IOTA/IOTA-ES occultation update for (6450) 1991 GV1 / TYC 5265-00537-1 event on 2012 Sep 20, 00:24 UT Visible from Madagascar Summary ------- On 2012 Sep 20 UT, the 10 km diameter asteroid (6450) 1991 GV1 will occult a 10.5 mag star in the constellation Cetus for observers along a path across Madagascar. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.4 mag (the magnitude of the asteroid) for at most 1.0 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 12 * date and approx. time of event: 2012 Sep 20, 00:15 - 2012 Sep 20, 00:32 UT * geocentric midpoint of event [JD]: 2456190.51681667 * magnitude of target star: 10.5 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 1.0 * Moon: 19 % sunlit, 130° distance * Sun: 168° distance * rough path description: Madagascar The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 5.45 * 1 sigma uncertainty interval [seconds]: +/- 12.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .123 +/- .068) * 1 sigma uncertainty ellipse (major, minor, PA): ( .130", .054", 70° ) * approx speed of asteroid's shadow [km/s]: 9.9269 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5265-00537-1 by 6450 1991 GV1 on 2012 Sep 20 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 Latitude Latitude Latitude Latitude 84 0 0 - 4 40 50 0 15 43 9 260 -1 - 4 37 22 - 4 44 18 - 3 59 45 - 5 22 17 83 0 0 - 4 58 32 0 15 46 10 261 -2 - 4 55 4 - 5 2 1 - 4 17 20 - 5 40 7 82 0 0 - 5 16 58 0 15 48 11 261 -2 - 5 13 29 - 5 20 28 - 4 35 38 - 5 58 41 81 0 0 - 5 36 8 0 15 51 12 261 -3 - 5 32 38 - 5 39 38 - 4 54 40 - 6 17 59 80 0 0 - 5 56 1 0 15 54 13 261 -4 - 5 52 30 - 5 59 32 - 5 14 24 - 6 38 1 79 0 0 - 6 16 37 0 15 58 14 261 -5 - 6 13 6 - 6 20 9 - 5 34 52 - 6 58 46 78 0 0 - 6 37 57 0 16 2 15 261 -6 - 6 34 25 - 6 41 29 - 5 56 2 - 7 20 15 77 0 0 - 6 59 59 0 16 5 16 261 -7 - 6 56 26 - 7 3 32 - 6 17 55 - 7 42 27 76 0 0 - 7 22 44 0 16 10 17 262 -8 - 7 19 10 - 7 26 18 - 6 40 30 - 8 5 22 75 0 0 - 7 46 12 0 16 14 18 262 -9 - 7 42 37 - 7 49 47 - 7 3 48 - 8 29 0 74 0 0 - 8 10 22 0 16 19 19 262 -10 - 8 6 46 - 8 13 58 - 7 27 48 - 8 53 21 73 0 0 - 8 35 14 0 16 24 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44 10 0 32 46 6 103 0 -69 40 41 -69 47 39 -69 2 52 -70 25 51 Uncertainty in time = +/- 12 secs Prediction of 2012 Apr 8.0 Data for the target star ------------------------ * name: TYC 5265-00537-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 21 45.4039 DE: -10 13 09.016 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .023 ) * V mag [mag]: 10.5 * B mag [mag]: 11.1 * Apparent position with proper motion RA(deg): 5.6096745011 DE(deg): -10.1448505083 * Equation of equinoxes (radians) : 0.000065357298937 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6450) 1991 GV1 approx. diameter [km]: 10 approx. diameter ["]: .011 distance from Earth [AU]: 1.29900 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 685 number of rejected observations: 15 time covered by the observations: 1979 Apr 28 - 2011 Apr 06 1 sigma uncertainty ellipse (major, minor, PA): 0.128, 0.049, 69° remarks: * orbital elements for (6450) 1991 GV1 : Mean anomaly = 53.88198539 deg Arg. of pericenter = 149.57465904 deg Long. of node = 129.40769213 deg Inclination = 8.48655078 deg Eccentricity = 0.24605438 Semimajor axis = 2.53654930 AU Perihelion dist = 1.91242023 AU Mag: H = 13.13, G = 0.15 Epoch of elements : MJD 56190.01700000 TDT (2012 Sep 20.017) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 20 6450 1991 GV1 0h 24.2m UT 10.5 0 21 45.404-10 13 9.02TYC 5265-00537-1 11.1 15.4 10 1.0 1.299 -2.144 -20.88 0.0794 -10.214 172.31 1.01 0.4036 0.32421 -0.49105 -4.67633 -3.08639 -0.00073 0.00088 2000 51.4381222012 910.00000149.574659129.407692 8.4865510.24605438 2.5365493 1.912420212.6 5.00.15 RATE 2.4397150 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.130 0.054 70 6.45 0.058 0 0-1 4 056025.0020120920_0537-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 05, 22:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org