IOTA/IOTA-ES occultation update for (980) Anacostia / TYC 1866-02528-1 event on 2009 Feb 06, 22:03 UT Visible from Summary ------- On 2009 Feb 06 UT, the 86 km diameter asteroid (980) Anacostia will occult a 11.6 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 12.6 mag (the magnitude of the asteroid) for at most 15.3 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: 2009 Feb 06, 21:51 - 2009 Feb 06, 22:13 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 15.3 * Moon: 90 % sunlit, 14° distance * Sun: 130° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 145 * 1 sigma uncertainty interval [path widths]: +/- 0.44 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .022", 99° ) * approx speed of asteroid's shadow [km/s]: 5.6241 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1866-02528-1 by 980 Anacostia on 2009 Feb 6 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 29 30 42 -53 0 0 22 13 59 0 314 -22 27 57 2 ... .. .. ... .. .. ... .. .. 27 54 5 -52 0 0 22 13 59 2 315 -23 26 27 2 29 25 21 ... .. .. 30 49 44 26 29 28 -51 0 0 22 13 57 3 316 -24 25 7 47 27 54 38 23 58 25 29 12 53 25 14 48 -50 0 0 22 13 54 4 317 -25 23 57 34 26 34 58 22 51 46 27 48 15 24 8 33 -49 0 0 22 13 51 6 318 -26 22 55 6 25 24 32 21 52 21 26 33 44 23 9 35 -48 0 0 22 13 47 7 318 -26 21 59 23 24 22 0 20 59 16 25 27 46 22 16 58 -47 0 0 22 13 42 8 319 -27 21 9 36 23 26 18 20 11 47 24 29 7 21 29 58 -46 0 0 22 13 36 9 320 -28 20 25 5 22 36 38 19 29 19 23 36 53 20 48 0 -45 0 0 22 13 30 10 320 -29 19 45 18 21 52 18 18 51 21 22 50 19 20 10 33 -44 0 0 22 13 23 11 321 -30 19 9 49 21 12 45 18 17 29 22 8 48 19 37 13 -43 0 0 22 13 16 12 321 -31 18 38 14 20 37 33 17 47 21 21 31 51 19 7 37 -42 0 0 22 13 8 13 321 -32 18 10 13 20 6 17 17 20 40 20 59 1 18 41 29 -41 0 0 22 13 0 14 321 -33 17 45 30 19 38 38 16 57 9 20 29 57 18 18 32 -40 0 0 22 12 51 15 322 -34 17 23 51 19 14 19 16 36 35 20 4 22 17 58 33 -39 0 0 22 12 42 16 322 -35 17 5 3 18 53 6 16 18 46 19 42 0 17 41 20 -38 0 0 22 12 32 17 322 -35 16 48 54 18 34 45 16 3 31 19 22 38 17 26 43 -37 0 0 22 12 22 18 322 -36 16 35 15 18 19 7 15 50 42 19 6 3 17 14 32 -36 0 0 22 12 11 19 322 -37 16 23 58 18 6 0 15 40 10 18 52 5 17 4 41 -35 0 0 22 12 0 20 322 -38 16 14 55 17 55 18 15 31 48 18 40 35 16 57 1 -34 0 0 22 11 49 21 322 -39 16 8 0 17 46 51 15 25 31 18 31 26 16 51 26 -33 0 0 22 11 37 22 322 -40 16 3 6 17 40 34 15 21 11 18 24 31 16 47 52 -32 0 0 22 11 24 22 321 -41 16 0 9 17 36 22 15 18 45 18 19 43 16 46 13 -31 0 0 22 11 11 23 321 -42 15 59 3 17 34 8 15 18 8 18 16 58 16 46 25 -30 0 0 22 10 58 24 321 -43 15 59 45 17 33 48 15 19 17 18 16 9 16 48 24 -29 0 0 22 10 44 25 321 -44 16 2 12 17 35 19 15 22 7 18 17 15 16 52 7 -28 0 0 22 10 30 26 320 -45 16 6 20 17 38 37 15 26 36 18 20 10 16 57 32 -27 0 0 22 10 16 26 320 -46 16 12 6 17 43 39 15 32 41 18 24 51 17 4 36 -26 0 0 22 10 1 27 320 -47 16 19 29 17 50 23 15 40 20 18 31 17 17 13 16 -25 0 0 22 9 45 28 319 -48 16 28 26 17 58 47 15 49 32 18 39 25 17 23 32 -24 0 0 22 9 30 28 319 -49 16 38 56 18 8 48 16 0 14 18 49 13 17 35 21 -23 0 0 22 9 14 29 318 -49 16 50 58 18 20 25 16 12 26 19 0 40 17 48 44 -22 0 0 22 8 57 30 318 -50 17 4 30 18 33 38 16 26 7 19 13 44 18 3 39 -21 0 0 22 8 40 30 317 -51 17 19 32 18 48 25 16 41 15 19 28 25 18 20 5 -20 0 0 22 8 23 31 317 -52 17 36 4 19 4 47 16 57 51 19 44 42 18 38 3 -19 0 0 22 8 5 32 316 -53 17 54 5 19 22 43 17 15 54 20 2 36 18 57 33 -18 0 0 22 7 48 32 316 -54 18 13 35 19 42 13 17 35 26 20 22 6 19 18 36 -17 0 0 22 7 29 33 315 -56 18 34 36 20 3 18 17 56 25 20 43 14 19 41 12 -16 0 0 22 7 10 33 314 -57 18 57 7 20 25 59 18 18 53 21 6 0 20 5 22 -15 0 0 22 6 51 34 314 -58 19 21 11 20 50 17 18 42 51 21 30 25 20 31 9 -14 0 0 22 6 32 34 313 -59 19 46 48 21 16 13 19 8 21 21 56 31 20 58 33 -13 0 0 22 6 12 34 312 -60 20 14 1 21 43 51 19 35 24 22 24 21 21 27 38 -12 0 0 22 5 52 35 311 -61 20 42 50 22 13 11 20 4 1 22 53 57 21 58 26 -11 0 0 22 5 31 35 311 -62 21 13 20 22 44 18 20 34 17 23 25 21 22 30 59 -10 0 0 22 5 10 35 310 -63 21 45 33 23 17 14 21 6 12 23 58 39 23 5 23 - 9 0 0 22 4 49 36 309 -64 22 19 32 23 52 4 21 39 51 24 33 53 23 41 41 - 8 0 0 22 4 27 36 308 -65 22 55 22 24 28 51 22 15 18 25 11 9 24 19 57 - 7 0 0 22 4 5 36 307 -66 23 33 7 25 7 42 22 52 37 25 50 32 25 0 19 - 6 0 0 22 3 42 36 306 -67 24 12 53 25 48 43 23 31 52 26 32 10 25 42 52 - 5 0 0 22 3 19 36 305 -69 24 54 45 26 32 0 24 13 11 27 16 9 26 27 45 - 4 0 0 22 2 55 36 304 -70 25 38 50 27 17 43 24 56 38 28 2 39 27 15 5 - 3 0 0 22 2 32 36 303 -71 26 25 18 28 6 0 25 42 23 28 51 49 28 5 3 - 2 0 0 22 2 7 36 303 -72 27 14 17 28 57 3 26 30 33 29 43 54 28 57 52 - 1 0 0 22 1 42 36 302 -73 28 5 59 29 51 5 27 21 19 30 39 6 29 53 46 0 0 0 22 1 17 36 301 -74 29 0 36 30 48 23 28 14 54 31 37 44 30 53 1 1 0 0 22 0 51 36 300 -75 29 58 23 31 49 14 29 11 30 32 40 7 Latitude Latitude Latitude Latitude 31 0 0 1 6 50 22 0 48 36 300 -76 2 0 19 0 11 45 2 46 10 - 0 38 11 32 0 0 2 3 43 22 0 23 35 299 -77 2 55 43 1 10 14 3 40 22 0 21 52 33 0 0 2 57 21 21 59 59 35 298 -78 3 48 2 2 5 20 4 31 35 1 18 20 34 0 0 3 47 59 21 59 35 35 297 -78 4 37 28 2 57 16 5 20 2 2 11 30 35 0 0 4 35 48 21 59 13 34 297 -79 5 24 11 3 46 15 6 5 52 3 1 35 36 0 0 5 20 57 21 58 51 34 296 -80 6 8 21 4 32 27 6 49 13 3 48 48 37 0 0 6 3 35 21 58 30 33 295 -80 6 50 5 5 16 3 7 30 13 4 33 17 38 0 0 6 43 49 21 58 9 33 295 -80 7 29 30 5 57 9 8 8 57 5 15 13 39 0 0 7 21 47 21 57 50 32 294 -81 8 6 43 6 35 55 8 45 32 5 54 43 40 0 0 7 57 33 21 57 30 31 294 -81 8 41 48 7 12 25 9 20 4 6 31 55 41 0 0 8 31 14 21 57 12 31 293 -80 9 14 52 7 46 46 9 52 36 7 6 53 42 0 0 9 2 55 21 56 54 30 293 -80 9 45 58 8 19 3 10 23 13 7 39 43 43 0 0 9 32 38 21 56 37 30 293 -80 10 15 10 8 49 20 10 51 59 8 10 31 44 0 0 10 0 30 21 56 20 29 292 -79 10 42 32 9 17 41 11 18 57 8 39 21 45 0 0 10 26 32 21 56 4 28 292 -79 11 8 8 9 44 11 11 44 11 9 6 17 46 0 0 10 50 48 21 55 48 27 292 -78 11 32 0 10 8 52 12 7 43 9 31 21 47 0 0 11 13 21 21 55 33 27 292 -77 11 54 11 10 31 48 12 29 36 9 54 38 48 0 0 11 34 13 21 55 19 26 292 -76 12 14 44 10 53 0 12 49 51 10 16 9 49 0 0 11 53 26 21 55 5 25 292 -76 12 33 40 11 12 32 13 8 32 10 35 58 50 0 0 12 11 3 21 54 51 25 291 -75 12 51 1 11 30 26 13 25 40 10 54 7 51 0 0 12 27 5 21 54 38 24 291 -74 13 6 49 11 46 42 13 41 17 11 10 37 52 0 0 12 41 34 21 54 25 23 291 -73 13 21 6 12 1 24 13 55 23 11 25 30 53 0 0 12 54 31 21 54 13 22 291 -72 13 33 52 12 14 32 14 8 1 11 38 48 54 0 0 13 5 56 21 54 1 21 291 -71 13 45 9 12 26 7 14 19 10 11 50 31 55 0 0 13 15 52 21 53 50 21 291 -71 13 54 58 12 36 10 14 28 53 12 0 42 56 0 0 13 24 19 21 53 39 20 291 -70 14 3 19 12 44 43 14 37 9 12 9 20 57 0 0 13 31 17 21 53 29 19 292 -69 14 10 13 12 51 45 14 43 59 12 16 26 58 0 0 13 36 47 21 53 19 18 292 -68 14 15 40 12 57 17 14 49 24 12 22 0 59 0 0 13 40 48 21 53 9 17 292 -67 14 19 40 13 1 20 14 53 24 12 26 4 60 0 0 13 43 22 21 53 0 16 292 -66 14 22 14 13 3 52 14 55 59 12 28 36 61 0 0 13 44 27 21 52 52 16 292 -65 14 23 21 13 4 55 14 57 7 12 29 36 62 0 0 13 44 3 21 52 44 15 292 -64 14 23 1 13 4 27 14 56 51 12 29 5 63 0 0 13 42 10 21 52 36 14 292 -63 14 21 14 13 2 29 14 55 7 12 27 1 64 0 0 13 38 47 21 52 28 13 292 -62 14 17 58 12 58 58 14 51 57 12 23 24 65 0 0 13 33 53 21 52 22 12 293 -61 14 13 13 12 53 55 14 47 19 12 18 12 66 0 0 13 27 27 21 52 15 11 293 -60 14 6 57 12 47 18 14 41 12 12 11 25 67 0 0 13 19 27 21 52 9 10 293 -59 13 59 9 12 39 5 14 33 35 12 3 0 68 0 0 13 9 52 21 52 4 9 293 -58 13 49 49 12 29 16 14 24 27 11 52 56 69 0 0 12 58 40 21 51 59 8 293 -57 13 38 53 12 17 47 14 13 44 11 41 12 70 0 0 12 45 49 21 51 54 7 293 -57 13 26 20 12 4 36 14 1 27 11 27 43 71 0 0 12 31 16 21 51 50 6 294 -56 13 12 8 11 49 42 13 47 32 11 12 29 72 0 0 12 14 59 21 51 47 5 294 -55 12 56 13 11 33 0 13 31 56 10 55 25 73 0 0 11 56 54 21 51 44 4 294 -54 12 38 34 11 14 28 13 14 38 10 36 28 74 0 0 11 36 58 21 51 42 3 294 -53 12 19 6 10 54 2 .. .. .. 10 15 34 75 0 0 11 15 6 21 51 40 2 294 -51 11 57 45 10 31 38 .. .. .. 9 52 39 76 0 0 10 51 15 21 51 39 1 295 -50 11 34 29 10 7 11 .. .. .. 9 27 38 77 0 0 10 25 20 21 51 39 0 295 -49 11 9 11 .. .. .. .. .. .. .. .. .. Uncertainty in time = +/- 7 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 1866-02528-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 49 36.7673 DE: +24 22 46.472 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 11.6 * B mag [mag]: 12.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (980) Anacostia approx. diameter [km]: 86 approx. diameter ["]: .057 distance from Earth [AU]: 2.06700 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 567 number of rejected observations: 93 time covered by the observations: 1929 Apr 15 - 2008 Oct 17 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.014, 106° remarks: * orbital elements for (980) Anacostia : Mean anomaly = 84.67978065 deg Arg. of pericenter = 70.01359260 deg Long. of node = 285.89681990 deg Inclination = 15.89860045 deg Eccentricity = 0.19974105 Semimajor axis = 2.74251279 AU Perihelion dist = 2.19472042 AU Mag: H = 7.72, G = 0.06 Epoch of elements : MJD 54868.91900000 TDT (2009 Feb 06.919) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 6 980 Anacostia 22h 2.8m UT 11.6 5 49 36.767 24 22 46.47TYC 1866-02528-1 12.0 12.6 86 15.3 2.067 -0.417 -12.22 -20.4736 24.383 -147.17 -15.35 22.0472 0.72942 -0.34053 -1.34567 -2.87509 0.00456 0.00002 2000 82.7442632009 129.00000 70.013593285.896820 15.8986000.19974105 2.7425128 2.1947204 7.9 5.00.06 RATE 2.1701070 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.022 99 1.44 0.025 0 54776.5020090206_2528-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org