IOTA/IOTA-ES occultation update for (10005) Chernega / HIP 24984 event on 2012 Nov 27, 19:44 UT Visible from New Guinea, India, Africa Summary ------- On 2012 Nov 27 UT, the 10 km diameter asteroid (10005) Chernega will occult a 6.3 mag star in the constellation Taurus for observers along a path across New Guinea, India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 10.5 mag to 16.8 mag (the magnitude of the asteroid) for at most 1.0 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 11 * date and approx. time of event: 2012 Nov 27, 19:34 - 2012 Nov 27, 19:54 UT * geocentric midpoint of event [JD]: 2456259.32268333 * magnitude of target star: 6.3 * magnitude drop [mag]: 10.5 * estimated maximum duration [s]: 1.0 * Moon: 99 % sunlit, 24° distance * Sun: 164° distance * rough path description: New Guinea, India, Africa The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 6.30 * 1 sigma uncertainty interval [seconds]: +/- 10.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .125 +/- .069) * 1 sigma uncertainty ellipse (major, minor, PA): ( .125", .068", 85° ) * approx speed of asteroid's shadow [km/s]: 9.9717 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 24984 by 10005 Chernega on 2012 Nov 27 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 7 0 0 -13 52 12 19 54 47 1 61 -17 -13 48 55 -13 55 29 .. .. .. -14 36 54 - 6 0 0 -13 19 59 19 54 47 2 61 -18 -13 16 42 -13 23 15 .. .. .. -14 4 37 - 5 0 0 -12 47 54 19 54 47 3 60 -19 -12 44 38 -12 51 10 .. .. .. -13 32 28 - 4 0 0 -12 15 58 19 54 46 4 60 -20 -12 12 42 -12 19 14 -11 31 42 -13 0 28 - 3 0 0 -11 44 12 19 54 45 5 60 -21 -11 40 57 -11 47 28 -11 0 0 -12 28 38 - 2 0 0 -11 12 37 19 54 43 6 60 -23 -11 9 22 -11 15 53 -10 28 30 -11 56 58 - 1 0 0 -10 41 14 19 54 42 7 60 -24 -10 38 0 -10 44 29 - 9 57 12 -11 25 30 0 0 0 -10 10 4 19 54 40 8 59 -25 -10 6 49 -10 13 18 - 9 26 6 -10 54 14 1 0 0 - 9 39 7 19 54 38 10 59 -26 - 9 35 53 - 9 42 21 - 8 55 15 -10 23 12 2 0 0 - 9 8 24 19 54 36 11 59 -27 - 9 5 10 - 9 11 38 - 8 24 37 - 9 52 24 3 0 0 - 8 37 56 19 54 33 12 59 -28 - 8 34 43 - 8 41 9 - 7 54 15 - 9 21 51 4 0 0 - 8 7 44 19 54 31 13 59 -29 - 8 4 31 - 8 10 57 - 7 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29 4 21 45 110 0 0 4 45 6 19 39 0 52 311 -41 4 48 5 4 42 8 5 25 28 4 4 35 111 0 0 4 27 33 19 38 51 51 311 -40 4 30 32 4 24 34 5 8 0 3 46 56 112 0 0 4 9 32 19 38 42 50 311 -39 4 12 32 4 6 33 4 50 5 3 28 50 113 0 0 3 51 5 19 38 33 49 310 -38 3 54 4 3 48 5 4 31 42 3 10 17 114 0 0 3 32 9 19 38 24 48 310 -37 3 35 9 3 29 9 4 12 53 2 51 16 115 0 0 3 12 47 19 38 15 48 309 -36 3 15 48 3 9 47 3 53 36 2 31 48 116 0 0 2 52 58 19 38 6 47 309 -35 2 55 59 2 49 57 3 33 53 2 11 54 117 0 0 2 32 43 19 37 58 46 309 -34 2 35 44 2 29 41 3 13 43 1 51 32 118 0 0 2 12 0 19 37 49 45 308 -33 2 15 2 2 8 59 2 53 6 1 30 44 119 0 0 1 50 52 19 37 41 44 308 -32 1 53 54 1 47 50 2 32 3 1 9 29 120 0 0 1 29 17 19 37 32 43 308 -31 1 32 19 1 26 14 2 10 35 0 47 48 121 0 0 1 7 16 19 37 24 42 308 -30 1 10 19 1 4 13 1 48 40 0 25 42 122 0 0 0 44 49 19 37 16 41 307 -29 0 47 53 0 41 46 1 26 19 0 3 9 123 0 0 0 21 57 19 37 8 40 307 -28 0 25 1 0 18 53 1 3 33 - 0 19 49 124 0 0 - 0 1 20 19 37 1 39 307 -27 0 1 44 - 0 4 24 0 40 22 - 0 43 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6 8 17 19 35 30 24 304 -12 - 6 5 7 - 6 11 28 - 5 25 9 - 6 51 38 139 0 0 - 6 37 8 19 35 25 23 304 -11 - 6 33 57 - 6 40 19 - 5 53 54 - 7 20 35 140 0 0 - 7 6 17 19 35 20 22 304 -10 - 7 3 5 - 7 9 29 - 6 22 57 - 7 49 50 141 0 0 - 7 35 43 19 35 15 21 304 -8 - 7 32 31 - 7 38 56 - 6 52 18 - 8 19 22 142 0 0 - 8 5 27 19 35 11 20 304 -7 - 8 2 14 - 8 8 39 - 7 21 55 - 8 49 11 143 0 0 - 8 35 27 19 35 7 19 303 -6 - 8 32 14 - 8 38 39 - 7 51 50 - 9 19 16 144 0 0 - 9 5 42 19 35 3 18 303 -5 - 9 2 28 - 9 8 55 - 8 21 59 - 9 49 37 145 0 0 - 9 36 12 19 34 59 17 303 -4 - 9 32 58 - 9 39 25 - 8 52 24 -10 20 12 146 0 0 -10 6 56 19 34 55 15 303 -3 -10 3 42 -10 10 10 - 9 23 3 -10 51 2 147 0 0 -10 37 53 19 34 52 14 303 -2 -10 34 39 -10 41 8 - 9 53 55 -11 22 4 148 0 0 -11 9 3 19 34 49 13 302 -1 -11 5 48 -11 12 18 -10 25 0 -11 53 19 Uncertainty in time = +/- 12 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: HIP 24984 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 20 59.3232 DE: +27 57 25.972 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .010, .005 ) * V mag [mag]: 6.3 * B mag [mag]: 6.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (10005) Chernega approx. diameter [km]: 10 approx. diameter ["]: .011 distance from Earth [AU]: 1.27300 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: MPC (via Astdys) number of used observations: 783 number of rejected observations: 24 time covered by the observations: 1976 Sep 24 - 2011 Aug 23 1 sigma uncertainty ellipse (major, minor, PA): 0.125, 0.068, 85° remarks: * orbital elements for (10005) Chernega : Mean anomaly = 66.74882336 deg Arg. of pericenter = 322.49269781 deg Long. of node = 21.12119306 deg Inclination = 3.40141978 deg Eccentricity = 0.21265903 Semimajor axis = 2.33399166 AU Perihelion dist = 1.83764727 AU Mag: H = 13.93, G = 0.15 Epoch of elements : MJD 56258.82300000 TDT (2012 Nov 27.823) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 27 10005 Chernega 19h 44.7m UT 6.3 5 20 59.323 27 57 25.97HIP 24984 6.4 16.8 10 1.0 1.273 -2.935 1.30 76.9574 27.956 -119.19 -21.30 19.7444 -0.01132 -0.30842 -5.62517 0.18855 -0.00147 -0.00056 2000 64.31005020121119.00000322.492698 21.121193 3.4014200.21265903 2.3339917 1.837647314.0 5.00.15 RATE 2.7641090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.125 0.068 85 7.30 0.068 0 0 2 2 456247.0020121127__24984 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 03:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org