IOTA/IOTA-ES occultation update for (1200) Imperatrix / TYC 1234-00611-1 event on 2012 Nov 10, 06:08 UT Visible from W Africa, SE USA, Mexico Summary ------- On 2012 Nov 10 UT, the 44 km diameter asteroid (1200) Imperatrix will occult a 8.5 mag star in the constellation Taurus for observers along a path across W Africa, SE USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.8 mag to 15.3 mag (the magnitude of the asteroid) for at most 3.0 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: 49 * date and approx. time of event: 2012 Nov 10, 06:01 - 2012 Nov 10, 06:16 UT * geocentric midpoint of event [JD]: 2456241.7563 * magnitude of target star: 8.5 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 3.0 * Moon: 18 % sunlit, 122° distance * Sun: 172° distance * rough path description: W Africa, SE USA, Mexico The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 1.32 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .033", 83° ) * approx speed of asteroid's shadow [km/s]: 14.6167 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1234-00611-1 by 1200 Imperatrix on 2012 Nov 10 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 -177 0 0 - 7 41 44 6 16 14 1 74 -8 - 7 29 6 - 7 54 22 - 6 55 42 - 8 27 40 -176 0 0 - 7 23 47 6 16 13 2 73 -9 - 7 11 7 - 7 36 26 - 6 37 40 - 8 9 47 -175 0 0 - 7 5 28 6 16 13 3 73 -10 - 6 52 47 - 7 18 8 - 6 19 16 - 7 51 32 -174 0 0 - 6 46 47 6 16 13 4 73 -11 - 6 34 5 - 6 59 28 - 6 0 31 - 7 32 56 -173 0 0 - 6 27 45 6 16 12 5 73 -12 - 6 15 2 - 6 40 28 - 5 41 25 - 7 13 59 -172 0 0 - 6 8 23 6 16 11 6 73 -13 - 5 55 38 - 6 21 7 - 5 21 58 - 6 54 41 -171 0 0 - 5 48 40 6 16 10 7 73 -14 - 5 35 54 - 6 1 25 - 5 2 10 - 6 35 2 -170 0 0 - 5 28 37 6 16 9 8 73 -15 - 5 15 50 - 5 41 23 - 4 42 3 - 6 15 4 -169 0 0 - 5 8 14 6 16 8 9 73 -17 - 4 55 26 - 5 21 1 - 4 21 35 - 5 54 45 -168 0 0 - 4 47 31 6 16 7 10 73 -18 - 4 34 42 - 5 0 20 - 4 0 49 - 5 34 7 -167 0 0 - 4 26 30 6 16 5 11 73 -19 - 4 13 39 - 4 39 20 - 3 39 43 - 5 13 10 -166 0 0 - 4 5 10 6 16 4 12 72 -20 - 3 52 18 - 4 18 1 - 3 18 18 - 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9 0 0 32 35 51 6 2 19 19 277 -13 32 48 10 32 23 32 33 20 45 31 51 3 - 8 0 0 32 25 47 6 2 17 18 278 -12 32 38 8 32 13 27 33 10 45 31 40 56 - 7 0 0 32 15 22 6 2 15 17 279 -11 32 27 43 32 3 1 33 0 23 31 30 27 - 6 0 0 32 4 35 6 2 13 16 279 -10 32 16 57 31 52 13 32 49 40 31 19 36 - 5 0 0 31 53 26 6 2 12 16 280 -9 32 5 49 31 41 3 32 38 34 31 8 23 - 4 0 0 31 41 54 6 2 10 15 280 -8 31 54 19 31 29 30 32 27 7 30 56 48 - 3 0 0 31 30 1 6 2 8 14 281 -8 31 42 27 31 17 36 32 15 17 30 44 51 - 2 0 0 31 17 46 6 2 7 13 281 -7 31 30 12 31 5 20 32 3 6 30 32 32 - 1 0 0 31 5 8 6 2 5 12 282 -6 31 17 36 30 52 41 31 50 33 30 19 50 0 0 0 30 52 9 6 2 4 11 282 -5 31 4 38 30 39 40 31 37 38 30 6 46 1 0 0 30 38 47 6 2 2 10 283 -4 30 51 17 30 26 17 31 24 20 29 53 20 2 0 0 30 25 3 6 2 1 9 283 -3 30 37 35 30 12 33 31 10 41 29 39 32 3 0 0 30 10 58 6 2 0 8 284 -2 30 23 30 29 58 26 30 56 39 29 25 22 4 0 0 29 56 30 6 1 59 8 284 -1 30 9 4 29 43 56 30 42 16 29 10 50 5 0 0 29 41 40 6 1 58 7 285 -1 29 54 15 29 29 5 30 27 31 28 55 55 Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 1234-00611-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 34 49.2259 DE: +16 07 38.133 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 8.5 * B mag [mag]: 9.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1200) Imperatrix approx. diameter [km]: 44 approx. diameter ["]: .025 distance from Earth [AU]: 2.38400 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1099 number of rejected observations: 58 time covered by the observations: 1913 Mar 08 - 2012 Sep 26 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.023, 80° remarks: * orbital elements for (1200) Imperatrix : Mean anomaly = 155.40292142 deg Arg. of pericenter = 48.04054356 deg Long. of node = 205.30901076 deg Inclination = 4.60534059 deg Eccentricity = 0.10577131 Semimajor axis = 3.06776615 AU Perihelion dist = 2.74328450 AU Mag: H = 10.82, G = 0.15 Epoch of elements : MJD 56241.25600000 TDT (2012 Nov 10.256) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 10 1200 Imperatrix 6h 9.1m UT 8.5 3 34 49.226 16 7 38.13TYC 1234-00611-1 9.0 15.3 44 3.0 2.384 -2.003 -9.64 -88.3729 16.130 83.72 -17.26 6.1512 -0.05668 0.16961 -7.82499 -2.61410 -0.00084 0.00013 2000 155.172533201211 9.00000 48.040544205.309011 4.6053410.10577131 3.0677662 2.743284510.5 5.00.15 RATE 1.8343010 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.033 83 2.32 0.034 0 0-1 3 056208.0020121110_0611-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 20:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org