IOTA/IOTA-ES occultation update for (180) Garumna / TYC 6158-01295-1 event on 2009 Jul 01, 00:06 UT Visible from Venezuela, Brazil, Peru Summary ------- On 2009 Jul 01 UT, the 32 km diameter asteroid (180) Garumna will occult a 11.5 mag star in the constellation Libra for observers along a path across Venezuela, Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 15.1 mag (the magnitude of the asteroid) for at most 50.9 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 50 * date and approx. time of event: 2009 Jun 30, 22:53 - 2009 Jul 01, 02:38 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 3.6 * estimated maximum duration [s]: 50.9 * Moon: 66 % sunlit, 16° distance * Sun: 125° distance * rough path description: Venezuela, Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 1.28 * 1 sigma uncertainty interval [seconds]: +/- 65.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .026", 97° ) * approx speed of asteroid's shadow [km/s]: 0.6284 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6158-01295-1 by 180 Garumna on 2009 Jun 30 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 - 74 0 0 - 7 30 21 22 53 49 57 110 -2 - 7 46 0 - 7 14 30 - 8 25 9 - 6 32 55 - 73 0 0 - 6 11 43 23 4 37 60 114 -4 - 6 29 19 - 5 53 49 - 7 13 8 - 5 6 36 - 72 0 0 - 4 32 56 23 17 22 63 119 -8 - 4 53 15 - 4 12 12 - 5 43 32 - 3 17 10 - 71 0 0 - 2 26 56 23 32 35 65 128 -11 - 2 50 59 - 2 2 21 - 3 50 12 - 0 56 49 - 70 0 0 0 14 15 23 50 46 68 141 -15 - 0 14 27 0 43 33 - 1 25 10 2 1 6 - 69 0 0 3 32 52 24 11 33 68 159 -19 3 0 5 4 5 57 1 37 56 5 31 32 - 68 0 0 7 12 30 24 32 46 66 175 -23 6 38 59 7 45 48 5 12 33 9 9 43 - 67 0 0 10 43 59 24 51 38 62 188 -26 10 13 6 11 14 23 8 52 1 12 30 7 - 66 0 0 13 50 39 25 7 5 58 196 -29 13 23 21 14 17 31 12 11 25 15 24 23 - 65 0 0 16 31 27 25 19 30 54 201 -30 16 7 17 16 55 16 15 3 48 17 54 46 - 64 0 0 18 50 39 25 29 36 51 205 -31 18 28 58 19 12 5 17 32 11 20 5 51 - 63 0 0 20 52 47 25 37 58 48 208 -32 20 33 0 21 12 22 19 41 25 22 1 41 - 62 0 0 22 41 25 25 45 0 45 210 -32 22 23 8 22 59 34 21 35 34 23 45 23 - 61 0 0 24 19 14 25 51 1 42 213 -32 24 2 7 24 36 14 23 17 45 25 19 16 - 60 0 0 25 48 13 25 56 13 40 214 -32 25 32 3 26 4 17 24 50 15 26 45 2 - 59 0 0 27 9 51 26 0 45 38 216 -32 26 54 28 27 25 9 26 14 46 28 4 1 - 58 0 0 28 25 16 26 4 45 36 217 -32 28 10 33 28 39 56 27 32 35 29 17 14 - 57 0 0 29 35 23 26 8 18 34 219 -32 29 21 13 29 49 31 28 44 43 30 25 28 - 56 0 0 30 40 53 26 11 27 32 220 -32 30 27 12 30 54 33 29 51 57 31 29 21 - 55 0 0 31 42 21 26 14 17 30 221 -31 31 29 4 31 55 37 30 54 54 32 29 25 - 54 0 0 32 40 14 26 16 49 28 222 -31 32 27 18 32 53 9 31 54 5 33 26 5 - 53 0 0 33 34 56 26 19 6 27 223 -31 33 22 19 33 47 32 32 49 54 34 19 42 - 52 0 0 34 26 45 26 21 10 25 224 -30 34 14 24 34 39 5 33 42 44 35 10 34 - 51 0 0 35 15 58 26 23 2 24 225 -30 35 3 52 35 28 3 34 32 50 35 58 56 - 50 0 0 36 2 49 26 24 43 23 226 -29 35 50 57 36 14 42 35 20 29 36 45 2 - 49 0 0 36 47 31 26 26 16 21 227 -29 36 35 50 36 59 11 36 5 53 37 29 2 - 48 0 0 37 30 12 26 27 39 20 228 -28 37 18 42 37 41 42 36 49 14 38 11 6 - 47 0 0 38 11 3 26 28 55 19 229 -28 37 59 43 38 22 23 37 30 40 38 51 24 - 46 0 0 38 50 11 26 30 4 18 230 -28 38 39 0 39 1 23 38 10 20 39 30 1 - 45 0 0 39 27 44 26 31 6 16 230 -27 39 16 41 39 38 47 38 48 22 40 7 6 - 44 0 0 40 3 47 26 32 2 15 231 -27 39 52 51 40 14 44 39 24 52 40 42 43 - 43 0 0 40 38 27 26 32 53 14 232 -26 40 27 38 40 49 17 39 59 56 41 16 59 - 42 0 0 41 11 49 26 33 39 13 233 -26 41 1 6 41 22 32 40 33 40 41 49 59 - 41 0 0 41 43 56 26 34 20 12 234 -25 41 33 19 41 54 33 41 6 8 42 21 46 - 40 0 0 42 14 53 26 34 57 11 234 -25 42 4 21 42 25 25 41 37 25 42 52 24 - 39 0 0 42 44 44 26 35 30 10 235 -24 42 34 17 42 55 11 42 7 33 43 21 58 - 38 0 0 43 13 32 26 35 59 9 236 -24 43 3 10 43 23 54 42 36 38 43 50 30 - 37 0 0 43 41 20 26 36 25 8 237 -23 43 31 2 43 51 39 43 4 42 44 18 3 - 36 0 0 44 8 12 26 36 47 7 238 -23 43 57 58 44 18 26 43 31 48 44 44 40 - 35 0 0 44 34 9 26 37 7 6 238 -22 44 23 59 44 44 20 43 57 59 45 10 24 - 34 0 0 44 59 14 26 37 23 6 239 -22 44 49 8 45 9 21 44 23 17 45 35 17 - 33 0 0 45 23 30 26 37 37 5 240 -21 45 13 27 45 33 34 44 47 44 45 59 22 - 32 0 0 45 46 58 26 37 48 4 241 -21 45 36 58 45 56 59 45 11 23 46 22 39 - 31 0 0 46 9 41 26 37 57 3 241 -21 45 59 43 46 19 39 45 34 16 46 45 11 - 30 0 0 46 31 39 26 38 4 2 242 -20 46 21 45 46 41 35 45 56 25 47 7 1 - 29 0 0 46 52 56 26 38 9 1 243 -20 46 43 4 47 2 49 46 17 50 47 28 8 - 28 0 0 47 13 32 26 38 11 1 244 -19 47 3 42 47 23 22 46 38 34 47 48 35 Uncertainty in time = +/- 69 secs Prediction of 2009 Jun 30.0 Data for the target star ------------------------ * name: TYC 6158-01295-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 44 55.6783 DE: -17 06 06.426 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .023 ) * V mag [mag]: 11.5 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (180) Garumna approx. diameter [km]: 32 approx. diameter ["]: .021 distance from Earth [AU]: 2.12300 * orbital information: orbit source: Preston date of fit: 2009 Jun 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1036 number of rejected observations: 94 time covered by the observations: 1919 Apr 21 - 2009 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.012, 108° remarks: * orbital elements for (180) Garumna : Mean anomaly = 94.58817540 deg Arg. of pericenter = 175.31290652 deg Long. of node = 312.67627538 deg Inclination = 0.87048928 deg Eccentricity = 0.16856610 Semimajor axis = 2.71958770 AU Perihelion dist = 2.26115742 AU Mag: H = 10.04, G = 0.15 Epoch of elements : MJD 55013.00400000 TDT (2009 Jul 01.004) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 1 180 Garumna 0h 10.9m UT 11.5 14 44 55.678-17 6 6.43TYC 6158-01295-1 11.9 15.1 32 50.9 2.123 0.090 0.72 -60.6820 -17.102 178.23 23.11 0.1816 -0.14733 0.34800 0.30880 0.17444 0.00438 -0.00131 2000 93.9280152009 628.00000175.312907312.676275 0.8704890.16856610 2.7195877 2.261157410.3 5.00.15 RATE 2.1976040 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.026 97 2.28 0.027 0 55012.0020090701_1295-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 30, 15:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org