IOTA/IOTA-ES occultation update for (11705) 1998 GN7 / TYC 6351-00959-1 event on 2012 Aug 07, 14:39 UT Visible from Hawaii, SE Australia Summary ------- On 2012 Aug 07 UT, the 11 km diameter asteroid (11705) 1998 GN7 will occult a 10.4 mag star in the constellation Capricornus for observers along a path across Hawaii, SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 14.7 mag (the magnitude of the asteroid) for at most 1.1 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: 9 * date and approx. time of event: 2012 Aug 07, 14:29 - 2012 Aug 07, 14:50 UT * geocentric midpoint of event [JD]: 2456147.11125 * magnitude of target star: 10.4 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 1.1 * Moon: 71 % sunlit, 64° distance * Sun: 177° distance * rough path description: Hawaii, SE Australia The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 7.59 * 1 sigma uncertainty interval [seconds]: +/- 8.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .123 +/- .068) * 1 sigma uncertainty ellipse (major, minor, PA): ( .123", .068", 86° ) * approx speed of asteroid's shadow [km/s]: 9.9296 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6351-00959-1 by 11705 1998 GN7 on 2012 Aug 7 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 ' " Longitude Longitude Longitude Longitude -136 59 31 30 0 0 14 29 58 2 248 -1 -137 8 46 -136 50 13 -139 23 59 ... .. .. -139 36 56 29 0 0 14 30 0 4 247 -4 -139 45 24 -139 28 26 -141 49 51 -137 14 51 Latitude Latitude Latitude Latitude -141 0 0 28 25 46 14 30 1 6 246 -5 28 29 12 28 22 20 29 21 8 27 30 8 -142 0 0 27 59 55 14 30 2 7 246 -6 28 3 22 27 56 28 28 55 37 27 3 56 -143 0 0 27 33 6 14 30 4 8 245 -7 27 36 34 27 29 38 28 29 9 26 36 45 -144 0 0 27 5 18 14 30 6 9 245 -8 27 8 48 27 1 49 28 1 44 26 8 35 -145 0 0 26 36 31 14 30 7 10 244 -9 26 40 2 26 33 0 27 33 19 25 39 25 -146 0 0 26 6 43 14 30 10 11 244 -10 26 10 16 26 3 11 27 3 55 25 9 13 -147 0 0 25 35 55 14 30 12 12 243 -11 25 39 29 25 32 20 26 33 30 24 38 0 -148 0 0 25 4 3 14 30 14 13 243 -12 25 7 39 25 0 28 26 2 4 24 5 44 -149 0 0 24 31 9 14 30 17 14 243 -13 24 34 47 24 27 32 25 29 35 23 32 24 -150 0 0 23 57 11 14 30 20 15 242 -14 24 0 50 23 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50 24 3 124 -2 -62 14 48 -62 22 22 -61 17 38 -63 19 56 20 0 0 -61 58 28 14 50 24 2 125 -2 -61 54 39 -62 2 17 -60 56 58 -63 0 22 19 0 0 -61 37 35 14 50 25 2 126 -1 -61 33 44 -61 41 25 .. .. .. -62 40 3 18 0 0 -61 15 54 14 50 25 1 127 0 -61 12 1 -61 19 47 .. .. .. -62 18 57 Uncertainty in time = +/- 11 secs Prediction of 2012 Jun 21.0 Data for the target star ------------------------ * name: TYC 6351-00959-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 19 42.9727 DE: -17 59 57.877 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .034 ) * V mag [mag]: 10.4 * B mag [mag]: 11.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (11705) 1998 GN7 approx. diameter [km]: 11 approx. diameter ["]: .013 distance from Earth [AU]: 1.19900 * orbital information: orbit source: Preston date of fit: 2012 Jun 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 845 number of rejected observations: 11 time covered by the observations: 1950 Dec 16 - 2012 May 16 1 sigma uncertainty ellipse (major, minor, PA): 0.119, 0.059, 86° remarks: * orbital elements for (11705) 1998 GN7 : Mean anomaly = 334.53337985 deg Arg. of pericenter = 222.41550231 deg Long. of node = 131.05717083 deg Inclination = 13.86946739 deg Eccentricity = 0.18958675 Semimajor axis = 2.64071059 AU Perihelion dist = 2.14006684 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 56146.61100000 TDT (2012 Aug 07.611) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 7 11705 1998 GN7 14h 40.2m UT 10.4 21 19 42.973-17 59 57.88TYC 6351-00959-1 11.5 14.7 11 1.1 1.199 -1.885 -31.12 143.3557 -17.991 -38.62 16.19 14.6700 0.21952 -0.18959 -3.66420 -4.24079 -0.00022 0.00015 2000 333.0149672012 8 1.00000222.415502131.057171 13.8694670.18958675 2.6407106 2.140066912.4 5.00.15 RATE 2.2967980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.123 0.068 86 8.59 0.096 0 0-3 3 056099.0020120807_0959-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 21, 00:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org