Carbon Stars (Photos 51 – 75)
Key To Photo Listings:
AL Program Number / Object Name (Plate Solve Name) /
Date / Time (UTC) / Telescope ID / Comments
Click on the photo to see a larger image.
51. U Hya (HD 92055) / November 24, 2021 / 6:10 UTC / Chile 1
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52. VY UMa ( HD 92839) / November 10, 2021 / 3:10 UTC / Canary 1
Apologies for this overblown target. Little control available in Slooh as
evident here and elsewhere.
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53. V Hya / November 24, 2021 / 6:05 UTC / Chile 1 / NovaAstrometry would not annotate the photo, even after repeated attempts. I believe the central star is V Hya. It is part of a double star system. I have marked what I believe is its companion, Burnham 1428
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54. SS Vir (HD 108105) / December 9. 2021 / 8:10 UTC / Chile 1
Something is slightly amiss. Seems obvious that the target is the large reddish star. Sky Safari
and other sources designate it as HD 108105). But the solve annotates an adjacent star as HD 108105.
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55. Y CVn (HD 110914, called La Superba) / December 24., 2021 / 4:00 UTC / Canary 1
I took photos of this several times in an attempt to better capture this beautiful star.
Unfortunately, this is the best of the lot. Slooh allows insufficient controls to fully capture
some objects.
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56. RY Dra (HD 112559) / December 18, 2021 / 4:00 UTC / Canary 1
I made several attempts at this target. I was really dismayed with this result.
Unlike the case of some other duds, I was able to retrieve a luminance shot
that gives better evidence of the beauty of the star.
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57. SAO 157721 (HD 113801) / December 9, 2021 / 8:05 UTC / Chile 1
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58. V CrB (HD 141826) / October 15, 2021 / 21:00 UTC / Canary 1
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59. RR Her (HD 144578) / October 12, 2021 / 20:55 UTC / Canary 1
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60. V Oph (HD 148182) / Chile 2 / September 19, 2021 / 01:40 UTC
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61. GSC 3081:810 (HD 156074) / Oct 14, 2021 21:50 UTC / Canary 1
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62. TW Oph (HD 158377) / January 30, 2022 / 6:30 UTC / Canary 2
I tried numerous times to capture and identify this carbon star. The photo on the left was quite miserable. Turns out that the luminance channel was the cause of the blurring in the image. I tried recombining only the R, G, and B channels, but the result
showed little color. Oddly, Astrometry dot net did solve the image, as can be seen in the photo on the right. I add a third photo,
below, that I took on a subsequent night. It shows a far richer star field with no blur, but the red of the carbon star is very muted. This was the 100th photo I took for this program, which suggests it kind of ended in a thud!
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63. SZ Sgr (HD 161208) / September 18, 2021 / 01:35 UTC / Chile 2 / Note the density of the stars in the field. This portion of Sagittarius is close to the galactic center. The open cluster Messier 23 is just outside the frame, and a bit further lies Messier 24, another cluster that is part of the Sagittarius Star Cloud.
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64. GSC 3914:546 (T Dra ) / October 17, 2021 / 21:40 UTC / Canary 1
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65. FO Ver (HD 168227) / Chile 2 / September 19, 2021 / 01:45 UTC / Though you cannot see either in this frame, FO Ser lies near a line running between, and equdistant from, Messier 16 and Messier 17.
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66. AC Her (HD 170756) / Chile 2 / September 18, 2021 / 00:55 UTC
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67. T Lyr () / October 12, 2021 | 21:05 UTC / Canary 1 / This carbon star proved a challenge. First, the color photo that Slooh returned was of low quality. Despite numerous attempts (with the color photo and one of the RGB constituents as well), Nova Astrometry solved the image but would not annotate it. Using Sky Safari and the AAS World Wide Telescope, I was able to “place” the Slooh photo on a sky map. I annotated the Slooh photo with two arrows: the yellow arrow is T Lyr, and (I believe) the red arrow is pointing at SAO 67075. Hope this effort suits the requirements of the program.
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68. HK Lyr (HD 173291) / October 16, 20:21 / 22:17 UTC / Canary 1
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69. S Sct (HD 174325) / Chile 2 / September 19, 2021 / 01:50 UTC
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70. UV Aql (HD 176200) / OCT. 12, 2021 / 21:15 UTC / Canary 1
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71. V Aql (HD 177336) / Chile 2 / September 17, 2021 / 04:20 UTC
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72. V1942 Sgr (HD 180953) / Chile 2 / Sept. 23, 2021 / 2:10 UTC
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73. U Lyr (TYC 3134-1708-1) / December 18, 2021 / 4:00 UTC / Canary 1
In terms of target identification, this was this program’s greatest challenge.
See 5 photos below, top to bottom. The first photo was the best I could pull out
of Slooh after repeated attempts. The star field is very dense, and the presence
of NGC 6791 complicates things. I could not get Astrometry dot net to identify anything
except the open cluster (bottom center left). I dug up a luminance image from Slooh
(second photo down). Though it lacked color, I thought it might help clarify things.
I tried to solve the luminance image in both Astrometry dot net and Pixinsight.
No luck. Pixinsight has a function that strips out all but catalog stars.
The result is the third photo down. On a whim, I sent this stripped image to
Astrometry dot net and to my surprise, it solved the photo and annotated it with
Tycho catalog references (see the fourth photo). The Tycho annotated photo lacked
many of the stars in the original field and it was of a different scale than the original
photo (or so it seemed to me). I did some superimposing of the luminance photo and the
Tyco-annotated photo and came up with a best guess at the location of U Lyr. I added an
arrow to this best guess in the lowermost photo. Best I could do with what I had!
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74. UX Dra (HD 183556) / October 12, 2021 / 21:15 UTC / Canary 1
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75. NSV 11960 (HD 220515) / Chile 2 / September 18, 2021 / 01:40 UTC
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Forward to Carbon Star Photos 76 to 100
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