Lunar Limb Profile
The two stars form a double with graze paths separated by just over 10 km. On the graze line for ZC 2066, the secondary SAO 158556 will disappear a few minutes earlier and reappear at the lit limb. On the graze line for SAO 158556, the primary ZC 2066 will miss the Moon's limb.
This is a multiple system, Occult lists two other, much closer, components of ZC 2066. Thus stepped events are likely.
Grazing Occultation of 2066 SA1 Magnitude 6.6
Date 2008 August 8 (Friday) Nominal site altitude 0m
E. Longit. Latitude U.T. Sun Moon TanZ PA WA CA
o ' " o ' " h m s Alt Alt Az o o o
172 0 0 -41 18 5 9 49 37 35 273 1.42 196.5 178.20 2.68S
172 10 0 -41 16 56 9 49 47 35 273 1.43 196.5 178.16 2.72S
172 20 0 -41 15 46 9 49 56 35 273 1.43 196.4 178.12 2.76S
172 30 0 -41 14 35 9 50 5 35 273 1.44 196.4 178.08 2.80S
172 40 0 -41 13 24 9 50 15 35 273 1.45 196.4 178.04 2.84S
172 50 0 -41 12 11 9 50 24 34 273 1.46 196.3 178.01 2.88S
173 0 0 -41 10 57 9 50 33 34 273 1.47 196.3 177.97 2.92S
173 10 0 -41 9 43 9 50 42 34 272 1.48 196.2 177.93 2.95S
173 20 0 -41 8 27 9 50 51 34 272 1.49 196.2 177.89 2.99S
173 30 0 -41 7 11 9 51 0 34 272 1.49 196.2 177.85 3.03S
173 40 0 -41 5 53 9 51 9 34 272 1.50 196.1 177.82 3.07S
173 50 0 -41 4 35 9 51 18 33 272 1.51 196.1 177.78 3.11S
174 0 0 -41 3 16 9 51 27 33 272 1.52 196.0 177.74 3.14S
174 10 0 -41 1 56 9 51 36 33 271 1.53 196.0 177.70 3.18S
174 20 0 -41 0 35 9 51 45 33 271 1.54 196.0 177.67 3.22S
174 30 0 -40 59 13 9 51 54 33 271 1.55 195.9 177.63 3.26S
174 40 0 -40 57 50 9 52 3 33 271 1.56 195.9 177.59 3.29S
174 50 0 -40 56 26 9 52 12 33 271 1.57 195.9 177.55 3.33S
175 0 0 -40 55 2 9 52 20 32 271 1.57 195.8 177.52 3.37S
175 10 0 -40 53 36 9 52 29 32 271 1.58 195.8 177.48 3.40S
175 20 0 -40 52 10 9 52 38 32 270 1.59 195.8 177.44 3.44S
175 30 0 -40 50 42 9 52 46 32 270 1.60 195.7 177.41 3.48S
175 40 0 -40 49 14 9 52 55 32 270 1.61 195.7 177.37 3.51S
175 50 0 -40 47 45 9 53 3 32 270 1.62 195.6 177.34 3.55S
176 0 0 -40 46 15 9 53 12 32 270 1.63 195.6 177.30 3.58S
176 10 0 -40 44 44 9 53 20 31 270 1.64 195.6 177.26 3.62S
176 20 0 -40 43 12 9 53 29 31 270 1.65 195.5 177.23 3.66S
176 30 0 -40 41 39 9 53 37 31 269 1.66 195.5 177.19 3.69S
Path coordinates are referred to WGS84 (as used by GPS).
2066 is multiple : 6.8 7.7 0.100" 0.0 : 7.3 8.3 1.20" 88.0 : 6.6 6.9 35" 295.0
Graze Path of component #2 0.18km South, and 0.1 secs. earlier cf. primary.
Graze Path of component #3 0.66km South, and 2.8 secs. later cf. primary.
Graze Path of component #4 10.64km South, and 83.6 secs. earlier cf. primary.
Librations Long +3.22 Lat +6.53
P +177.6 D +6.9
Illumination of moon 45%+
Elongation of Moon 84
Vertical Profile Scale 1.92 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.59 deg/min
Limiting Magnitudes for various telescope apertures (in mm)
CA\Tdia 50 100 150 200 250 300 350
-0.3 3.1 4.5 5.2 5.6 5.9 6.1 6.2
1.7 4.9 6.3 7.0 7.5 7.8 8.1 8.2
3.7 4.9 6.3 7.1 7.5 7.9 8.1 8.2
5.7 5.7 7.1 7.9 8.4 8.7 9.0 9.2
7.7 5.7 7.1 7.9 8.4 8.8 9.0 9.2
Grazing Occultation of 158556 WA2 Magnitude 6.8
Date 2008 August 8 (Friday) Nominal site altitude 0m
E. Longit. Latitude U.T. Sun Moon TanZ PA WA CA
o ' " o ' " h m s Alt Alt Az o o o
172 0 0 -41 23 58 9 48 10 35 274 1.41 196.6 178.28 2.61S
172 10 0 -41 22 51 9 48 20 35 274 1.41 196.5 178.24 2.65S
172 20 0 -41 21 43 9 48 29 35 273 1.42 196.5 178.20 2.69S
172 30 0 -41 20 33 9 48 39 35 273 1.43 196.5 178.16 2.73S
172 40 0 -41 19 23 9 48 48 35 273 1.44 196.4 178.12 2.77S
172 50 0 -41 18 12 9 48 57 35 273 1.45 196.4 178.08 2.81S
173 0 0 -41 17 0 9 49 7 35 273 1.45 196.3 178.04 2.84S
173 10 0 -41 15 48 9 49 16 34 273 1.46 196.3 178.00 2.88S
173 20 0 -41 14 34 9 49 25 34 273 1.47 196.3 177.96 2.92S
173 30 0 -41 13 19 9 49 34 34 272 1.48 196.2 177.93 2.96S
173 40 0 -41 12 3 9 49 43 34 272 1.49 196.2 177.89 3.00S
173 50 0 -41 10 47 9 49 52 34 272 1.50 196.2 177.85 3.03S
174 0 0 -41 9 29 9 50 1 34 272 1.51 196.1 177.81 3.07S
174 10 0 -41 8 11 9 50 10 33 272 1.51 196.1 177.77 3.11S
174 20 0 -41 6 52 9 50 19 33 272 1.52 196.0 177.74 3.15S
174 30 0 -41 5 31 9 50 28 33 271 1.53 196.0 177.70 3.18S
174 40 0 -41 4 10 9 50 37 33 271 1.54 196.0 177.66 3.22S
174 50 0 -41 2 48 9 50 46 33 271 1.55 195.9 177.63 3.26S
175 0 0 -41 1 25 9 50 55 33 271 1.56 195.9 177.59 3.30S
175 10 0 -41 0 1 9 51 3 33 271 1.57 195.9 177.55 3.33S
175 20 0 -40 58 37 9 51 12 32 271 1.58 195.8 177.52 3.37S
175 30 0 -40 57 11 9 51 21 32 271 1.59 195.8 177.48 3.41S
175 40 0 -40 55 44 9 51 29 32 270 1.60 195.8 177.44 3.44S
175 50 0 -40 54 17 9 51 38 32 270 1.61 195.7 177.41 3.48S
176 0 0 -40 52 49 9 51 46 32 270 1.62 195.7 177.37 3.52S
176 10 0 -40 51 19 9 51 55 32 270 1.62 195.6 177.33 3.55S
176 20 0 -40 49 49 9 52 3 31 270 1.63 195.6 177.30 3.59S
176 30 0 -40 48 18 9 52 12 31 270 1.64 195.6 177.26 3.62S
Path coordinates are referred to WGS84 (as used by GPS).
158556 is double : 6.9 6.6 35" 115.0
Graze Path of component #2 10.57km North, and 83.8 secs. later cf. primary.
Librations Long +3.22 Lat +6.53
P +177.6 D +6.9
Illumination of moon 45%+
Elongation of Moon 84
Vertical Profile Scale 1.92 km/arcsec at mean distance of moon
Horizontal Scale Factor 1.59 deg/min
Limiting Magnitudes for various telescope apertures (in mm)
CA\Tdia 50 100 150 200 250 300 350
-0.4 3.1 4.5 5.2 5.6 5.9 6.1 6.2
1.6 4.9 6.3 7.1 7.5 7.8 8.1 8.2
3.6 4.9 6.3 7.1 7.5 7.9 8.1 8.3
5.6 5.7 7.1 7.9 8.4 8.7 9.0 9.2
7.6 5.7 7.1 7.9 8.4 8.8 9.0 9.2