IOTA/IOTA-ES occultation update for (876) Scott / TYC 4683-01968-1 event on 2012 Oct 04, 06:47 UT Visible from E Canada, USA, Mexico Summary ------- On 2012 Oct 04 UT, the 27 km diameter asteroid (876) Scott will occult a 11.5 mag star in the constellation Cetus for observers along a path across E Canada, USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 14.6 mag (the magnitude of the asteroid) for at most 2.4 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: 27 * date and approx. time of event: 2012 Oct 04, 06:39 - 2012 Oct 04, 06:55 UT * geocentric midpoint of event [JD]: 2456204.7831 * magnitude of target star: 11.5 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 2.4 * Moon: 85 % sunlit, 45° distance * Sun: 168° distance * rough path description: E Canada, USA, Mexico The occultation path -------------------- * approximate projected width [km]: 33 * 1 sigma uncertainty interval [path widths]: +/- 2.45 * 1 sigma uncertainty interval [seconds]: +/- 6.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .060 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .061", .052", 79° ) * approx speed of asteroid's shadow [km/s]: 11.2150 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4683-01968-1 by 876 Scott on 2012 Oct 4 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 - 33 22 16 71 0 0 6 39 58 3 243 -11 - 34 26 50 - 32 15 52 - 39 21 30 ... .. .. - 39 17 35 70 0 0 6 40 0 5 238 -13 - 40 11 25 - 38 22 44 - 44 22 32 ... .. .. Latitude Latitude Latitude Latitude - 41 0 0 69 40 8 6 40 1 5 236 -14 69 50 29 69 29 49 70 41 32 68 39 37 - 42 0 0 69 27 56 6 40 1 6 235 -14 69 38 21 69 17 32 70 29 45 68 27 0 - 43 0 0 69 15 17 6 40 2 6 234 -15 69 25 46 69 4 50 70 17 32 68 13 57 - 44 0 0 69 2 11 6 40 2 7 233 -15 69 12 45 68 51 40 70 4 52 68 0 26 - 45 0 0 68 48 38 6 40 3 7 233 -15 68 59 16 68 38 2 69 51 46 67 46 28 - 46 0 0 68 34 37 6 40 4 8 232 -16 68 45 19 68 23 56 69 38 11 67 32 0 - 47 0 0 68 20 6 6 40 4 8 231 -16 68 30 53 68 9 21 69 24 9 67 17 3 - 48 0 0 68 5 6 6 40 5 8 230 -17 68 15 57 67 54 16 69 9 36 67 1 36 - 49 0 0 67 49 35 6 40 6 9 229 -17 68 0 31 67 38 40 68 54 34 66 45 37 - 50 0 0 67 33 32 6 40 7 9 228 -18 67 44 34 67 22 33 68 39 1 66 29 7 - 51 0 0 67 16 58 6 40 8 10 227 -18 67 28 4 67 5 53 68 22 56 66 12 5 - 52 0 0 66 59 50 6 40 9 10 226 -19 67 11 1 66 48 41 68 6 18 65 54 29 - 53 0 0 66 42 9 6 40 10 11 225 -19 66 53 25 66 30 54 67 49 7 65 36 18 - 54 0 0 66 23 52 6 40 11 11 224 -20 66 35 14 66 12 33 67 31 21 65 17 33 - 55 0 0 66 5 1 6 40 12 12 223 -20 66 16 27 65 53 36 67 13 1 64 58 12 - 56 0 0 65 45 32 6 40 14 12 222 -21 65 57 4 65 34 3 66 54 3 64 38 14 - 57 0 0 65 25 27 6 40 15 13 221 -21 65 37 3 65 13 52 66 34 29 64 17 39 - 58 0 0 65 4 43 6 40 17 13 220 -22 65 16 25 64 53 3 66 14 17 63 56 25 - 59 0 0 64 43 20 6 40 18 14 220 -22 64 55 7 64 31 35 65 53 26 63 34 32 - 60 0 0 64 21 17 6 40 20 14 219 -23 64 33 9 64 9 27 65 31 54 63 11 59 - 61 0 0 63 58 33 6 40 22 15 218 -23 64 10 31 63 46 38 65 9 42 62 48 46 - 62 0 0 63 35 7 6 40 23 16 217 -24 63 47 10 63 23 7 64 46 48 62 24 50 - 63 0 0 63 10 59 6 40 25 16 216 -25 63 23 7 62 58 54 64 23 12 62 0 13 - 64 0 0 62 46 8 6 40 28 17 215 -25 62 58 21 62 33 57 63 58 52 61 34 52 - 65 0 0 62 20 32 6 40 30 17 214 -26 62 32 51 62 8 16 63 33 47 61 8 47 - 66 0 0 61 54 12 6 40 32 18 213 -26 62 6 35 61 41 51 63 7 57 60 41 58 - 67 0 0 61 27 5 6 40 35 19 212 -27 61 39 34 61 14 40 62 41 21 60 14 23 - 68 0 0 60 59 13 6 40 37 19 211 -28 61 11 46 60 46 42 62 13 58 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Uncertainty in time = +/- 7 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 4683-01968-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 03 42.4935 DE: -06 02 45.431 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .030, .044 ) * V mag [mag]: 11.5 * B mag [mag]: 12.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (876) Scott approx. diameter [km]: 27 approx. diameter ["]: .022 distance from Earth [AU]: 1.70000 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1106 number of rejected observations: 33 time covered by the observations: 1917 Jul 13 - 2012 Aug 28 1 sigma uncertainty ellipse (major, minor, PA): 0.053, 0.028, 76° remarks: * orbital elements for (876) Scott : Mean anomaly = 7.92143669 deg Arg. of pericenter = 211.44730170 deg Long. of node = 151.11932602 deg Inclination = 11.33189982 deg Eccentricity = 0.10894907 Semimajor axis = 3.01061503 AU Perihelion dist = 2.68261133 AU Mag: H = 10.82, G = 0.15 Epoch of elements : MJD 56204.28300000 TDT (2012 Oct 04.283) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 4 876 Scott 6h 47.7m UT 11.5 1 3 42.493- 6 2 45.43TYC 4683-01968-1 12.2 14.6 27 2.4 1.700 -1.743 -19.90 -99.3559 -6.040 75.25 -4.53 6.7944 -0.35115 0.45858 -5.02642 -3.84765 -0.00057 0.00103 2000 7.1133292012 930.00000211.447302151.119326 11.3319000.10894907 3.0106150 2.682611310.9 5.00.15 RATE 1.8867800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.061 0.052 79 3.45 0.054 0 0 5-1 056197.0020121004_1968-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org