Predictions for Grazing Occultation of ZC 2658, 2013 Apr 29
Graze profile
Grazing Occultation of 2658cF8 Magnitude 5.8 [Red = 5.4] V
R2658 = Y Sagittarii
Date: 2013 Apr 29 21h 28m, to 2013 Apr 29 21h 47m
Nominal site altitude 50m
E. Longit. Latitude U.T. Sun Moon TanZ PA AA CA
o ' " o ' " h m s Alt Alt Az o o o
112 0 0 -31 25 57 21 27 59 71 306 0.35 348.2 349.44 6.64N
112 30 0 -31 17 53 21 29 14 70 304 0.36 348.1 349.32 6.77N
113 0 0 -31 9 38 21 30 29 70 302 0.37 348.0 349.19 6.89N
113 30 0 -31 1 11 21 31 43 69 301 0.38 347.9 349.07 7.01N
114 0 0 -30 52 34 21 32 57 69 299 0.39 347.8 348.95 7.13N
114 30 0 -30 43 46 21 34 11 68 297 0.40 347.6 348.84 7.25N
115 0 0 -30 34 48 21 35 25 67 296 0.41 347.5 348.72 7.36N
115 30 0 -30 25 39 21 36 39 67 295 0.43 347.4 348.61 7.48N
116 0 0 -30 16 20 21 37 52 66 293 0.44 347.3 348.50 7.59N
116 30 0 -30 6 50 21 39 4 66 292 0.45 347.2 348.39 7.69N
117 0 0 -29 57 11 21 40 17 65 291 0.46 347.1 348.29 7.80N
117 30 0 -29 47 21 21 41 29 65 289 0.48 347.0 348.18 7.90N
118 0 0 -29 37 22 21 42 41 -12 64 288 0.49 346.9 348.08 8.00N
118 30 0 -29 27 13 21 43 52 -11 63 287 0.50 346.8 347.98 8.10N
119 0 0 -29 16 55 21 45 3 -11 63 286 0.52 346.7 347.89 8.20N
119 30 0 -29 6 27 21 46 14 -10 62 285 0.53 346.6 347.79 8.29N
120 0 0 -28 55 50 21 47 24 -9 61 284 0.54 346.5 347.70 8.38N
Path coordinates are referred to WGS84 (as used by GPS), with the
nominal site altitude being referenced to Mean Sea Level.
Projected diameter of star 2 meters [CHARM/CADARS, 2 measures]
2658 is variable:
2658 = Y Sgr, 5.25 to 6.24, V, Type DCEP, Period 5.77335 days, Phase 73 %
2658 is double:
This next pair is not confirmed
** 6.2 6.2 0.050" 350.0** (OCc1542) Graze path of ? 0.10 km south, and 0.0 secs later compared to the primary
Librations Long +2.10 Lat -5.36
P +348.25 D +5.09
Illumination of moon 78%-
Elongation of Moon 124
Vertical Profile Scale 1.92 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.42 deg/min
At longitude 116.00:
Limiting Magnitudes for various telescope apertures (in cm)
CA\Tdia 5 10 15 20 25 30 35
3.6 4.8 6.2 7.0 7.5 7.9 8.2 8.4
5.6 4.8 6.2 7.0 7.5 7.9 8.2 8.4
7.6 5.4 6.8 7.6 8.2 8.5 8.8 9.0
9.6 5.7 7.1 7.9 8.5 8.8 9.1 9.3
11.6 5.7 7.1 8.0 8.5 8.9 9.1 9.3
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Double star catalogue details
Interferometric catalogue entries
182122.99-185135.9 HR 6863 Y Sgr HD 168608 HIP 89968 18214-1852
Date PA Sep M1 M2
1975.634 . . < 0.027 . . . . . 540 20 5.1 1 Bla1977a S
1989.3123 . . < 0.035 . . . . . 549 22 4.0 1 Msn1999b Sc
1990.3469 . . < 0.035 . . . . . 549 22 4.0 1 Msn1999b Sc
1991.25 . . S . . 5.76 . . . 511 0.3 1 HIP1997h Hh
1995.3168 . . < 0.055 . . . . . 549 22 2.5 1 Msn1999b Sc
1996.5370 . . < 0.055 . . . . . 549 22 2.5 1 Msn1999b Sc
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AAVSO Variable star entry
Variable identifier Type Max Min Ph Epoch Period
Y Sgr DCEP 5.25 6.24 V 2440762.3800 5.77335
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Results of Observer Scan UT
Site Long. Lat. Dist. h m s
Perth 115.9 -32.0 170km 21 37 30
Lunar Limb Profile
