The appearance of Venus from Earth is always changing in two ways; phase and apparent size. Currently it is in the crescent phase and becoming more and more illuminated. By mid-August it will look like a tiny half-moon in the telescope, and later on will become more gibbous as it moves towards the far side of the Sun from us. But even as its illumination is growing, it is looking smaller and smaller as it recedes further from Earth. So as the phase grows and the apparent size shrinks, there’s a sort of balance point in these opposite trends, when Venus shows overall the greatest apparent illuminated area to Earth, and therefore looks the brightest. Astronomers call it the “Greatest Illuminated Extent,” and Venus reached that point yesterday. It’s still pretty close to it one day later, so here’s another Venus phase update, and be sure to look for Venus, Jupiter, and the Moon to make a spectacular conjunction before dawn the next couple of mornings:
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9:18 AM CDT July 13, 2012 (14:18 UT)
Angular diameter 36.52 arc seconds
27.9% illumination
Distance from Earth 42,450,876 miles (68,318,063 km)
25mm eyepiece with 2x Barlow
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11:56 AM CDT July 3, 2012 (16:56 UT)
Angular diameter 42.79 arc seconds
19.0% illumination
Distance from Earth 36,238,688 miles (58,320,514 km)
25mm eyepiece with 2x Barlow
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11:21 AM CDT June 27, 2012 (16:21 UT)
Angular diameter 47.07 arc seconds
13.4% illumination
Distance from Earth 32,940,927 miles (53,013,283 km)
25mm eyepiece with 2x Barlow
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8:38 AM CDT June 21, 2012 (13:38 UT)
Angular diameter 51.42 arc seconds
7.8% illumination
Distance from Earth 30,154,150 miles (48,528,401 km)
25mm eyepiece with 2x Barlow
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8:57 AM CDT June 12, 2012 (13:57 UT)
Angular diameter 56.46 arc seconds
1.6% illumination
Distance from Earth 27,463,558 miles (44,198,313 km)
25mm eyepiece with 2x Barlow
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7:33 PM CDT June 5, 2012 (00:33 UT June 6, 2012)
Angular diameter 57.78 arc seconds
0.0% illumination, transiting the Sun
Distance from Earth 26,836,379 miles (43,188,966 km)
Projection method with 60mm refractor telescope and 17mm eyepiece
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10:50 AM CDT May 16, 2012 (15:50 UT)
Angular diameter 48.03 arc seconds
12.3% illumination
Distance from Earth 32,284,073 miles (51,956,179 km)
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10:26 AM CDT May 10, 2012 (15:26 UT)
Angular diameter 43.71 arc seconds
18.1% illumination
Distance from Earth 35,473,212 miles (57,088,600 km)
25mm eyepiece with 2x Barlow
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12:41 PM CDT May 3, 2012 (17:41 UT)
Angular diameter 39.11 arc seconds
24.5% illumination
Distance from Earth 39,649,337 miles (63,809,423 km)
18mm eyepiece
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7:14 PM CDT April 22, 2012 (00:14 UT 4-23-12)
Angular diameter 33.12 arc seconds
33.6% illumination
Distance from Earth 46,812,338 miles (75,337,236 km)
25mm eyepiece with 2x Barlow
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6:28 PM CDT March 24, 2012 (23:28 UT)
Angular diameter 22.95 arc seconds
52.4% illumination
Distance from Earth 67,571,683 miles (108,746,083 km)
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4:10 PM CST February 12, 2012 (22:10 UT)
Angular diameter 16.24 arc seconds
70.2% illumination
Distance from Earth 95,450,953 miles (153,613,419 km)
18mm eyepiece
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1:48 PM CST February 8, 2012 (19:48 UT)
Angular diameter 15.82 arc seconds
71.7% illumination
Distance from Earth 98,020,580 miles (157,748,833 km)
18mm eyepiece
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2:37 PM CST January 5, 2012 (20:37 UT)
Angular diameter 13.19 arc seconds
81.6% illumination
Distance from Earth 117,572,894 miles (189,215,232 km)
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2:21 PM CST November 29, 2011 (20:21 UT)
Angular diameter 11.46 arc seconds
89.5% illumination
Distance from Earth 135,265,885 miles (217,689,541 km)
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4:18 PM CST November 20, 2011 (22:18 UT)
Angular diameter 11.13 arc seconds
91.2% illumination
Distance from Earth 139,346,992 miles (227,254,246 km)
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12:03 PM CST January 5, 2011 (18:03 UTC)
Angular diameter 25.58 arc seconds
48.6% illumination
Distance from Earth 60,611,164 miles (97,544,214 km)
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10:02 AM CST November 27, 2010 (16:02 UTC)
Angular diameter 44.72 arc seconds
20.6% illumination
Distance from Earth 34,669,885 miles (55,795,771 km)
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12:40 PM CDT (17:40 UTC), November 5, 2010
Angular diameter 59.94 arc seconds
2.4% illumination
Distance from Earth 25,866,740 miles (41,628,483 km)
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Unless otherwise noted, 8″ reflector telescope, 25mm eyepiece. LG VX8360 cell phone camera.