IOTA/IOTA-ES occultation update for (1228) Scabiosa / TYC 6783-02587-1 event on 2008 May 14, 05:18 UT Visible from Uruguay, Argentina, Chile Summary ------- On 2008 May 14 UT, the 17 km diameter asteroid (1228) Scabiosa will occult a 10.0 mag star in the constellation Scorpius for observers along a path across Uruguay, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.3 mag (the magnitude of the asteroid) for at most 1.5 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: 23 * date and approx. time of event: 2008 May 14, 05:09 - 2008 May 14, 05:28 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 1.5 * Moon: 71 % sunlit, 75° distance * Sun: 169° distance * rough path description: Uruguay, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 2.91 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .045 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .046", .038", 98° ) * approx speed of asteroid's shadow [km/s]: 11.0862 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6783-02587-1 by 1228 Scabiosa on 2008 May 14 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 -161 0 0 4 22 22 5 28 2 1 116 -10 4 27 31 4 17 13 4 57 26 3 47 16 -160 0 0 3 53 10 5 28 1 2 116 -11 3 58 19 3 48 1 4 28 17 3 18 0 -159 0 0 3 23 43 5 28 1 3 116 -12 3 28 53 3 18 34 3 58 54 2 48 31 -158 0 0 2 54 3 5 28 0 4 116 -13 2 59 13 2 48 53 3 29 16 2 18 48 -157 0 0 2 24 10 5 27 59 5 116 -14 2 29 20 2 18 59 2 59 26 1 48 52 -156 0 0 1 54 4 5 27 58 6 116 -15 1 59 15 1 48 54 2 29 23 1 18 44 -155 0 0 1 23 47 5 27 57 7 116 -16 1 28 59 1 18 36 1 59 8 0 48 24 -154 0 0 0 53 20 5 27 55 8 116 -18 0 58 31 0 48 8 1 28 43 0 17 54 -153 0 0 0 22 43 5 27 54 10 116 -19 0 27 54 0 17 31 0 58 8 - 0 12 45 -152 0 0 - 0 8 4 5 27 52 11 116 -20 - 0 2 52 - 0 13 16 0 27 24 - 0 43 34 -151 0 0 - 0 38 58 5 27 49 12 116 -21 - 0 33 46 - 0 44 11 - 0 3 29 - 1 14 30 -150 0 0 - 1 10 0 5 27 47 13 116 -22 - 1 4 48 - 1 15 13 - 0 34 29 - 1 45 34 -149 0 0 - 1 41 9 5 27 44 14 116 -23 - 1 35 56 - 1 46 21 - 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1 0 0 -28 13 36 5 10 15 30 255 -19 -28 8 44 -28 18 29 -27 40 22 -28 46 53 0 0 0 -27 55 44 5 10 11 29 255 -18 -27 50 51 -28 0 37 -27 22 25 -28 29 5 1 0 0 -27 37 27 5 10 6 28 254 -18 -27 32 33 -27 42 20 -27 4 4 -28 10 52 2 0 0 -27 18 44 5 10 2 27 254 -17 -27 13 50 -27 23 39 -26 45 17 -27 52 13 3 0 0 -26 59 36 5 9 58 26 253 -16 -26 54 41 -27 4 31 -26 26 5 -27 33 10 4 0 0 -26 40 4 5 9 54 25 253 -15 -26 35 8 -26 44 59 -26 6 28 -27 13 42 5 0 0 -26 20 6 5 9 50 24 252 -14 -26 15 9 -26 25 2 -25 46 25 -26 53 48 6 0 0 -25 59 43 5 9 46 23 252 -13 -25 54 46 -26 4 40 -25 25 58 -26 33 30 7 0 0 -25 38 55 5 9 42 22 251 -12 -25 33 58 -25 43 53 -25 5 6 -26 12 47 8 0 0 -25 17 43 5 9 38 21 251 -11 -25 12 44 -25 22 41 -24 43 49 -25 51 38 9 0 0 -24 56 5 5 9 35 20 250 -10 -24 51 6 -25 1 4 -24 22 7 -25 30 6 10 0 0 -24 34 3 5 9 32 19 250 -9 -24 29 4 -24 39 3 -24 0 1 -25 8 8 11 0 0 -24 11 37 5 9 28 18 250 -8 -24 6 37 -24 16 37 -23 37 30 -24 45 46 12 0 0 -23 48 46 5 9 25 17 249 -7 -23 43 46 -23 53 47 -23 14 35 -24 23 0 13 0 0 -23 25 32 5 9 22 16 249 -6 -23 20 30 -23 30 33 -22 51 16 -23 59 50 14 0 0 -23 1 53 5 9 20 15 248 -5 -22 56 51 -23 6 55 -22 27 33 -23 36 15 15 0 0 -22 37 50 5 9 17 15 248 -4 -22 32 48 -22 42 53 -22 3 26 -23 12 17 16 0 0 -22 13 24 5 9 15 14 248 -3 -22 8 21 -22 18 28 -21 38 55 -22 47 56 17 0 0 -21 48 35 5 9 12 12 247 -2 -21 43 31 -21 53 39 -21 14 2 -22 23 11 18 0 0 -21 23 23 5 9 10 11 247 -1 -21 18 18 -21 28 27 -20 48 45 -21 58 2 19 0 0 -20 57 48 5 9 8 10 246 0 -20 52 42 -21 2 53 -20 23 6 -21 32 32 Uncertainty in time = +/- 5 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 6783-02587-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 01 33.1942 DE: -25 32 43.264 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .028 ) * V mag [mag]: 10.0 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1228) Scabiosa approx. diameter [km]: 17 approx. diameter ["]: .013 distance from Earth [AU]: 1.75700 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1003 number of rejected observations: 47 time covered by the observations: 1931 Oct 05 - 2008 Apr 26 1 sigma uncertainty ellipse (major, minor, PA): 0.040, 0.025, 100° remarks: * orbital elements for (1228) Scabiosa : Mean anomaly = 80.96333558 deg Arg. of pericenter = 206.34870931 deg Long. of node = 308.15323718 deg Inclination = 3.28821704 deg Eccentricity = 0.03831337 Semimajor axis = 2.76906490 AU Perihelion dist = 2.66297269 AU Mag: H = 11.49, G = 0.15 Epoch of elements : MJD 54600.22100000 TDT (2008 May 14.221) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 14 1228 Scabiosa 5h 18.5m UT 10.0 16 1 33.194-25 32 43.26TYC 6783-02587-1 11.2 15.3 17 1.5 1.757 -2.267 6.31 -71.5624 -25.547 99.47 18.72 5.3083 -0.02254 -0.11064 -6.12921 1.25996 -0.00081 0.00063 2000 80.9160652008 514.00000206.348709308.153237 3.2882170.03831337 2.7690649 2.662972711.5 5.00.15 RATE 2.1389680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.046 0.038 98 3.91 0.039 0 54594.5020080514_2587-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org