IOTA/IOTA-ES occultation update for (1251) Hedera / TYC 1303-01092-1 event on 2009 Feb 05, 05:24 UT Visible from Summary ------- On 2009 Feb 05 UT, the 26 km diameter asteroid (1251) Hedera will occult a 11.7 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 15.1 mag (the magnitude of the asteroid) for at most 6.9 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: . The event at a glimpse ---------------------- * Rank: 8 * date and approx. time of event: 2009 Feb 05, 05:05 - 2009 Feb 05, 05:43 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 6.9 * Moon: 74 % sunlit, 14° distance * Sun: 130° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 8.25 * 1 sigma uncertainty interval [seconds]: +/- 58.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .140 +/- .162) * 1 sigma uncertainty ellipse (major, minor, PA): ( .162", .140", 360° ) * approx speed of asteroid's shadow [km/s]: 3.8151 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1303-01092-1 by 1251 Hedera on 2009 Feb 5 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude - 44 48 33 - 4 17 29 5 5 7 8 289 -56 - 45 22 53 - 4 10 39 - 44 11 39 - 4 25 11 - 52 4 18 - 3 13 57 ... .. .. .. .. .. - 48 26 21 - 2 16 52 5 5 37 12 289 -60 - 48 50 38 - 2 13 26 - 48 1 15 - 2 20 35 - 54 18 26 - 1 41 57 ... .. .. .. .. .. - 51 4 49 - 0 36 31 5 6 6 15 289 -63 - 51 25 3 - 0 34 29 - 50 44 9 - 0 38 43 - 56 13 52 - 0 16 33 - 43 3 25 - 1 55 45 - 53 14 29 0 53 52 5 6 35 17 289 -65 - 53 32 25 0 55 6 - 52 56 16 0 52 31 - 57 56 16 1 4 13 - 46 52 42 0 8 38 - 55 6 15 2 17 59 5 7 5 20 289 -68 - 55 22 40 2 18 41 - 54 49 37 2 17 12 - 59 28 57 2 21 27 - 49 33 12 1 49 39 - 56 45 29 3 37 40 5 7 34 21 288 -70 - 57 0 49 3 37 59 - 56 29 58 3 37 18 - 60 54 0 3 35 56 - 51 42 47 3 20 5 - 58 15 18 4 54 2 5 8 4 23 288 -71 - 58 29 51 4 54 3 - 58 0 37 4 53 58 - 62 12 52 4 48 9 - 53 33 40 4 44 2 - 59 37 44 6 7 45 5 8 33 25 287 -73 - 59 51 39 6 7 31 - 59 23 42 6 7 55 - 63 26 36 5 58 29 - 55 11 38 6 3 29 - 60 54 10 7 19 19 5 9 2 26 287 -75 - 61 7 35 7 18 54 - 60 40 38 7 19 42 - 64 35 59 7 7 14 - 56 40 1 7 19 35 - 62 5 35 8 29 6 5 9 32 27 286 -76 - 62 18 36 8 28 32 - 61 52 29 8 29 39 - 65 41 37 8 14 36 - 58 0 54 8 33 4 - 63 12 45 9 37 23 5 10 1 29 286 -78 - 63 25 25 9 36 40 - 62 59 59 9 38 4 - 66 43 59 9 20 47 - 59 15 41 9 44 26 - 64 16 14 10 44 22 5 10 31 30 285 -79 - 64 28 38 10 43 31 - 64 3 45 10 45 11 - 67 43 27 10 25 55 - 60 25 25 10 54 3 - 65 16 30 11 50 13 5 11 0 31 284 -80 - 65 28 40 11 49 16 - 65 4 16 11 51 8 - 68 40 21 11 30 8 - 61 30 51 12 2 11 - 66 13 55 12 55 5 5 11 29 32 284 -81 - 66 25 54 12 54 2 - 66 1 53 12 56 6 - 69 34 56 12 33 32 - 62 32 33 13 9 2 - 67 8 47 13 59 5 5 11 59 33 283 -83 - 67 20 36 13 57 57 - 66 56 55 14 0 12 - 70 27 26 13 36 12 - 63 31 0 14 14 49 - 68 1 22 15 2 19 5 12 28 34 282 -83 - 68 13 3 15 1 7 - 67 49 38 15 3 31 - 71 18 1 14 38 13 - 64 26 33 15 19 39 - 68 51 51 16 4 53 5 12 57 35 281 -84 - 69 3 25 16 3 36 - 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19 52 48 81 23 13 ... .. .. .. .. .. Uncertainty in time = +/- 62 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 1303-01092-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 47 16.4455 DE: +18 18 12.339 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .137, .161 ) * V mag [mag]: 11.7 * B mag [mag]: 12.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1251) Hedera approx. diameter [km]: 26 approx. diameter ["]: .018 distance from Earth [AU]: 2.01700 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 987 number of rejected observations: 52 time covered by the observations: 1915 Feb 05 - 2008 Oct 21 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.019, 85° remarks: * orbital elements for (1251) Hedera : Mean anomaly = 86.76817278 deg Arg. of pericenter = 217.46830282 deg Long. of node = 140.75076578 deg Inclination = 6.04003153 deg Eccentricity = 0.15471746 Semimajor axis = 2.71876756 AU Perihelion dist = 2.29812674 AU Mag: H = 10.78, G = 0.15 Epoch of elements : MJD 54867.22500000 TDT (2009 Feb 05.225) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 5 1251 Hedera 5h 24.2m UT 11.7 5 47 16.445 18 18 12.34TYC 1303-01092-1 12.6 15.1 26 6.9 2.017 -0.391 7.54 -129.7358 18.302 102.45 -15.88 5.4037 0.57327 0.42559 -1.28269 1.72964 0.00449 0.00044 2000 85.1796852009 129.00000217.468303140.750766 6.0400320.15471746 2.7187676 2.298126710.5 5.00.15 RATE 2.1985990 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.162 0.140 360 9.25 0.147 0 54776.5020090205_1092-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org