IOTA/IOTA-ES occultation update for (980) Anacostia / TYC 1733-00066-1 event on 2012 Nov 27, 15:16 UT Visible from Africa Summary ------- On 2012 Nov 27 UT, the 78 km diameter asteroid (980) Anacostia will occult a 12.1 mag star in the constellation Andromeda for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 11.7 mag (the magnitude of the asteroid) for at most 9.3 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: 95 * date and approx. time of event: 2012 Nov 27, 15:11 - 2012 Nov 27, 15:26 UT * geocentric midpoint of event [JD]: 2456259.13580417 * magnitude of target star: 12.1 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 9.3 * Moon: 99 % sunlit, 45° distance * Sun: 126° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .025", 75° ) * approx speed of asteroid's shadow [km/s]: 8.4614 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1733-00066-1 by 980 Anacostia 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 ' " Longitude Longitude Longitude Longitude 83 21 39 -62 0 0 15 26 33 0 345 0 82 29 29 84 13 47 81 44 37 84 58 38 82 47 32 -61 0 0 15 26 33 1 345 -1 81 57 2 83 38 1 81 13 35 84 21 26 82 14 23 -60 0 0 15 26 32 3 346 -2 81 25 25 83 3 19 80 43 17 83 45 24 81 42 5 -59 0 0 15 26 32 4 346 -2 80 54 33 82 29 36 80 13 38 83 10 27 81 10 34 -58 0 0 15 26 31 5 347 -3 80 24 21 81 56 44 79 44 35 82 36 26 80 39 43 -57 0 0 15 26 29 6 347 -3 79 54 45 81 24 40 79 16 3 82 3 17 80 9 30 -56 0 0 15 26 28 7 348 -4 79 25 42 80 53 17 78 47 59 81 30 54 79 39 51 -55 0 0 15 26 26 8 348 -4 78 57 7 80 22 32 78 20 20 80 59 13 79 10 41 -54 0 0 15 26 23 9 349 -5 78 28 59 79 52 22 77 53 4 80 28 10 78 41 59 -53 0 0 15 26 21 10 349 -6 78 1 13 79 22 42 77 26 8 79 57 41 78 13 41 -52 0 0 15 26 18 11 349 -6 77 33 49 78 53 30 76 59 29 79 27 43 77 45 45 -51 0 0 15 26 15 12 350 -7 77 6 43 78 24 43 76 33 7 78 58 12 77 18 8 -50 0 0 15 26 12 13 350 -7 76 39 54 77 56 18 76 6 58 78 29 6 76 50 48 -49 0 0 15 26 8 14 351 -8 76 13 19 77 28 14 75 41 2 78 0 23 76 23 44 -48 0 0 15 26 4 15 351 -8 75 46 57 77 0 27 75 15 16 77 32 0 75 56 53 -47 0 0 15 26 0 16 351 -9 75 20 46 76 32 57 74 49 39 77 3 55 75 30 14 -46 0 0 15 25 56 17 352 -9 74 54 45 76 5 40 74 24 10 76 36 6 75 3 45 -45 0 0 15 25 51 18 352 -10 74 28 51 75 38 36 73 58 47 76 8 32 74 37 25 -44 0 0 15 25 46 19 352 -10 74 3 5 75 11 43 73 33 30 75 41 9 74 11 13 -43 0 0 15 25 41 20 353 -10 73 37 24 74 44 58 73 8 16 75 13 58 73 45 6 -42 0 0 15 25 35 21 353 -11 73 11 47 74 18 22 72 43 5 74 46 55 73 19 4 -41 0 0 15 25 30 22 354 -11 72 46 13 73 51 51 72 17 55 74 20 1 72 53 6 -40 0 0 15 25 24 23 354 -12 72 20 41 73 25 26 71 52 46 73 53 12 72 27 9 -39 0 0 15 25 17 24 354 -12 71 55 10 72 59 5 71 27 36 73 26 29 72 1 14 -38 0 0 15 25 11 25 355 -12 71 29 38 72 32 46 71 2 25 72 59 50 71 35 18 -37 0 0 15 25 4 26 355 -13 71 4 5 72 6 28 70 37 11 72 33 13 71 9 22 -36 0 0 15 24 57 27 356 -13 70 38 30 71 40 10 70 11 54 72 6 37 70 43 23 -35 0 0 15 24 49 28 356 -13 70 12 51 71 13 52 69 46 32 71 40 1 70 17 21 -34 0 0 15 24 41 29 357 -14 69 47 8 70 47 31 69 21 4 71 13 24 69 51 15 -33 0 0 15 24 33 30 357 -14 69 21 19 70 21 7 68 55 30 70 46 45 69 25 3 -32 0 0 15 24 25 31 357 -14 68 55 23 69 54 39 68 29 49 70 20 3 68 58 45 -31 0 0 15 24 17 32 358 -15 68 29 21 69 28 6 68 4 0 69 53 16 68 32 20 -30 0 0 15 24 8 33 358 -15 68 3 10 69 1 26 67 38 1 69 26 24 68 5 46 -29 0 0 15 23 59 34 359 -15 67 36 49 68 34 39 67 11 51 68 59 25 67 39 3 -28 0 0 15 23 50 35 359 -15 67 10 18 68 7 43 66 45 31 68 32 19 67 12 9 -27 0 0 15 23 40 36 360 -15 66 43 35 67 40 37 66 18 58 68 5 3 66 45 3 -26 0 0 15 23 30 37 1 -16 66 16 40 67 13 21 65 52 12 67 37 38 66 17 45 -25 0 0 15 23 20 38 1 -16 65 49 32 66 45 53 65 25 11 67 10 2 65 50 13 -24 0 0 15 23 10 39 2 -16 65 22 8 66 18 13 64 57 56 66 42 13 65 22 26 -23 0 0 15 23 0 40 2 -16 64 54 29 65 50 18 64 30 23 66 14 12 64 54 23 -22 0 0 15 22 49 41 3 -16 64 26 33 65 22 8 64 2 33 65 45 55 64 26 3 -21 0 0 15 22 38 42 4 -16 63 58 19 64 53 41 63 34 24 65 17 23 63 57 24 -20 0 0 15 22 26 43 4 -16 63 29 45 64 24 57 63 5 55 64 48 34 63 28 25 -19 0 0 15 22 15 44 5 -16 63 0 51 63 55 54 62 37 4 64 19 27 62 59 5 -18 0 0 15 22 3 45 6 -17 62 31 35 63 26 30 62 7 51 63 50 1 62 29 23 -17 0 0 15 21 51 46 7 -17 62 1 56 62 56 45 61 38 14 63 20 13 61 59 17 -16 0 0 15 21 39 47 8 -17 61 31 52 62 26 37 61 8 12 62 50 3 61 28 46 -15 0 0 15 21 26 48 8 -17 61 1 22 61 56 5 60 37 42 62 19 30 60 57 48 -14 0 0 15 21 14 49 9 -17 60 30 24 61 25 6 60 6 44 61 48 31 60 26 22 -13 0 0 15 21 1 50 10 -17 59 58 56 60 53 40 59 35 16 61 17 5 59 54 25 -12 0 0 15 20 48 51 11 -16 59 26 58 60 21 45 59 3 17 60 45 11 59 21 56 -11 0 0 15 20 34 51 12 -16 58 54 27 59 49 19 58 30 43 60 12 46 58 48 54 -10 0 0 15 20 20 52 14 -16 58 21 22 59 16 20 57 57 35 59 39 50 58 15 16 - 9 0 0 15 20 7 53 15 -16 57 47 39 58 42 46 57 23 48 59 6 19 57 41 0 - 8 0 0 15 19 52 54 16 -16 57 13 18 58 8 35 56 49 22 58 32 12 57 6 4 - 7 0 0 15 19 38 55 17 -16 56 38 16 57 33 45 56 14 14 57 57 27 56 30 26 - 6 0 0 15 19 23 55 19 -16 56 2 30 56 58 14 55 38 22 57 22 2 55 54 3 - 5 0 0 15 19 9 56 20 -15 55 25 58 56 21 59 55 1 43 56 45 54 55 16 52 - 4 0 0 15 18 54 57 22 -15 54 48 38 55 44 58 54 24 14 56 9 1 54 38 51 - 3 0 0 15 18 38 57 23 -15 54 10 27 55 7 7 53 45 53 55 31 19 53 59 57 - 2 0 0 15 18 23 58 25 -15 53 31 20 54 28 25 53 6 36 54 52 46 53 20 6 - 1 0 0 15 18 7 59 27 -14 52 51 16 53 48 47 52 26 19 54 13 20 52 39 15 0 0 0 15 17 51 59 29 -14 52 10 10 53 8 11 51 45 0 53 32 55 51 57 21 1 0 0 15 17 35 60 31 -14 51 27 58 52 26 32 51 2 34 52 51 30 Latitude Latitude Latitude Latitude 50 0 0 3 39 46 15 16 51 61 36 -13 3 0 3 4 19 5 2 25 33 4 52 35 49 0 0 4 56 56 15 16 29 61 39 -12 4 18 6 5 35 23 3 44 23 6 8 10 48 0 0 6 11 9 15 16 7 61 42 -12 5 33 10 6 48 47 5 0 11 7 20 53 47 0 0 7 22 31 15 15 46 61 45 -11 6 45 20 7 59 22 6 13 3 8 30 48 46 0 0 8 31 7 15 15 26 61 47 -10 7 54 41 9 7 13 7 23 5 9 38 2 45 0 0 9 37 1 15 15 6 61 50 -10 9 1 18 10 12 26 8 30 21 10 42 39 44 0 0 10 40 20 15 14 46 61 53 -9 10 5 19 11 15 5 9 34 57 11 44 44 43 0 0 11 41 9 15 14 27 61 55 -8 11 6 46 12 15 15 10 36 59 12 44 22 42 0 0 12 39 32 15 14 8 61 57 -8 12 5 46 13 13 2 11 36 31 13 41 39 41 0 0 13 35 35 15 13 50 60 59 -7 13 2 24 14 8 30 12 33 40 14 36 38 40 0 0 14 29 22 15 13 32 60 61 -6 13 56 44 15 1 45 13 28 30 15 29 25 39 0 0 15 20 58 15 13 15 59 63 -6 14 48 52 15 52 50 14 21 5 16 20 4 38 0 0 16 10 27 15 12 58 59 65 -5 15 38 52 16 41 49 15 11 31 17 8 38 37 0 0 16 57 54 15 12 41 58 66 -4 16 26 47 17 28 48 15 59 52 17 55 14 36 0 0 17 43 23 15 12 25 57 68 -4 17 12 43 18 13 50 16 46 11 18 39 53 35 0 0 18 26 57 15 12 10 57 69 -3 17 56 44 18 57 0 17 30 34 19 22 41 34 0 0 19 8 41 15 11 55 56 70 -2 18 38 52 19 38 20 18 13 4 20 3 40 33 0 0 19 48 38 15 11 40 55 71 -2 19 19 13 20 17 54 18 53 45 20 42 55 32 0 0 20 26 52 15 11 25 54 72 -1 19 57 48 20 55 46 19 32 40 21 20 29 31 0 0 21 3 26 15 11 11 54 73 0 20 34 43 21 31 58 20 9 53 21 56 24 Uncertainty in time = +/- 4 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1733-00066-1 * constellation : Andromeda * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 19 33.3618 DE: +26 36 42.987 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .021 ) * V mag [mag]: 12.1 * B mag [mag]: 12.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (980) Anacostia approx. diameter [km]: 78 approx. diameter ["]: .069 distance from Earth [AU]: 1.54800 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 716 number of rejected observations: 94 time covered by the observations: 1929 Apr 15 - 2012 Oct 28 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.013, 62° remarks: * orbital elements for (980) Anacostia : Mean anomaly = 25.96184536 deg Arg. of pericenter = 70.37057350 deg Long. of node = 285.85042831 deg Inclination = 15.89892192 deg Eccentricity = 0.20007728 Semimajor axis = 2.74171528 AU Perihelion dist = 2.19316034 AU Mag: H = 7.73, G = 0.06 Epoch of elements : MJD 56258.63600000 TDT (2012 Nov 27.636) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 27 980 Anacostia 15h 15.6m UT 12.1 0 19 33.362 26 36 42.99TYC 1733-00066-1 12.8 11.7 78 9.3 1.548 1.206 -21.79 69.0597 26.618 -51.93 -21.27 15.2593 -0.38452 -0.28495 2.84378 -3.83690 0.00451 0.00061 2000 24.08692320121119.00000 70.370573285.850428 15.8989220.20007728 2.7417153 2.1931603 7.9 5.00.06 RATE 2.1710540 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.025 75 1.43 0.030 0 0-2-3 056247.0020121127_0066-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org