IOTA/IOTA-ES occultation update for (169) Zelia / TYC 2422-00156-1 event on 2008 Jan 07, 01:41 UT Visible from Brazil, Bolivia Summary ------- On 2008 Jan 07 UT, the 34 km diameter asteroid (169) Zelia will occult a 8.6 mag star in the constellation Auriga for observers along a path across Brazil, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 mag to 13.0 mag (the magnitude of the asteroid) for at most 2.8 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: 73 * date and approx. time of event: 2008 Jan 07, 01:34 - 2008 Jan 07, 01:47 UT * magnitude of target star: 8.6 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 2.8 * Moon: 2 % sunlit, 172° distance * Sun: 167° distance * rough path description: Brazil, Bolivia The occultation path -------------------- * approximate projected width [km]: 47 * 1 sigma uncertainty interval [path widths]: +/- 0.79 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .024", 93° ) * approx speed of asteroid's shadow [km/s]: 11.9672 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2422-00156-1 by 169 Zelia on 2008 Jan 07 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 - 96 0 0 -38 9 1 1 47 33 0 48 0 -37 51 31 .. .. .. .. .. .. .. .. .. - 95 0 0 -37 26 14 1 47 32 1 47 -1 -37 8 52 -37 43 43 .. .. .. -38 11 36 - 94 0 0 -36 43 44 1 47 32 2 47 -2 -36 26 29 -37 1 5 .. .. .. -37 28 46 - 93 0 0 -36 1 32 1 47 31 3 46 -4 -35 44 24 -36 18 46 .. .. .. -36 46 14 - 92 0 0 -35 19 41 1 47 31 4 46 -5 -35 2 41 -35 36 47 -34 36 2 -36 4 3 - 91 0 0 -34 38 12 1 47 29 5 45 -6 -34 21 19 -34 55 11 -33 54 51 -35 22 15 - 90 0 0 -33 57 6 1 47 28 6 44 -7 -33 40 21 -34 13 58 -33 14 5 -34 40 49 - 89 0 0 -33 16 26 1 47 26 8 44 -8 -32 59 48 -33 33 10 -32 33 43 -33 59 49 - 88 0 0 -32 36 12 1 47 24 9 43 -9 -32 19 41 -32 52 49 -31 53 48 -33 19 16 - 87 0 0 -31 56 26 1 47 22 10 43 -10 -31 40 3 -32 12 56 -31 14 21 -32 39 11 - 86 0 0 -31 17 10 1 47 20 11 42 -11 -31 0 54 -31 33 32 -30 35 23 -31 59 35 - 85 0 0 -30 38 24 1 47 17 12 42 -12 -30 22 15 -30 54 39 -29 56 55 -31 20 30 - 84 0 0 -30 0 10 1 47 14 13 41 -13 -29 44 7 -30 16 17 -29 18 58 -30 41 57 - 83 0 0 -29 22 28 1 47 11 14 41 -14 -29 6 33 -29 38 28 -28 41 34 -30 3 57 - 82 0 0 -28 45 20 1 47 8 15 40 -15 -28 29 31 -29 1 13 -28 4 44 -29 26 30 - 81 0 0 -28 8 46 1 47 4 16 39 -16 -27 53 5 -28 24 33 -27 28 28 -28 49 39 - 80 0 0 -27 32 48 1 47 0 17 39 -17 -27 17 13 -27 48 28 -26 52 46 -28 13 23 - 79 0 0 -26 57 26 1 46 56 18 38 -18 -26 41 58 -27 12 59 -26 17 41 -27 37 44 - 78 0 0 -26 22 41 1 46 52 19 38 -19 -26 7 20 -26 38 8 -25 43 13 -27 2 42 - 77 0 0 -25 48 34 1 46 48 20 37 -20 -25 33 19 -26 3 54 -25 9 22 -26 28 18 - 76 0 0 -25 15 5 1 46 43 21 37 -22 -24 59 56 -25 30 19 -24 36 9 -25 54 32 - 75 0 0 -24 42 15 1 46 38 22 36 -23 -24 27 12 -24 57 23 -24 3 34 -25 21 26 - 74 0 0 -24 10 4 1 46 33 23 36 -24 -23 55 7 -24 25 6 -23 31 38 -24 49 0 - 73 0 0 -23 38 33 1 46 28 24 35 -25 -23 23 42 -23 53 29 -23 0 22 -24 17 13 - 72 0 0 -23 7 43 1 46 22 25 34 -26 -22 52 57 -23 22 33 -22 29 46 -23 46 8 - 71 0 0 -22 37 33 1 46 17 26 34 -27 -22 22 52 -22 52 17 -21 59 50 -23 15 43 - 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28 0 0 -12 9 59 1 40 37 46 353 -55 -11 57 10 -12 22 51 -11 37 0 -12 43 16 - 27 0 0 -12 10 59 1 40 28 46 352 -55 -11 58 10 -12 23 51 -11 38 0 -12 44 17 - 26 0 0 -12 12 41 1 40 19 45 351 -55 -11 59 52 -12 25 34 -11 39 41 -12 46 0 - 25 0 0 -12 15 6 1 40 11 45 350 -55 -12 2 16 -12 27 59 -11 42 5 -12 48 26 - 24 0 0 -12 18 13 1 40 2 45 349 -55 -12 5 23 -12 31 7 -11 45 11 -12 51 35 - 23 0 0 -12 22 3 1 39 53 45 348 -55 -12 9 12 -12 34 57 -11 48 59 -12 55 26 - 22 0 0 -12 26 35 1 39 45 44 347 -55 -12 13 43 -12 39 30 -11 53 29 -13 0 0 - 21 0 0 -12 31 49 1 39 36 44 346 -55 -12 18 56 -12 44 45 -11 58 41 -13 5 17 - 20 0 0 -12 37 46 1 39 28 44 345 -55 -12 24 52 -12 50 43 -12 4 35 -13 11 17 - 19 0 0 -12 44 26 1 39 19 43 343 -55 -12 31 31 -12 57 24 -12 11 11 -13 17 59 - 18 0 0 -12 51 48 1 39 11 43 342 -54 -12 38 51 -13 4 47 -12 18 30 -13 25 25 - 17 0 0 -12 59 52 1 39 2 43 341 -54 -12 46 55 -13 12 53 -12 26 31 -13 33 33 - 16 0 0 -13 8 40 1 38 54 42 340 -54 -12 55 40 -13 21 42 -12 35 15 -13 42 24 - 15 0 0 -13 18 10 1 38 46 42 340 -53 -13 5 9 -13 31 14 -12 44 40 -13 51 59 - 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Data for the target star ------------------------ * name: TYC 2422-00156-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 30 37.7295 DE: +31 52 21.855 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .015, .017 ) * V mag [mag]: 8.6 * B mag [mag]: 9.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (169) Zelia approx. diameter [km]: 34 approx. diameter ["]: .030 distance from Earth [AU]: 1.56500 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 730 number of rejected observations: 103 time covered by the observations: 1907 Mar 04 - 2007 Dec 16 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 94° remarks: * orbital elements for (169) Zelia : Mean anomaly = 118.43445774 deg Arg. of pericenter = 334.77478533 deg Long. of node = 354.81236191 deg Inclination = 5.50168992 deg Eccentricity = 0.13094308 Semimajor axis = 2.35842289 AU Perihelion dist = 2.04960373 AU Mag: H = 9.30, G = 0.15 Epoch of elements : MJD 54472.07000000 TDT (2008 Jan 07.070) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 07 169 Zelia 1h 41.2m UT 8.6 6 30 37.729 31 52 21.86TYC 2422-00156-1 9.8 13.0 34 2.8 1.565 -2.976 -1.57 -33.648 31.872 156.18 -22.47 1.6862 .02849 -.69434 -6.74884 -0.27908 0.00091 -0.00092 2000 117.8711552008 1 5.00000334.774785354.812362 5.5016900.130943082.358422892.049603739.565 0.15 RATE 2.7212690 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.027 0.024 92.8 1.790 0.024 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org