IOTA/IOTA-ES occultation update for (1302) Werra / TYC 5822-00001-1 event on 2012 Sep 19, 16:22 UT Visible from Japan, China, India, Africa Summary ------- On 2012 Sep 19 UT, the 32 km diameter asteroid (1302) Werra will occult a 10.0 mag star in the constellation Aquarius for observers along a path across Japan, China, India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 15.1 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: 41 * date and approx. time of event: 2012 Sep 19, 16:15 - 2012 Sep 19, 16:29 UT * geocentric midpoint of event [JD]: 2456190.1823 * magnitude of target star: 10.0 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 2.6 * Moon: 17 % sunlit, 123° distance * Sun: 171° distance * rough path description: Japan, China, India, Africa The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 1.62 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .034", 72° ) * approx speed of asteroid's shadow [km/s]: 12.5277 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5822-00001-1 by 1302 Werra on 2012 Sep 19 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 22 0 0 8 27 27 16 29 40 5 99 -1 8 37 46 8 17 10 9 11 19 7 43 57 23 0 0 8 22 13 16 29 39 6 99 -2 8 32 31 8 11 56 9 6 2 7 38 45 24 0 0 8 17 29 16 29 38 7 99 -3 8 27 47 8 7 13 9 1 16 7 34 3 25 0 0 8 13 15 16 29 36 8 99 -4 8 23 32 8 2 59 8 57 0 7 29 51 26 0 0 8 9 30 16 29 35 9 99 -5 8 19 47 7 59 15 8 53 13 7 26 8 27 0 0 8 6 15 16 29 33 10 99 -6 8 16 32 7 56 0 8 49 57 7 22 55 28 0 0 8 3 30 16 29 31 11 100 -7 8 13 46 7 53 16 8 47 10 7 20 11 29 0 0 8 1 15 16 29 29 12 100 -8 8 11 31 7 51 1 8 44 54 7 17 57 30 0 0 7 59 30 16 29 27 13 100 -9 8 9 45 7 49 15 8 43 7 7 16 12 31 0 0 7 58 14 16 29 24 14 100 -10 8 8 29 7 47 59 8 41 50 7 14 57 32 0 0 7 57 27 16 29 22 15 100 -11 8 7 42 7 47 13 8 41 3 7 14 12 33 0 0 7 57 10 16 29 19 16 100 -12 8 7 25 7 46 56 8 40 46 7 13 55 34 0 0 7 57 23 16 29 16 17 101 -13 8 7 38 7 47 9 8 40 58 7 14 8 35 0 0 7 58 5 16 29 13 18 101 -14 8 8 20 7 47 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Uncertainty in time = +/- 6 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 5822-00001-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 26 32.4377 DE: -07 45 45.400 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .022 ) * V mag [mag]: 10.0 * B mag [mag]: 10.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1302) Werra approx. diameter [km]: 32 approx. diameter ["]: .021 distance from Earth [AU]: 2.05500 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1174 number of rejected observations: 53 time covered by the observations: 1924 Sep 28 - 2012 Aug 10 1 sigma uncertainty ellipse (major, minor, PA): 0.041, 0.026, 67° remarks: * orbital elements for (1302) Werra : Mean anomaly = 286.27308974 deg Arg. of pericenter = 355.42674388 deg Long. of node = 90.16409744 deg Inclination = 2.59727100 deg Eccentricity = 0.17487989 Semimajor axis = 3.11199513 AU Perihelion dist = 2.56776977 AU Mag: H = 10.87, G = 0.15 Epoch of elements : MJD 56189.68200000 TDT (2012 Sep 19.682) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 19 1302 Werra 16h 22.5m UT 10.0 23 26 32.438- 7 45 45.40TYC 5822-00001-1 10.7 15.1 32 2.6 2.055 -1.875 -11.77 107.0308 -7.759 -67.23 1.14 16.3752 -0.20608 0.48802 -6.51368 -2.75156 0.00059 0.00067 2000 284.5348462012 910.00000355.426744 90.164097 2.5972710.17487989 3.1119951 2.567769810.8 5.00.15 RATE 1.7953360 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.034 72 2.62 0.035 0 0-3 0 056165.0020120919_0001-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org