IOTA/IOTA-ES occultation update for (1067) Lunaria / TYC 6310-00728-1 event on 2008 Jul 09, 07:56 UT Visible from Brazil, Argentina, Chile Summary ------- On 2008 Jul 09 UT, the 36 km diameter asteroid (1067) Lunaria will occult a 10.6 mag star in the constellation Sagittarius for observers along a path across Brazil, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 15.1 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: 46 * date and approx. time of event: 2008 Jul 09, 07:48 - 2008 Jul 09, 08:04 UT * magnitude of target star: 10.6 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 2.7 * Moon: 42 % sunlit, 103° distance * Sun: 176° distance * rough path description: Brazil, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 1.42 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .034", 77° ) * approx speed of asteroid's shadow [km/s]: 13.2522 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6310-00728-1 by 1067 Lunaria on 2008 Jul 9 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 154 0 0 - 3 31 11 8 4 38 1 112 -5 - 3 20 35 - 3 41 47 - 2 50 32 - 4 11 54 155 0 0 - 3 55 17 8 4 38 2 112 -6 - 3 44 41 - 4 5 53 - 3 14 37 - 4 36 1 156 0 0 - 4 19 28 8 4 37 3 112 -7 - 4 8 51 - 4 30 4 - 3 38 46 - 5 0 12 157 0 0 - 4 43 41 8 4 37 4 111 -8 - 4 33 5 - 4 54 18 - 4 2 59 - 5 24 27 158 0 0 - 5 7 57 8 4 36 5 111 -9 - 4 57 21 - 5 18 34 - 4 27 14 - 5 48 44 159 0 0 - 5 32 16 8 4 35 6 111 -10 - 5 21 39 - 5 42 53 - 4 51 32 - 6 13 3 160 0 0 - 5 56 36 8 4 34 7 111 -11 - 5 45 59 - 6 7 13 - 5 15 52 - 6 37 23 161 0 0 - 6 20 56 8 4 33 8 111 -12 - 6 10 19 - 6 31 33 - 5 40 12 - 7 1 45 162 0 0 - 6 45 17 8 4 31 9 111 -13 - 6 34 40 - 6 55 55 - 6 4 33 - 7 26 6 163 0 0 - 7 9 38 8 4 30 10 111 -15 - 6 59 1 - 7 20 16 - 6 28 53 - 7 50 27 164 0 0 - 7 33 58 8 4 28 12 111 -16 - 7 23 21 - 7 44 36 - 6 53 13 - 8 14 47 165 0 0 - 7 58 17 8 4 26 13 111 -17 - 7 47 40 - 8 8 54 - 7 17 32 - 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22 0 0 -13 3 26 7 48 46 5 249 -1 -12 52 51 -13 14 1 -12 22 48 -13 44 7 - 21 0 0 -12 39 56 7 48 45 4 249 0 -12 29 20 -12 50 32 -11 59 17 -13 20 39 Uncertainty in time = +/- 5 secs [Prediction of 2008 Jul 3.0] Data for the target star ------------------------ * name: TYC 6310-00728-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 32 37.3223 DE: -21 41 29.962 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .022 ) * V mag [mag]: 10.6 * B mag [mag]: 10.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1067) Lunaria approx. diameter [km]: 36 approx. diameter ["]: .025 distance from Earth [AU]: 1.98500 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 610 number of rejected observations: 47 time covered by the observations: 1926 Sep 09 - 2008 Jun 17 1 sigma uncertainty ellipse (major, minor, PA): 0.037, 0.027, 71° remarks: * orbital elements for (1067) Lunaria : Mean anomaly = 267.45224029 deg Arg. of pericenter = 113.69275097 deg Long. of node = 289.90616915 deg Inclination = 10.56073828 deg Eccentricity = 0.18952829 Semimajor axis = 2.87566241 AU Perihelion dist = 2.33064304 AU Mag: H = 10.62, G = 0.15 Epoch of elements : MJD 54656.33100000 TDT (2008 Jul 09.331) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 9 1067 Lunaria 7h 56.7m UT 10.6 19 32 37.322-21 41 29.96TYC 6310-00728-1 10.9 15.1 36 2.7 1.985 -2.372 2.44 -113.6466 -21.692 62.15 22.30 7.9447 -0.00981 -0.13289 -7.45959 0.55120 -0.00036 -0.00006 2000 266.1726542008 7 3.00000113.692751289.906169 10.5607380.18952829 2.8756624 2.330643011.0 5.00.15 RATE 2.0211440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.034 77 2.42 0.035 0 54650.5020080709_0728-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 03, 00:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org