IOTA/IOTA-ES occultation update for (980) Anacostia / TYC 2283-00241-1 event on 2012 Oct 01, 06:47 UT Visible from E Canada, USA Summary ------- On 2012 Oct 01 UT, the 78 km diameter asteroid (980) Anacostia will occult a 12.6 mag star in the constellation Andromeda for observers along a path across E Canada, USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.2 mag to 11.0 mag (the magnitude of the asteroid) for at most 10.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 98 * date and approx. time of event: 2012 Oct 01, 06:33 - 2012 Oct 01, 07:00 UT * geocentric midpoint of event [JD]: 2456201.78214167 * magnitude of target star: 12.6 * magnitude drop [mag]: 0.2 * estimated maximum duration [s]: 10.4 * Moon: 99 % sunlit, 25° distance * Sun: 148° distance * rough path description: E Canada, USA The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .030", 73° ) * approx speed of asteroid's shadow [km/s]: 7.5319 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2283-00241-1 by 980 Anacostia on 2012 Oct 1 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 166 0 0 0 42 52 7 0 6 1 55 -4 1 9 9 0 16 38 1 28 6 - 0 2 14 167 0 0 1 25 33 7 0 5 2 55 -5 1 51 54 0 59 16 2 10 53 0 40 21 168 0 0 2 8 31 7 0 4 4 55 -6 2 34 55 1 42 10 2 53 57 1 23 13 169 0 0 2 51 45 7 0 3 5 55 -7 3 18 12 2 25 20 3 37 16 2 6 21 170 0 0 3 35 11 7 0 1 6 55 -8 4 1 41 3 8 44 4 20 48 2 49 42 171 0 0 4 18 50 6 59 59 7 55 -9 4 45 23 3 52 19 5 4 31 3 33 16 172 0 0 5 2 39 6 59 57 9 55 -10 5 29 14 4 36 6 5 48 25 4 17 0 173 0 0 5 46 36 6 59 54 10 55 -11 6 13 14 5 20 1 6 32 26 5 0 54 174 0 0 6 30 41 6 59 50 11 56 -12 6 57 21 6 4 4 7 16 35 5 44 55 175 0 0 7 14 51 6 59 47 12 56 -13 7 41 33 6 48 12 8 0 48 6 29 2 176 0 0 7 59 5 6 59 42 13 56 -14 8 25 49 7 32 24 8 45 5 7 13 13 177 0 0 8 43 21 6 59 38 15 56 -15 9 10 6 8 16 39 9 29 24 7 57 27 178 0 0 9 27 38 6 59 33 16 56 -16 9 54 24 9 0 55 10 13 42 8 41 42 179 0 0 10 11 54 6 59 28 17 56 -17 10 38 41 9 45 9 10 58 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-13 37 35 52 36 46 56 37 53 32 36 29 21 - 24 0 0 36 44 46 6 34 33 31 293 -12 37 9 21 36 20 13 37 27 4 36 2 33 - 23 0 0 36 17 32 6 34 26 30 293 -11 36 42 13 35 52 54 37 0 1 35 35 10 - 22 0 0 35 49 43 6 34 19 29 294 -11 36 14 30 35 24 59 36 32 21 35 7 11 - 21 0 0 35 21 17 6 34 12 28 295 -10 35 46 10 34 56 27 36 4 6 34 38 36 - 20 0 0 34 52 15 6 34 6 27 295 -9 35 17 13 34 27 20 35 35 13 34 9 24 - 19 0 0 34 22 37 6 33 59 26 296 -8 34 47 41 33 57 36 35 5 45 33 39 36 - 18 0 0 33 52 22 6 33 53 26 296 -8 34 17 31 33 27 15 34 35 40 33 9 11 - 17 0 0 33 21 30 6 33 47 25 297 -7 33 46 45 32 56 18 34 4 58 32 38 10 - 16 0 0 32 50 2 6 33 41 24 298 -6 33 15 23 32 24 44 33 33 39 32 6 32 - 15 0 0 32 17 57 6 33 35 23 298 -5 32 43 24 31 52 34 33 1 44 31 34 18 - 14 0 0 31 45 16 6 33 29 22 299 -4 32 10 48 31 19 47 32 29 12 31 1 27 - 13 0 0 31 11 58 6 33 24 21 299 -3 31 37 36 30 46 23 31 56 4 30 28 0 - 12 0 0 30 38 4 6 33 19 20 300 -3 31 3 47 30 12 24 31 22 20 29 53 57 - 11 0 0 30 3 34 6 33 14 19 300 -2 30 29 22 29 37 49 30 47 59 29 19 17 - 10 0 0 29 28 28 6 33 9 18 301 -1 29 54 22 29 2 37 30 13 2 28 44 2 Uncertainty in time = +/- 5 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 2283-00241-1 * constellation : Andromeda * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 41 09.8708 DE: +34 53 16.485 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .025 ) * V mag [mag]: 12.6 * B mag [mag]: 12.9 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (980) Anacostia approx. diameter [km]: 78 approx. diameter ["]: .083 distance from Earth [AU]: 1.30200 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 701 number of rejected observations: 93 time covered by the observations: 1929 Apr 15 - 2012 Sep 03 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.016, 68° remarks: * orbital elements for (980) Anacostia : Mean anomaly = 13.52340304 deg Arg. of pericenter = 70.35237514 deg Long. of node = 285.85314696 deg Inclination = 15.89877493 deg Eccentricity = 0.19999428 Semimajor axis = 2.74139012 AU Perihelion dist = 2.19312776 AU Mag: H = 7.72, G = 0.06 Epoch of elements : MJD 56201.28300000 TDT (2012 Oct 01.283) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 1 980 Anacostia 6h 46.3m UT 12.6 0 41 9.871 34 53 16.49TYC 2283-00241-1 12.9 11.0 78 10.4 1.302 -2.287 -5.81 -101.6887 34.890 75.83 -3.37 6.7714 -0.04102 0.19784 -4.16400 -0.85658 -0.00026 -0.00284 2000 13.2448072012 930.00000 70.352375285.853147 15.8987750.19999428 2.7413901 2.1931278 7.9 5.00.06 RATE 2.1714400 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.030 73 1.36 0.030 0 0-2-5 056197.0020121001_0241-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org