elongation was visible.

60mm: At 12.5x slight outshining of the companion, clearly elongated and almost separated.

50mm: At 12.5x the companion was almost outshined. A separation was just possible.

40mm: At 12.5x both components appear finely separated from each other.

30mm: At 10x not clearly separable due to outshining, but clearly elongated. At 12.5x then quite easy to separate with a fine star rendition.

20mm: At 10x the companion is still clearly visible, but quite close to the primary component. At 12.5x best view under the used apertures with a very fine rendition!

10mm: At 10x the companion appears very faint. Separation possible, but extremely tight. At 12.5x reasonably well separated.

70mm f/5.7, 22x, Bortle 6
AB: 2020-04-11: At 12x no separation possible, because the bright primary component outshines the companion. At 22x clearly separated, but still quite close together.

102mm f/11, 28x
First pastel sketch (Pitt pastel by Faber-Castell) of a double star on black paper, where also the halos were sketched around the stars. The stars themselves were redrawn with an Edding (Edding 1500, Soft Pastel white). The sketch shows the components A to D.

../sketches/2019-08-14_mizar_alcor.jpg