IOTA/IOTA-ES occultation update for (5081) Sanguin / TYC 7381-00284-1 event on 2007 Sep 01, 09:51 UT Visible from Australia Summary ------- On 2007 Sep 01 UT, the 15 km diameter asteroid (5081) Sanguin will occult a 9.3 mag star in the constellation Scorpius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.9 mag to 16.2 mag (the magnitude of the asteroid) for at most 1.5 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: 17 * date and approx. time of event: 2007 Sep 01, 09:42 - 2007 Sep 01, 10:01 UT * midpoint of event [JD]: 2454344.91105 * magnitude of target star: 9.3 * magnitude drop [mag]: 6.9 * estimated maximum duration [s]: 1.5 * Moon: 79 % sunlit, 126° distance * Sun: 108° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 3.93 * 1 sigma uncertainty interval [seconds]: +/- 8.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .086 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .088", .049", 107° ) * approx speed of asteroid's shadow [km/s]: 10.1899 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7381-00284-1 by 5081 Sanguin on 2007 Sep 01 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 66 0 0 21 26 55 9 42 0 1 126 57 21 21 43 21 32 8 .. .. .. 22 13 10 67 0 0 20 46 56 9 42 0 2 126 56 20 41 44 20 52 8 .. .. .. 21 33 11 68 0 0 20 6 45 9 42 1 3 126 56 20 1 33 20 11 58 .. .. .. 20 53 0 69 0 0 19 26 24 9 42 2 4 127 55 19 21 11 19 31 36 18 40 22 20 12 39 70 0 0 18 45 54 9 42 3 5 127 54 18 40 42 18 51 6 17 59 53 19 32 9 71 0 0 18 5 17 9 42 4 6 127 53 18 0 4 18 10 29 17 19 17 18 51 30 72 0 0 17 24 33 9 42 6 8 128 52 17 19 21 17 29 45 16 38 35 18 10 45 73 0 0 16 43 46 9 42 8 9 128 52 16 38 34 16 48 58 15 57 49 17 29 56 74 0 0 16 2 55 9 42 10 10 128 51 15 57 43 16 8 7 15 17 0 16 49 3 75 0 0 15 22 3 9 42 12 11 128 50 15 16 51 15 27 14 14 36 11 16 8 8 76 0 0 14 41 10 9 42 15 12 129 49 14 36 0 14 46 22 13 55 22 15 27 13 77 0 0 14 0 20 9 42 18 13 129 48 13 55 9 14 5 31 13 14 34 14 46 19 78 0 0 13 19 32 9 42 21 15 129 47 13 14 22 13 24 43 12 33 51 14 5 27 79 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- 2 17 51 10 1 5 21 236 -80 - 2 22 38 - 2 13 4 - 3 0 12 - 1 35 19 -157 0 0 - 1 46 22 10 1 10 20 236 -81 - 1 51 10 - 1 41 33 - 2 28 52 - 1 3 41 -156 0 0 - 1 14 21 10 1 14 19 236 -81 - 1 19 10 - 1 9 31 - 1 56 59 - 0 31 32 -155 0 0 - 0 41 49 10 1 18 18 236 -81 - 0 46 39 - 0 36 59 - 1 24 36 0 1 9 -154 0 0 - 0 8 47 10 1 22 17 236 -81 - 0 13 38 - 0 3 55 - 0 51 42 0 34 20 -153 0 0 0 24 45 10 1 26 16 236 -81 0 19 53 0 29 38 - 0 18 19 1 8 1 -152 0 0 0 58 46 10 1 29 14 236 -81 0 53 53 1 3 39 0 15 33 1 42 10 -151 0 0 1 33 14 10 1 32 13 236 -80 1 28 20 1 38 9 0 49 53 2 16 47 -150 0 0 2 8 10 10 1 35 12 236 -80 2 3 15 2 13 5 1 24 40 2 51 51 -149 0 0 2 43 31 10 1 38 11 236 -79 2 38 35 2 48 28 1 59 54 3 27 21 -148 0 0 3 19 18 10 1 41 10 236 -78 3 14 21 3 24 15 2 35 33 4 3 15 -147 0 0 3 55 29 10 1 43 9 236 -77 3 50 31 4 0 27 3 11 36 4 39 34 -146 0 0 4 32 3 10 1 45 7 236 -76 4 27 4 4 37 2 3 48 2 5 16 16 -145 0 0 5 8 59 10 1 46 6 236 -75 5 3 59 5 13 58 4 24 50 5 53 19 -144 0 0 5 46 15 10 1 48 5 237 -75 5 41 15 5 51 16 5 2 0 6 30 43 -143 0 0 6 23 52 10 1 49 4 237 -74 6 18 51 6 28 53 5 39 29 7 8 27 -142 0 0 7 1 47 10 1 49 3 237 -73 6 56 45 7 6 49 .. .. .. 7 46 29 -141 0 0 7 39 59 10 1 50 2 237 -71 7 34 56 7 45 2 .. .. .. 8 24 47 -140 0 0 8 18 27 10 1 50 0 237 -70 8 13 24 8 23 31 .. .. .. 9 3 22 Data for the target star ------------------------ * name: TYC 7381-00284-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 45 17.6442 DE: -32 30 36.013 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .018 ) * V mag [mag]: 9.3 * B mag [mag]: 10.4 * Apparent position with proper motion RA(deg): 266.4531020728 DE(deg): -32.5160893410 * Equation of equinoxes (radians) : 0.000031755830332 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5081) Sanguin approx. diameter [km]: 15 approx. diameter ["]: .013 distance from Earth [AU]: 1.58500 * orbital information: orbit source: Preston date of fit: 2007 Jul 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 571 number of rejected observations: 2 time covered by the observations: 1968 Apr 26 - 2007 May 19 1 sigma uncertainty ellipse (major, minor, PA): 0.086, 0.046, 108° remarks: * orbital elements for (5081) Sanguin : Mean anomaly = 39.21140880 deg Arg. of pericenter = 162.68445281 deg Long. of node = 83.35575737 deg Inclination = 13.18755509 deg Eccentricity = 0.11406677 Semimajor axis = 2.31890073 AU Perihelion dist = 2.05439123 AU Mag: H = 12.40, G = 0.15 Epoch of elements : MJD 54344.41100000 TDT (2007 Sep 01.411) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 01 5081 Sanguin 9h 51.9m UT 9.3 17 45 17.644-32 30 36.01TYC 7381-00284-1 10.4 16.2 15 1.5 1.585 2.499 -4.41 138.160 -32.508 32.06 8.34 9.8652 .04233 .30641 5.69613 -0.79579 0.00499 0.00014 2000 37.98023932007 828.00000162.684453 83.355757 13.1875550.114066772.318900732.0543912312.45 0.15 RATE 2.7911350 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.088 0.049 107.0 4.930 0.051 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 05, 22:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org