IOTA/IOTA-ES occultation update for (1619) Ueta / TYC 1875-00021-1 event on 2008 Jan 01, 17:13 UT Visible from China, India, Arabia, Africa Summary ------- On 2008 Jan 01 UT, the 13 km diameter asteroid (1619) Ueta will occult a 10.2 mag star in the constellation Auriga for observers along a path across China, India, Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 14.2 mag (the magnitude of the asteroid) for at most 1.6 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: 30 * date and approx. time of event: 2008 Jan 01, 16:59 - 2008 Jan 01, 17:26 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 1.6 * Moon: 36 % sunlit, 118° distance * Sun: 167° distance * rough path description: China, India, Arabia, Africa The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 2.22 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .053 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .053", .037", 84° ) * approx speed of asteroid's shadow [km/s]: 7.9974 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1875-00021-1 by 1619 Ueta on 2008 Jan 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 - 5 0 0 4 20 20 17 26 13 0 60 11 4 24 26 4 16 14 4 42 37 3 58 2 - 4 0 0 4 54 57 17 26 13 2 60 10 4 59 2 4 50 52 5 17 11 4 32 42 - 3 0 0 5 29 14 17 26 13 3 60 9 5 33 19 5 25 9 5 51 25 5 7 2 - 2 0 0 6 3 11 17 26 12 4 60 8 6 7 15 5 59 7 6 25 19 5 41 2 - 1 0 0 6 36 47 17 26 10 5 60 7 6 40 51 6 32 44 6 58 52 6 14 42 0 0 0 7 10 2 17 26 9 6 60 6 7 14 5 7 5 59 7 32 3 6 47 59 1 0 0 7 42 54 17 26 7 7 61 5 7 46 56 7 38 51 8 4 52 7 20 54 2 0 0 8 15 23 17 26 5 8 61 3 8 19 25 8 11 21 8 37 18 7 53 27 3 0 0 8 47 28 17 26 2 10 61 2 8 51 29 8 43 27 9 9 20 8 25 35 4 0 0 9 19 9 17 26 0 11 61 1 9 23 10 9 15 8 9 40 57 8 57 20 5 0 0 9 50 25 17 25 57 12 61 0 9 54 25 9 46 25 10 12 10 9 28 39 6 0 0 10 21 16 17 25 53 13 61 -1 10 25 16 10 17 17 10 42 58 9 59 34 7 0 0 10 51 41 17 25 50 14 62 -2 10 55 40 10 47 43 11 13 19 10 30 2 8 0 0 11 21 40 17 25 46 15 62 -3 11 25 38 11 17 42 11 43 15 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- 6 23 1 - 6 31 18 - 6 4 38 - 6 49 42 168 0 0 - 7 3 18 16 59 55 10 302 -22 - 6 59 9 - 7 7 26 - 6 40 46 - 7 25 50 169 0 0 - 7 39 24 16 59 53 9 302 -21 - 7 35 15 - 7 43 32 - 7 16 52 - 8 1 56 170 0 0 - 8 15 26 16 59 50 7 302 -20 - 8 11 17 - 8 19 35 - 7 52 55 - 8 37 59 171 0 0 - 8 51 24 16 59 49 6 302 -19 - 8 47 15 - 8 55 32 - 8 28 53 - 9 13 56 172 0 0 - 9 27 16 16 59 47 5 302 -18 - 9 23 8 - 9 31 24 - 9 4 45 - 9 49 48 173 0 0 -10 3 2 16 59 46 4 301 -17 - 9 58 53 -10 7 10 - 9 40 31 -10 25 33 174 0 0 -10 38 39 16 59 45 3 301 -15 -10 34 31 -10 42 47 -10 16 10 -11 1 10 175 0 0 -11 14 8 16 59 44 2 301 -14 -11 10 0 -11 18 16 -10 51 39 -11 36 37 176 0 0 -11 49 26 16 59 44 1 301 -13 -11 45 19 -11 53 34 -11 26 59 -12 11 55 Data for the target star ------------------------ * name: TYC 1875-00021-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 56 28.7977 DE: +29 59 32.263 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .016 ) * V mag [mag]: 10.2 * B mag [mag]: 10.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1619) Ueta approx. diameter [km]: 13 approx. diameter ["]: .017 distance from Earth [AU]: 1.05200 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 693 number of rejected observations: 38 time covered by the observations: 1931 Jan 11 - 2007 Dec 18 1 sigma uncertainty ellipse (major, minor, PA): 0.051, 0.033, 83° remarks: * orbital elements for (1619) Ueta : Mean anomaly = 47.82999289 deg Arg. of pericenter = 328.22210645 deg Long. of node = 61.59873246 deg Inclination = 6.21350406 deg Eccentricity = 0.17578580 Semimajor axis = 2.24120483 AU Perihelion dist = 1.84723283 AU Mag: H = 12.16, G = 0.15 Epoch of elements : MJD 54466.71700000 TDT (2008 Jan 01.717) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 01 1619 Ueta 17h 13.0m UT 10.2 5 56 28.798 29 59 32.26TYC 1875-00021-1 10.6 14.2 13 1.6 1.052 -2.865 6.11 -269.861 29.990 -77.38 -23.01 17.2163 -.01325 -.07941 -4.45423 0.73170 0.00106 -0.00061 2000 45.856856620071226.00000328.222106 61.598732 6.2135040.175785802.241204831.8472328312.15 0.15 RATE 2.9375262 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.053 0.037 83.6 3.220 0.038 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 03:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org