IOTA/IOTA-ES occultation update for (845) Naema / TYC 2393-01344-1 event on 2012 Nov 23, 01:36 UT Visible from Russia, Northern Canada Summary ------- On 2012 Nov 23 UT, the 61 km diameter asteroid (845) Naema will occult a 10.9 mag star in the constellation Auriga for observers along a path across Russia, Northern Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 14.1 mag (the magnitude of the asteroid) for at most 4.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 82 * date and approx. time of event: 2012 Nov 23, 01:30 - 2012 Nov 23, 01:42 UT * geocentric midpoint of event [JD]: 2456254.56700833 * magnitude of target star: 10.9 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 4.8 * Moon: 74 % sunlit, 79° distance * Sun: 159° distance * rough path description: Russia, Northern Canada The occultation path -------------------- * approximate projected width [km]: 81 * 1 sigma uncertainty interval [path widths]: +/- 0.65 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .027", 82° ) * approx speed of asteroid's shadow [km/s]: 12.6636 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2393-01344-1 by 845 Naema on 2012 Nov 23 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 -139 0 0 45 55 12 1 42 46 1 41 -2 46 29 8 45 21 43 47 13 58 .. .. .. -138 0 0 46 44 40 1 42 46 2 42 -3 47 18 45 46 11 2 48 3 46 .. .. .. -137 0 0 47 33 43 1 42 45 3 42 -3 48 7 56 46 59 57 48 53 9 46 16 43 -136 0 0 48 22 18 1 42 44 4 43 -4 48 56 39 47 48 25 49 42 2 47 5 2 -135 0 0 49 10 23 1 42 43 5 44 -5 49 44 51 48 36 24 50 30 23 47 52 53 -134 0 0 49 57 56 1 42 42 6 45 -6 50 32 29 49 23 51 51 18 10 48 40 14 -133 0 0 50 44 54 1 42 41 7 46 -7 51 19 32 50 10 44 52 5 20 49 27 1 -132 0 0 51 31 15 1 42 39 8 46 -8 52 5 57 50 57 1 52 51 51 50 13 13 -131 0 0 52 16 57 1 42 37 9 47 -9 52 51 43 51 42 40 53 37 40 50 58 48 -130 0 0 53 1 57 1 42 36 10 48 -10 53 36 46 52 27 38 54 22 47 51 43 43 -129 0 0 53 46 15 1 42 34 11 49 -11 54 21 5 53 11 55 55 7 9 52 27 58 -128 0 0 54 29 48 1 42 31 12 50 -11 55 4 39 53 55 27 55 50 43 53 11 30 -127 0 0 55 12 35 1 42 29 13 50 -12 55 47 26 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253 -27 62 10 0 61 2 38 62 54 49 60 19 49 45 0 0 61 2 19 1 34 40 46 255 -26 61 36 21 60 28 45 62 21 21 59 45 46 46 0 0 60 27 42 1 34 34 45 256 -26 61 1 52 59 54 1 61 47 2 59 10 54 47 0 0 59 52 16 1 34 27 45 258 -25 60 26 32 59 18 28 61 11 50 58 35 14 48 0 0 59 15 59 1 34 21 45 260 -25 59 50 21 58 42 6 60 35 47 57 58 45 49 0 0 58 38 53 1 34 14 44 261 -25 59 13 20 58 4 56 59 58 52 57 21 29 50 0 0 58 0 58 1 34 7 44 263 -24 58 35 28 57 26 57 59 21 6 56 43 25 51 0 0 57 22 15 1 34 1 43 264 -23 57 56 48 56 48 11 58 42 30 56 4 36 52 0 0 56 42 44 1 33 54 43 265 -23 57 17 20 56 8 38 58 3 5 55 25 0 53 0 0 56 2 27 1 33 47 42 267 -22 56 37 4 55 28 20 57 22 51 54 44 40 54 0 0 55 21 24 1 33 40 42 268 -22 55 56 2 54 47 17 56 41 49 54 3 36 55 0 0 54 39 38 1 33 33 41 270 -21 55 14 14 54 5 30 56 0 1 53 21 51 56 0 0 53 57 8 1 33 26 41 271 -20 54 31 43 53 23 2 55 17 28 52 39 24 57 0 0 53 13 57 1 33 19 40 273 -20 53 48 30 52 39 53 54 34 12 51 56 17 58 0 0 52 30 6 1 33 12 40 274 -19 53 4 36 51 56 5 53 50 13 51 12 33 59 0 0 51 45 37 1 33 5 39 275 -18 52 20 3 51 11 40 53 5 35 50 28 13 60 0 0 51 0 32 1 32 58 38 277 -18 51 34 54 50 26 40 52 20 19 49 43 18 61 0 0 50 14 53 1 32 51 38 278 -17 50 49 9 49 41 6 51 34 27 48 57 51 62 0 0 49 28 42 1 32 44 37 279 -16 50 2 52 48 55 1 50 48 0 48 11 53 63 0 0 48 42 1 1 32 37 36 280 -15 49 16 3 48 8 27 50 1 2 47 25 27 64 0 0 47 54 52 1 32 30 35 281 -15 48 28 47 47 21 25 49 13 35 46 38 35 65 0 0 47 7 18 1 32 23 34 283 -14 47 41 4 46 33 59 48 25 41 45 51 19 66 0 0 46 19 21 1 32 16 34 284 -13 46 52 58 45 46 11 47 37 22 45 3 42 67 0 0 45 31 4 1 32 9 33 285 -12 46 4 31 44 58 3 46 48 42 44 15 45 68 0 0 44 42 28 1 32 2 32 286 -11 45 15 45 44 9 37 45 59 42 43 27 31 69 0 0 43 53 37 1 31 56 31 287 -10 44 26 43 43 20 56 45 10 25 42 39 3 70 0 0 43 4 33 1 31 49 30 288 -9 43 37 28 42 32 3 44 20 55 41 50 23 71 0 0 42 15 18 1 31 43 29 289 -8 42 48 2 41 43 0 43 31 13 41 1 34 72 0 0 41 25 56 1 31 37 28 290 -7 41 58 27 40 53 49 42 41 22 40 12 38 73 0 0 40 36 29 1 31 31 27 291 -6 41 8 48 40 4 34 41 51 25 39 23 37 74 0 0 39 46 59 1 31 25 26 292 -5 40 19 5 39 15 16 41 1 25 38 34 35 75 0 0 38 57 29 1 31 19 25 293 -4 39 29 22 38 25 58 40 11 24 37 45 32 76 0 0 38 8 1 1 31 14 24 293 -3 38 39 41 37 36 43 39 21 25 36 56 33 77 0 0 37 18 38 1 31 8 23 294 -2 37 50 4 36 47 33 38 31 30 36 7 40 78 0 0 36 29 22 1 31 3 22 295 -1 37 0 35 35 58 31 37 41 43 35 18 54 79 0 0 35 40 16 1 30 58 21 296 0 36 11 15 35 9 38 36 52 4 34 30 18 Uncertainty in time = +/- 4 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 2393-01344-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 11 32.3398 DE: +32 29 07.442 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .022 ) * V mag [mag]: 10.9 * B mag [mag]: 12.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (845) Naema approx. diameter [km]: 61 approx. diameter ["]: .042 distance from Earth [AU]: 2.00100 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 879 number of rejected observations: 65 time covered by the observations: 1916 Nov 16 - 2012 Nov 08 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.015, 75° remarks: * orbital elements for (845) Naema : Mean anomaly = 86.60054152 deg Arg. of pericenter = 296.52724212 deg Long. of node = 43.25938187 deg Inclination = 12.62038290 deg Eccentricity = 0.06707277 Semimajor axis = 2.94347672 AU Perihelion dist = 2.74604958 AU Mag: H = 10.14, G = 0.15 Epoch of elements : MJD 56254.06700000 TDT (2012 Nov 23.067) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 23 845 Naema 1h 36.5m UT 10.9 5 11 32.340 32 29 7.44TYC 2393-01344-1 12.2 14.1 61 4.8 2.001 -2.391 8.47 -8.6748 32.484 152.48 -20.39 1.6082 0.17796 0.63666 -6.88249 1.92885 -0.00179 -0.00108 2000 85.80678520121119.00000296.527242 43.259382 12.6203830.06707277 2.9434767 2.7460496 9.7 5.00.15 RATE 1.9517010 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.027 82 1.65 0.027 0 0-2 2 056247.0020121123_1344-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org