IOTA/IOTA-ES occultation update for (550) Senta / TYC 1752-02072-1 event on 2012 Oct 27, 01:59 UT Visible from SE Canada, E USA, Mexico Summary ------- On 2012 Oct 27 UT, the 41 km diameter asteroid (550) Senta will occult a 12.4 mag star in the constellation Pisces for observers along a path across SE Canada, E USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.4 mag (the magnitude of the asteroid) for at most 3.9 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: 71 * date and approx. time of event: 2012 Oct 27, 01:49 - 2012 Oct 27, 02:07 UT * geocentric midpoint of event [JD]: 2456227.5824875 * magnitude of target star: 12.4 * magnitude drop [mag]: 0.8 * estimated maximum duration [s]: 3.9 * Moon: 93 % sunlit, 31° distance * Sun: 165° distance * rough path description: SE Canada, E USA, Mexico The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .032", 79° ) * approx speed of asteroid's shadow [km/s]: 10.3571 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1752-02072-1 by 550 Senta on 2012 Oct 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 -124 18 43 - 6 0 0 2 7 53 6 63 0 -124 43 45 -123 53 54 -125 24 47 -123 14 7 -122 35 58 - 5 0 0 2 7 50 7 63 -2 -123 0 7 -122 11 59 -123 39 40 -121 33 31 -120 57 38 - 4 0 0 2 7 47 9 63 -4 -121 21 2 -120 34 24 -121 59 19 -119 57 5 -119 23 13 - 3 0 0 2 7 43 11 63 -6 -119 45 58 -119 0 37 -120 23 8 -118 24 18 -117 52 16 - 2 0 0 2 7 38 13 63 -7 -118 14 26 -117 30 14 -118 50 38 -116 54 48 -116 24 24 - 1 0 0 2 7 33 15 63 -9 -116 46 4 -116 2 52 -117 21 25 -115 28 13 -114 59 19 0 0 0 2 7 27 16 63 -11 -115 20 32 -114 38 13 -115 55 7 -114 4 15 -113 36 44 1 0 0 2 7 21 18 63 -12 -113 57 33 -113 16 2 -114 31 28 -112 42 41 Latitude Latitude Latitude Latitude -113 0 0 1 27 15 2 7 19 19 63 -13 1 42 38 1 11 54 2 7 39 0 47 7 -112 0 0 2 12 28 2 7 14 20 63 -14 2 27 58 1 57 0 2 53 10 1 32 3 -111 0 0 2 58 34 2 7 8 21 63 -15 3 14 11 2 43 0 3 39 34 2 17 52 -110 0 0 3 45 34 2 7 3 22 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41 67 8 56 65 53 27 63 0 0 66 16 26 1 50 18 19 292 -10 66 30 58 66 1 57 66 54 34 65 38 33 64 0 0 66 1 16 1 50 16 18 293 -9 66 15 54 65 46 40 66 39 41 65 23 7 65 0 0 65 45 32 1 50 14 18 293 -9 66 0 17 65 30 51 66 24 14 65 7 7 66 0 0 65 29 15 1 50 12 18 294 -9 65 44 6 65 14 27 66 8 14 64 50 33 67 0 0 65 12 23 1 50 11 17 295 -8 65 27 20 64 57 28 65 51 40 64 33 23 68 0 0 64 54 55 1 50 9 17 296 -8 65 9 59 64 39 53 65 34 29 64 15 37 69 0 0 64 36 50 1 50 7 16 297 -7 64 52 1 64 21 41 65 16 43 63 57 14 70 0 0 64 18 6 1 50 5 15 298 -7 64 33 25 64 2 50 64 58 18 63 38 12 71 0 0 63 58 44 1 50 3 15 299 -6 64 14 9 63 43 21 64 39 15 63 18 31 72 0 0 63 38 41 1 50 2 14 300 -6 63 54 14 63 23 11 64 19 32 62 58 9 73 0 0 63 17 57 1 50 0 14 301 -5 63 33 37 63 2 19 63 59 7 62 37 5 74 0 0 62 56 29 1 49 58 13 302 -5 63 12 18 62 40 44 63 38 0 62 15 18 75 0 0 62 34 18 1 49 57 13 303 -4 62 50 15 62 18 25 63 16 10 61 52 47 76 0 0 62 11 22 1 49 55 12 304 -3 62 27 26 61 55 21 62 53 34 61 29 31 77 0 0 61 47 39 1 49 54 11 304 -3 62 3 51 61 31 31 62 30 13 61 5 27 78 0 0 61 23 9 1 49 52 11 305 -2 61 39 29 61 6 52 62 6 3 60 40 36 79 0 0 60 57 49 1 49 51 10 306 -2 61 14 17 60 41 24 61 41 5 60 14 55 80 0 0 60 31 39 1 49 49 10 307 -1 60 48 15 60 15 6 61 15 17 59 48 24 81 0 0 60 4 37 1 49 48 9 308 0 60 21 22 59 47 56 60 48 37 59 21 1 Uncertainty in time = +/- 4 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 1752-02072-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 36 38.6391 DE: +25 59 18.055 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .028 ) * V mag [mag]: 12.4 * B mag [mag]: 12.9 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (550) Senta approx. diameter [km]: 41 approx. diameter ["]: .041 distance from Earth [AU]: 1.37300 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 930 number of rejected observations: 76 time covered by the observations: 1900 Dec 20 - 2012 Oct 01 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.016, 74° remarks: * orbital elements for (550) Senta : Mean anomaly = 53.36088598 deg Arg. of pericenter = 44.79465709 deg Long. of node = 270.77412807 deg Inclination = 10.11409474 deg Eccentricity = 0.21985399 Semimajor axis = 2.58987467 AU Perihelion dist = 2.02048039 AU Mag: H = 9.20, G = 0.15 Epoch of elements : MJD 56227.08300000 TDT (2012 Oct 27.083) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 27 550 Senta 1h 58.8m UT 12.4 1 36 38.639 25 59 18.06TYC 1752-02072-1 13.0 12.4 41 3.9 1.373 -2.232 -22.29 -41.3742 25.995 146.28 -12.87 1.9797 -0.26978 0.36445 -4.69845 -3.47829 0.00073 -0.00125 2000 51.68593120121020.00000 44.794657270.774128 10.1140950.21985399 2.5898747 2.0204804 9.4 5.00.15 RATE 2.3647540 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.032 79 1.81 0.034 0 0 1-5 056208.0020121027_2072-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org