IOTA/IOTA-ES occultation update for (355) Gabriella / TYC 6906-00598-1 event on 2012 Aug 20, 07:00 UT Visible from Argentina, Chile Summary ------- On 2012 Aug 20 UT, the 25 km diameter asteroid (355) Gabriella will occult a 9.7 mag star in the constellation Capricornus for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 14.2 mag (the magnitude of the asteroid) for at most 2.6 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: 44 * date and approx. time of event: 2012 Aug 20, 06:49 - 2012 Aug 20, 07:09 UT * geocentric midpoint of event [JD]: 2456159.79185 * magnitude of target star: 9.7 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 2.6 * Moon: 9 % sunlit, 119° distance * Sun: 153° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 1.49 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .028", 85° ) * approx speed of asteroid's shadow [km/s]: 9.5771 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6906-00598-1 by 355 Gabriella on 2012 Aug 20 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 157 0 0 -28 0 38 7 9 39 27 104 0 -27 53 3 -28 8 13 -27 30 30 -28 30 50 158 0 0 -28 22 23 7 9 33 28 104 -1 -28 14 49 -28 29 58 -27 52 18 -28 52 33 159 0 0 -28 43 51 7 9 28 29 103 -2 -28 36 18 -28 51 25 -28 13 48 -29 13 58 160 0 0 -29 5 0 7 9 22 30 103 -3 -28 57 28 -29 12 33 -28 35 1 -29 35 5 161 0 0 -29 25 52 7 9 17 31 102 -4 -29 18 20 -29 33 24 -28 55 54 -29 55 53 162 0 0 -29 46 24 7 9 11 32 102 -5 -29 38 53 -29 53 56 -29 16 30 -30 16 23 163 0 0 -30 6 38 7 9 5 33 101 -6 -29 59 8 -30 14 9 -29 36 47 -30 36 35 164 0 0 -30 26 33 7 8 59 34 100 -7 -30 19 3 -30 34 4 -29 56 44 -30 56 27 165 0 0 -30 46 9 7 8 53 35 100 -7 -30 38 40 -30 53 39 -30 16 23 -31 16 0 166 0 0 -31 5 26 7 8 47 35 99 -8 -30 57 58 -31 12 55 -30 35 43 -31 35 14 167 0 0 -31 24 24 7 8 40 36 99 -9 -31 16 56 -31 31 52 -30 54 43 -31 54 9 168 0 0 -31 43 1 7 8 34 37 98 -10 -31 35 34 -31 50 29 -31 13 24 -32 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6 49 35 0 245 -22 -12 13 35 -12 29 2 .. .. .. -12 52 5 Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 6906-00598-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 15 10.8695 DE: -24 15 07.181 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .023 ) * V mag [mag]: 9.7 * B mag [mag]: 11.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (355) Gabriella approx. diameter [km]: 25 approx. diameter ["]: .019 distance from Earth [AU]: 1.81800 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1150 number of rejected observations: 82 time covered by the observations: 1911 Aug 28 - 2012 Jul 01 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.016, 76° remarks: * orbital elements for (355) Gabriella : Mean anomaly = 219.04084862 deg Arg. of pericenter = 106.10163238 deg Long. of node = 351.86990343 deg Inclination = 4.28190823 deg Eccentricity = 0.10643767 Semimajor axis = 2.53734644 AU Perihelion dist = 2.26727718 AU Mag: H = 10.12, G = 0.15 Epoch of elements : MJD 56159.29200000 TDT (2012 Aug 20.292) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 20 355 Gabriella 7h 0.3m UT 9.7 20 15 10.869-24 15 7.18TYC 6906-00598-1 11.3 14.2 25 2.6 1.818 -1.909 -1.06 -130.2934 -24.252 75.77 12.28 7.0044 0.01103 -0.27084 -5.40110 -0.21968 0.00242 0.00094 2000 216.7749342012 811.00000106.101632351.869903 4.2819080.10643767 2.5373464 2.267277210.1 5.00.15 RATE 2.4385650 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.028 85 2.49 0.028 0 0 5-1 456116.0020120820_0598-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 23:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org