IOTA/IOTA-ES occultation update for (9) Metis / TYC 6836-00359-1 event on 2007 Sep 18, 23:16 UT Visible from N Brazil Summary ------- On 2007 Sep 18 UT, the 210 km diameter asteroid (9) Metis will occult a 9.2 mag star in the constellation Sagittarius for observers along a path across N Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 11.3 mag (the magnitude of the asteroid) for at most 14.0 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: 99 * date and approx. time of event: 2007 Sep 18, 23:10 - 2007 Sep 18, 23:23 UT * magnitude of target star: 9.2 * magnitude drop [mag]: 2.3 * estimated maximum duration [s]: 14.0 * Moon: 42 % sunlit, 11° distance * Sun: 92° distance * rough path description: N Brazil The occultation path -------------------- * approximate projected width [km]: 230 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .020", 91° ) * approx speed of asteroid's shadow [km/s]: 14.9618 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6836-00359-1 by 9 Metis on 2007 Sep 18 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 -156 0 0 20 51 48 23 10 2 0 120 67 19 40 57 .. .. .. 19 18 26 .. .. .. -155 0 0 20 19 48 23 10 2 1 120 67 19 9 1 21 31 18 18 46 31 21 54 20 -154 0 0 19 47 49 23 10 2 2 120 67 18 37 7 20 59 14 18 14 38 21 22 15 -153 0 0 19 15 54 23 10 2 3 121 67 18 5 17 20 27 14 17 42 50 20 50 13 -152 0 0 18 44 3 23 10 3 4 121 66 17 33 32 19 55 17 17 11 6 20 18 15 -151 0 0 18 12 17 23 10 4 6 121 66 17 1 52 19 23 26 16 39 28 19 46 21 -150 0 0 17 40 38 23 10 5 7 122 65 16 30 19 18 51 40 16 7 57 19 14 33 -149 0 0 17 9 6 23 10 6 8 122 65 15 58 53 18 20 1 15 36 33 18 42 52 -148 0 0 16 37 42 23 10 7 9 122 65 15 27 36 17 48 30 15 5 18 18 11 19 -147 0 0 16 6 27 23 10 8 10 123 64 14 56 28 17 17 8 14 34 12 17 39 54 -146 0 0 15 35 22 23 10 10 11 123 63 14 25 30 16 45 56 14 3 17 17 8 40 -145 0 0 15 4 28 23 10 12 12 123 63 13 54 44 16 14 54 13 32 33 16 37 35 -144 0 0 14 33 47 23 10 14 13 123 62 13 24 10 15 44 4 13 2 2 16 6 43 -143 0 0 14 3 18 23 10 16 14 124 61 12 53 49 15 13 27 12 31 44 15 36 3 -142 0 0 13 33 2 23 10 18 15 124 61 12 23 42 14 43 3 12 1 39 15 5 36 -141 0 0 13 3 2 23 10 21 16 124 60 11 53 50 14 12 53 11 31 50 14 35 24 -140 0 0 12 33 17 23 10 23 18 124 59 11 24 14 13 42 59 11 2 17 14 5 27 -139 0 0 12 3 48 23 10 26 19 125 58 10 54 54 13 13 21 10 33 0 13 35 46 -138 0 0 11 34 36 23 10 29 20 125 58 10 25 52 12 44 1 10 4 0 13 6 22 -137 0 0 11 5 43 23 10 32 21 125 57 9 57 8 12 14 57 9 35 19 12 37 16 -136 0 0 10 37 8 23 10 35 22 126 56 9 28 42 11 46 13 9 6 56 12 8 28 -135 0 0 10 8 53 23 10 39 23 126 55 9 0 37 11 17 48 8 38 54 11 40 0 -134 0 0 9 40 58 23 10 42 24 126 54 8 32 51 10 49 43 8 11 11 11 11 52 -133 0 0 9 13 24 23 10 46 25 126 53 8 5 27 10 21 59 7 43 50 10 44 4 -132 0 0 8 46 12 23 10 50 26 127 52 7 38 25 9 54 37 7 16 51 10 16 39 -131 0 0 8 19 22 23 10 54 27 127 51 7 11 45 9 27 37 6 50 14 9 49 35 -130 0 0 7 52 55 23 10 58 28 127 50 6 45 28 9 1 0 6 24 1 9 22 55 -129 0 0 7 26 52 23 11 2 29 127 50 6 19 35 8 34 46 5 58 11 8 56 38 -128 0 0 7 1 13 23 11 7 31 128 49 5 54 6 8 8 57 5 32 45 8 30 46 -127 0 0 6 35 59 23 11 12 32 128 48 5 29 2 7 43 33 5 7 44 8 5 18 -126 0 0 6 11 10 23 11 16 33 128 47 5 4 24 7 18 34 4 43 9 7 40 16 -125 0 0 5 46 48 23 11 21 34 129 46 4 40 11 6 54 1 4 18 59 7 15 39 -124 0 0 5 22 51 23 11 26 35 129 45 4 16 25 6 29 54 3 55 16 6 51 30 -123 0 0 4 59 22 23 11 31 36 129 44 3 53 5 6 6 15 3 32 0 6 27 47 -122 0 0 4 36 20 23 11 36 37 130 43 3 30 14 5 43 3 3 9 11 6 4 31 -121 0 0 4 13 46 23 11 42 38 130 42 3 7 49 5 20 19 2 46 50 5 41 44 -120 0 0 3 51 41 23 11 47 39 130 41 2 45 53 4 58 3 2 24 57 5 19 25 -119 0 0 3 30 4 23 11 53 40 131 40 2 24 26 4 36 16 2 3 33 4 57 35 -118 0 0 3 8 56 23 11 59 41 131 39 2 3 28 4 14 58 1 42 38 4 36 14 -117 0 0 2 48 17 23 12 4 42 132 38 1 42 59 3 54 10 1 22 12 4 15 23 -116 0 0 2 28 8 23 12 10 43 132 37 1 22 59 3 33 52 1 2 15 3 55 1 -115 0 0 2 8 30 23 12 16 44 132 35 1 3 30 3 14 4 0 42 49 3 35 10 -114 0 0 1 49 22 23 12 22 45 133 34 0 44 31 2 54 46 0 23 52 3 15 50 -113 0 0 1 30 44 23 12 28 46 133 33 0 26 2 2 35 59 0 5 26 2 57 0 -112 0 0 1 12 37 23 12 35 47 134 32 0 8 4 2 17 44 - 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Data for the target star ------------------------ * name: TYC 6836-00359-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 49 19.6618 DE: -27 28 29.643 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .018 ) * V mag [mag]: 9.2 * B mag [mag]: 9.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9) Metis approx. diameter [km]: 210 approx. diameter ["]: .122 distance from Earth [AU]: 2.37300 * orbital information: orbit source: Preston date of fit: 2007 Sep 11 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1719 number of rejected observations: 185 time covered by the observations: 1903 Mar 22 - 2007 Aug 25 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.007, 100° remarks: * orbital elements for (9) Metis : Mean anomaly = 224.02819171 deg Arg. of pericenter = 6.13361639 deg Long. of node = 68.96883513 deg Inclination = 5.57524563 deg Eccentricity = 0.12164080 Semimajor axis = 2.38695895 AU Perihelion dist = 2.09660735 AU Mag: H = 6.21, G = 0.17 Epoch of elements : MJD 54361.97000000 TDT (2007 Sep 18.970) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 18 9 Metis 23h 16.5m UT 9.2 17 49 19.662-27 28 29.64TYC 6836-00359-1 9.3 11.3 210 14.0 2.373 2.352 0.14 -79.288 -27.475 -170.60 1.72 23.2752 -.00299 .40437 8.44476 0.03799 0.00563 -0.00009 2000 223.5016862007 917.00000 6.133616 68.968835 5.5752460.121640802.386958952.096607356.285 0.17 RATE 2.6726170 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.022 0.020 91.3 1.160 0.020 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 12, 00:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org