IOTA/IOTA-ES occultation update for (1117) Reginita / TYC 6264-01540-1 event on 2008 Jul 03, 04:22 UT Visible from W Africa, Brazil, Peru Summary ------- On 2008 Jul 03 UT, the 14 km diameter asteroid (1117) Reginita will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across W Africa, Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.3 mag (the magnitude of the asteroid) for at most 2.7 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: 43 * date and approx. time of event: 2008 Jul 03, 04:02 - 2008 Jul 03, 04:41 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 2.7 * Moon: 0 % sunlit, 166° distance * Sun: 168° distance * rough path description: W Africa, Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 1.52 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .035", 91° ) * approx speed of asteroid's shadow [km/s]: 5.3436 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6264-01540-1 by 1117 Reginita on 2008 Jul 3 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 -165 0 0 -13 8 0 4 41 44 8 105 0 -13 4 4 -13 11 56 -12 52 7 -13 23 53 -164 0 0 -13 22 23 4 41 41 9 104 -1 -13 18 27 -13 26 18 -13 6 31 -13 38 14 -163 0 0 -13 36 24 4 41 37 10 104 -2 -13 32 28 -13 40 19 -13 20 33 -13 52 13 -162 0 0 -13 50 3 4 41 34 11 104 -3 -13 46 8 -13 53 57 -13 34 14 -14 5 51 -161 0 0 -14 3 20 4 41 30 12 104 -4 -13 59 25 -14 7 14 -13 47 32 -14 19 7 -160 0 0 -14 16 15 4 41 25 13 104 -5 -14 12 20 -14 20 9 -14 0 28 -14 32 1 -159 0 0 -14 28 48 4 41 21 14 103 -6 -14 24 54 -14 32 42 -14 13 3 -14 44 32 -158 0 0 -14 40 59 4 41 16 15 103 -7 -14 37 5 -14 44 52 -14 25 15 -14 56 42 -157 0 0 -14 52 48 4 41 10 16 103 -8 -14 48 55 -14 56 41 -14 37 5 -15 8 30 -156 0 0 -15 4 15 4 41 5 17 103 -9 -15 0 22 -15 8 8 -14 48 34 -15 19 57 -155 0 0 -15 15 21 4 40 59 17 102 -10 -15 11 28 -15 19 13 -14 59 40 -15 31 1 -154 0 0 -15 26 4 4 40 53 18 102 -11 -15 22 12 -15 29 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2 18 3 252 -9 19 5 1 18 57 0 19 17 13 18 44 49 12 0 0 19 19 13 4 2 17 2 252 -9 19 23 14 19 15 13 19 35 24 19 3 3 13 0 0 19 37 10 4 2 16 1 252 -8 19 41 10 19 33 10 19 53 19 19 21 1 14 0 0 19 54 49 4 2 16 0 253 -7 19 58 49 19 50 50 20 10 58 19 38 42 Uncertainty in time = +/- 6 secs [Prediction of 2008 Jun 19.0] Data for the target star ------------------------ * name: TYC 6264-01540-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 09 42.9826 DE: -15 59 24.508 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .020 ) * V mag [mag]: 11.4 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1117) Reginita approx. diameter [km]: 14 approx. diameter ["]: .024 distance from Earth [AU]: 0.81500 * orbital information: orbit source: Preston date of fit: 2008 Jun 18 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 964 number of rejected observations: 60 time covered by the observations: 1904 Oct 09 - 2008 Jun 15 1 sigma uncertainty ellipse (major, minor, PA): 0.049, 0.028, 91° remarks: * orbital elements for (1117) Reginita : Mean anomaly = 346.38717620 deg Arg. of pericenter = 150.71288749 deg Long. of node = 147.24847244 deg Inclination = 4.33931029 deg Eccentricity = 0.19780735 Semimajor axis = 2.24805683 AU Perihelion dist = 1.80337467 AU Mag: H = 11.71, G = 0.15 Epoch of elements : MJD 54650.18200000 TDT (2008 Jul 03.182) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 3 1117 Reginita 4h 22.1m UT 11.4 18 9 42.983-15 59 24.51TYC 6264-01540-1 11.5 13.3 14 2.7 0.815 -2.167 -9.03 -74.6634 -15.987 115.54 22.93 4.3681 -0.02266 0.07793 -2.89756 -0.83712 0.00078 -0.00061 2000 346.3339572008 7 3.00000150.712887147.248472 4.3393100.19780735 2.2480568 1.803374711.9 5.00.15 RATE 2.9241060 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.035 91 2.52 0.036 0 54636.5020080703_1540-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 19, 01:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org