IOTA/IOTA-ES occultation update for (167) Urda / TYC 281-00351-1 event on 2024 Jun 28, 08:21 UT Visible from Summary ------- On 2024 Jun 28 UT, the 39.5682612559793 km diameter asteroid (167) Urda will occult a 10.2 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.59 mag to 14.72 mag (the magnitude of the asteroid) for at most 2.160 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2024 Jun 28, 08:15 - 2024 Jun 28, 08:27 * geocentric midpoint of event [JD]: 2460489.84828359 * magnitude of target star: 10.15 * magnitude drop [mag]: 4.59 * estimated maximum duration [s]: 2.160 * Moon: 57 % sunlit, 176° distance * Sun: 86° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.003", 112°) * approx speed of asteroid's shadow [km/s]: 18.3703 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 281-00351-1 by 167 Urda on 2024 Jun 28 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 53 0 0 13 59 0 8 15 49.4 1 90 80 13 48 3 14 9 55 13 45 7 14 12 52 .... 54 0 0 13 58 38 8 15 49.6 2 90 80 13 47 42 14 9 34 13 44 45 14 12 30 0.12 55 0 0 13 57 52 8 15 49.8 3 91 80 13 46 55 14 8 47 13 43 58 14 11 44 0.14 56 0 0 13 56 40 8 15 50.1 4 91 81 13 45 44 14 7 36 13 42 47 14 10 33 0.15 57 0 0 13 55 4 8 15 50.5 5 91 81 13 44 8 14 6 0 13 41 11 14 8 57 0.15 58 0 0 13 53 3 8 15 51.1 6 91 80 13 42 7 14 4 0 13 39 9 14 6 56 0.16 59 0 0 13 50 37 8 15 51.7 7 91 80 13 39 40 14 1 34 13 36 43 14 4 31 0.16 60 0 0 13 47 46 8 15 52.5 8 92 80 13 36 49 13 58 43 13 33 52 14 1 40 0.16 61 0 0 13 44 31 8 15 53.3 9 92 80 13 33 33 13 55 28 13 30 36 13 58 25 0.16 62 0 0 13 40 50 8 15 54.2 10 92 79 13 29 52 13 51 47 13 26 55 13 54 44 0.16 63 0 0 13 36 44 8 15 55.3 10 92 79 13 25 46 13 47 42 13 22 48 13 50 39 0.16 64 0 0 13 32 13 8 15 56.4 11 93 78 13 21 15 13 43 11 13 18 17 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7 55 0.17 -154 0 0 -31 30 44 8 26 52.9 20 283 -64 -31 41 47 -31 19 40 -31 44 46 -31 16 41 0.17 -153 0 0 -31 39 7 8 26 54.7 19 282 -65 -31 50 10 -31 28 4 -31 53 9 -31 25 6 0.17 -152 0 0 -31 47 9 8 26 56.3 18 282 -65 -31 58 11 -31 36 7 -32 1 10 -31 33 8 0.17 -151 0 0 -31 54 48 8 26 58.0 17 281 -66 -32 5 50 -31 43 47 -32 8 48 -31 40 49 0.17 -150 0 0 -32 2 6 8 26 59.5 16 281 -67 -32 13 7 -31 51 5 -32 16 5 -31 48 7 0.17 -149 0 0 -32 9 2 8 27 0.9 15 280 -68 -32 20 2 -31 58 2 -32 23 0 -31 55 4 0.17 -148 0 0 -32 15 36 8 27 2.3 15 280 -68 -32 26 36 -32 4 36 -32 29 34 -32 1 38 0.17 -147 0 0 -32 21 48 8 27 3.6 14 279 -69 -32 32 47 -32 10 49 -32 35 45 -32 7 51 0.17 -146 0 0 -32 27 38 8 27 4.8 13 279 -70 -32 38 37 -32 16 40 -32 41 35 -32 13 42 0.17 -145 0 0 -32 33 7 8 27 5.9 12 278 -71 -32 44 5 -32 22 9 -32 47 3 -32 19 12 0.17 -144 0 0 -32 38 14 8 27 7.0 11 277 -71 -32 49 12 -32 27 16 -32 52 9 -32 24 19 0.17 -143 0 0 -32 42 59 8 27 8.0 10 277 -72 -32 53 57 -32 32 2 -32 56 54 -32 29 5 0.17 -142 0 0 -32 47 23 8 27 8.9 10 276 -73 -32 58 20 -32 36 26 -33 1 17 -32 33 29 0.17 -141 0 0 -32 51 24 8 27 9.7 9 276 -74 -33 2 21 -32 40 28 -33 5 18 -32 37 31 0.17 -140 0 0 -32 55 5 8 27 10.4 8 275 -74 -33 6 1 -32 44 9 -33 8 58 -32 41 12 0.17 -139 0 0 -32 58 23 8 27 11.1 7 275 -75 -33 9 20 -32 47 28 -33 12 16 -32 44 31 0.17 -138 0 0 -33 1 21 8 27 11.7 6 274 -75 -33 12 16 -32 50 25 -33 15 13 -32 47 28 0.18 -137 0 0 -33 3 56 8 27 12.2 5 274 -76 -33 14 52 -32 53 1 -33 17 49 -32 50 4 0.18 -136 0 0 -33 6 10 8 27 12.7 4 273 -77 -33 17 6 -32 55 15 -33 20 3 -32 52 19 0.18 -135 0 0 -33 8 3 8 27 13.0 4 273 -77 -33 18 58 -32 57 8 -33 21 55 -32 54 12 0.18 -134 0 0 -33 9 34 8 27 13.3 3 272 -78 -33 20 30 -32 58 39 -33 23 26 -32 55 43 0.19 -133 0 0 -33 10 44 8 27 13.5 2 271 -78 -33 21 39 -32 59 49 -33 24 36 -32 56 53 0.20 -132 0 0 -33 11 33 8 27 13.7 1 271 -79 -33 22 28 -33 0 38 -33 25 24 -32 57 42 0.23 -131 0 0 -33 12 0 8 27 13.7 0 270 -79 -33 22 55 -33 1 5 -33 25 51 -32 58 9 0.43 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: TYC 281-00351-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 12 11 22.4366 DE: +00 17 16.339 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 12 11 22.4365 DE: +00 17 16.340 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.2 * B mag [mag]: 10.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (167) Urda asteroid class: approx. diameter [km]: 40 approx. diameter ["]: 0.020 distance from Earth [AU]: 2.74020 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.012", 0.003", 112.4° remarks: * orbital elements for (167)Urda : Mean anomaly = 273.8677783627 deg Arg. of pericenter = 127.6465140152 deg Long. of node = 166.1054208516 deg Inclination = 2.2173839206 deg Eccentricity = 0.0371918703 Semimajor axis = 2.8535096316 AU Perihelion dist = 2.7473822715 AU Mag: H = 9.24, G = 0.15 Epoch of elements : MJD 60489.34828396 TDT (2024 Jun 28.3483) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,2.16,2024,6,28,8.358806,-0.066165,-0.152334,9.511969,-4.127103,0.005095,-0.002195,0.000000,0.000000 140.8480,0.1522,55.46,23.25,False TYC 281-00351-1,12.18956574,0.2878719,10.79,10.15,9.80,0.1,0,,12.21041095,0.1522102,4.59,4.48,0,0,0 167,Urda,14.72,39.767,2.7402,0,0,2.035,-13.25,,1.8,0 0,273.7966,2024,6,28,127.6465,166.1054,2.2174,0.03719,2.85351,2.74738,9.23,5.0,0.15 1.135,0.0120,0.0027,112,0.0027,Known errors,0.91,0,-1,-1 20240628_0351-1,60139.41 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org