IOTA/IOTA-ES occultation update for (178) Belisana / TYC 0026-01061-1 event on 2008 Oct 18, 02:15 UT Visible from Argentina, Chile Summary ------- On 2008 Oct 18 UT, the 36 km diameter asteroid (178) Belisana will occult a 11.8 mag star in the constellation Pisces for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 12.5 mag (the magnitude of the asteroid) for at most 3.2 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: 63 * date and approx. time of event: 2008 Oct 18, 02:08 - 2008 Oct 18, 02:23 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 3.2 * Moon: 85 % sunlit, 51° distance * Sun: 175° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.96 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .032", 80° ) * approx speed of asteroid's shadow [km/s]: 11.1513 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0026-01061-1 by 178 Belisana on 2008 Oct 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 -116 0 0 -53 32 46 2 23 37 5 72 0 -53 20 19 -53 45 14 -52 56 31 -54 9 18 -115 0 0 -53 23 31 2 23 36 6 71 -1 -53 11 3 -53 36 1 -52 47 13 -54 0 6 -114 0 0 -53 14 0 2 23 35 6 70 -1 -53 1 31 -53 26 31 -52 37 38 -53 50 40 -113 0 0 -53 4 14 2 23 34 7 70 -2 -52 51 43 -53 16 46 -52 27 48 -53 40 57 -112 0 0 -52 54 11 2 23 33 8 69 -3 -52 41 40 -53 6 45 -52 17 42 -53 30 58 -111 0 0 -52 43 53 2 23 32 8 68 -3 -52 31 20 -52 56 28 -52 7 20 -53 20 44 -110 0 0 -52 33 19 2 23 31 9 67 -4 -52 20 44 -52 45 55 -51 56 42 -53 10 13 -109 0 0 -52 22 28 2 23 30 10 66 -5 -52 9 53 -52 35 6 -51 45 48 -52 59 27 -108 0 0 -52 11 22 2 23 29 10 66 -5 -51 58 45 -52 24 1 -51 34 38 -52 48 25 -107 0 0 -52 0 0 2 23 27 11 65 -6 -51 47 22 -52 12 40 -51 23 12 -52 37 7 -106 0 0 -51 48 22 2 23 26 11 64 -6 -51 35 42 -52 1 4 -51 11 30 -52 25 32 -105 0 0 -51 36 28 2 23 24 12 63 -7 -51 23 47 -51 49 11 -50 59 32 -52 13 42 -104 0 0 -51 24 18 2 23 22 13 62 -8 -51 11 36 -51 37 2 -50 47 18 -52 1 36 -103 0 0 -51 11 52 2 23 20 13 62 -8 -50 59 8 -51 24 38 -50 34 48 -51 49 14 -102 0 0 -50 59 10 2 23 18 14 61 -9 -50 46 25 -51 11 57 -50 22 3 -51 36 37 -101 0 0 -50 46 13 2 23 16 15 60 -10 -50 33 26 -50 59 1 -50 9 1 -51 23 43 -100 0 0 -50 32 59 2 23 14 15 59 -10 -50 20 12 -50 45 49 -49 55 44 -51 10 33 - 99 0 0 -50 19 30 2 23 12 16 58 -11 -50 6 41 -50 32 21 -49 42 11 -50 57 8 - 98 0 0 -50 5 45 2 23 10 17 58 -12 -49 52 55 -50 18 38 -49 28 22 -50 43 27 - 97 0 0 -49 51 45 2 23 7 17 57 -12 -49 38 53 -50 4 39 -49 14 18 -50 29 31 - 96 0 0 -49 37 29 2 23 5 18 56 -13 -49 24 36 -49 50 24 -48 59 58 -50 15 18 - 95 0 0 -49 22 57 2 23 2 19 55 -14 -49 10 3 -49 35 54 -48 45 23 -50 0 51 - 94 0 0 -49 8 10 2 22 59 19 54 -14 -48 55 15 -49 21 8 -48 30 33 -49 46 7 - 93 0 0 -48 53 8 2 22 56 20 54 -15 -48 40 12 -49 6 7 -48 15 27 -49 31 9 - 92 0 0 -48 37 51 2 22 53 21 53 -16 -48 24 53 -48 50 51 -48 0 6 -49 15 55 - 91 0 0 -48 22 18 2 22 50 21 52 -16 -48 9 20 -48 35 20 -47 44 30 -49 0 26 - 90 0 0 -48 6 31 2 22 47 22 51 -17 -47 53 31 -48 19 33 -47 28 40 -48 44 42 - 89 0 0 -47 50 29 2 22 44 23 50 -18 -47 37 28 -48 3 32 -47 12 34 -48 28 43 - 88 0 0 -47 34 12 2 22 40 23 49 -18 -47 21 10 -47 47 17 -46 56 14 -48 12 30 - 87 0 0 -47 17 41 2 22 37 24 49 -19 -47 4 37 -47 30 46 -46 39 40 -47 56 1 - 86 0 0 -47 0 55 2 22 33 25 48 -20 -46 47 51 -47 14 2 -46 22 51 -47 39 19 - 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2008 Sep 26 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.015, 66° remarks: * orbital elements for (178) Belisana : Mean anomaly = 116.21631394 deg Arg. of pericenter = 210.15394521 deg Long. of node = 51.17473213 deg Inclination = 1.89812734 deg Eccentricity = 0.04367358 Semimajor axis = 2.45971613 AU Perihelion dist = 2.35229153 AU Mag: H = 9.34, G = 0.15 Epoch of elements : MJD 54757.09400000 TDT (2008 Oct 18.094) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 18 178 Belisana 2h 16.0m UT 11.8 1 16 1.190 6 22 52.22TYC 0026-01061-1 12.1 12.5 36 3.2 1.517 -2.314 -11.85 -41.9362 6.384 142.30 -9.71 2.2662 0.19078 -0.55550 -5.95247 -2.04545 0.00038 0.00031 2000 114.40385720081011.00000210.153945 51.174732 1.8981270.04367358 2.4597161 2.3522915 9.4 5.00.15 RATE 2.5549160 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.032 80 1.96 0.032 0 54755.5020081018_1061-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 16, 00:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org