IOTA/IOTA-ES occultation update for (173) Ino / UCAC4 369-134449 event on 2022 Oct 02, 11:52 UT Visible from Australia Summary ------- On 2022 Oct 02 UT, the 140.6 km diameter asteroid (173) Ino will occult a 11.5 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.66 mag to 12.93 mag (the magnitude of the asteroid) for at most 7.670 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: 100 * date and approx. time of event: 2022 Oct 02, 11:46 - 2022 Oct 02, 11:57 * geocentric midpoint of event [JD]: 2459854.99446117 * magnitude of target star: 11.53 * magnitude drop [mag]: 1.66 * estimated maximum duration [s]: 7.670 * Moon: 45 % sunlit, 12° distance * Sun: 89° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 141 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.002", 98°) * approx speed of asteroid's shadow [km/s]: 18.3242 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 369-134449 by 173 Ino on 2022 Oct 2 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 7 0 0 18 14 33 11 46 12.2 1 107 67 17 34 38 18 54 28 17 30 28 18 58 38 .... 8 0 0 17 56 29 11 46 12.3 2 108 67 17 16 29 18 36 28 17 12 19 18 40 38 0.07 9 0 0 17 38 2 11 46 12.5 3 108 67 16 57 58 18 18 5 16 53 47 18 22 16 0.04 10 0 0 17 19 13 11 46 12.9 4 108 67 16 39 5 17 59 21 16 34 54 18 3 32 0.03 11 0 0 17 0 2 11 46 13.3 5 109 67 16 19 50 17 40 14 16 15 38 17 44 25 0.03 12 0 0 16 40 29 11 46 13.8 6 109 67 16 0 13 17 20 45 15 56 1 17 24 57 0.02 13 0 0 16 20 35 11 46 14.5 7 109 67 15 40 14 17 0 55 15 36 2 17 5 8 0.02 14 0 0 16 0 19 11 46 15.3 8 109 66 15 19 54 16 40 44 15 15 41 16 44 57 0.02 15 0 0 15 39 42 11 46 16.2 9 110 66 14 59 13 16 20 11 14 55 0 16 24 25 0.02 16 0 0 15 18 45 11 46 17.2 10 110 66 14 38 11 15 59 18 14 33 57 16 3 31 0.01 17 0 0 14 57 26 11 46 18.3 11 110 65 14 16 49 15 38 4 14 12 34 15 42 18 0.01 18 0 0 14 35 48 11 46 19.5 12 110 65 13 55 6 15 16 29 13 50 51 15 20 44 0.01 19 0 0 14 13 49 11 46 20.8 13 111 65 13 33 3 14 54 34 13 28 48 14 58 50 0.01 20 0 0 13 51 30 11 46 22.3 14 111 64 13 10 41 14 32 20 13 6 25 14 36 36 0.01 21 0 0 13 28 53 11 46 23.9 15 111 64 12 47 59 14 9 46 12 43 43 14 14 2 0.01 22 0 0 13 5 56 11 46 25.6 16 111 63 12 24 58 13 46 53 12 20 41 13 51 10 0.01 23 0 0 12 42 40 11 46 27.4 17 112 63 12 1 38 13 23 42 11 57 21 13 27 59 0.01 24 0 0 12 19 6 11 46 29.3 18 112 62 11 38 1 13 0 12 11 33 43 13 4 29 0.01 25 0 0 11 55 15 11 46 31.4 19 112 61 11 14 5 12 36 24 11 9 47 12 40 42 0.01 26 0 0 11 31 5 11 46 33.6 20 112 61 10 49 52 12 12 19 10 45 34 12 16 37 0.01 27 0 0 11 6 39 11 46 35.9 21 112 60 10 25 22 11 47 56 10 21 4 11 52 15 0.01 28 0 0 10 41 57 11 46 38.3 22 113 59 10 0 36 11 23 17 9 56 17 11 27 36 0.01 29 0 0 10 16 58 11 46 40.8 23 113 59 9 35 34 10 58 22 9 31 15 11 2 41 0.01 30 0 0 9 51 43 11 46 43.5 25 113 58 9 10 16 10 33 11 9 5 56 10 37 30 0.01 31 0 0 9 26 14 11 46 46.3 26 113 57 8 44 43 10 7 45 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55 35 -24 16 18 -22 51 35 0.00 156 0 0 -23 27 8 11 57 12.1 26 263 -55 -24 5 31 -22 48 44 -24 9 31 -22 44 44 0.00 157 0 0 -23 19 55 11 57 14.6 25 262 -56 -23 58 21 -22 41 30 -24 2 21 -22 37 29 0.00 158 0 0 -23 12 18 11 57 17.0 24 262 -57 -23 50 46 -22 33 50 -23 54 47 -22 29 49 0.00 159 0 0 -23 4 17 11 57 19.3 23 262 -58 -23 42 47 -22 25 47 -23 46 48 -22 21 46 0.00 160 0 0 -22 55 51 11 57 21.5 22 261 -58 -23 34 24 -22 17 19 -23 38 25 -22 13 17 0.00 161 0 0 -22 47 2 11 57 23.7 22 261 -59 -23 25 37 -22 8 26 -23 29 38 -22 4 25 0.00 162 0 0 -22 37 48 11 57 25.8 21 260 -59 -23 16 26 -21 59 10 -23 20 27 -21 55 8 0.00 163 0 0 -22 28 10 11 57 27.7 20 260 -60 -23 6 51 -21 49 29 -23 10 53 -21 45 27 0.00 164 0 0 -22 18 8 11 57 29.6 19 260 -61 -22 56 51 -21 39 24 -23 0 54 -21 35 22 0.00 165 0 0 -22 7 42 11 57 31.4 18 259 -61 -22 46 28 -21 28 55 -22 50 31 -21 24 52 0.00 166 0 0 -21 56 52 11 57 33.2 17 259 -62 -22 35 41 -21 18 2 -22 39 44 -21 13 59 0.00 167 0 0 -21 45 38 11 57 34.8 16 258 -62 -22 24 31 -21 6 45 -22 28 34 -21 2 42 0.00 168 0 0 -21 34 0 11 57 36.3 15 258 -63 -22 12 56 -20 55 4 -22 17 0 -20 51 1 0.00 169 0 0 -21 21 59 11 57 37.8 14 258 -64 -22 0 58 -20 43 0 -22 5 2 -20 38 56 0.00 170 0 0 -21 9 34 11 57 39.1 13 257 -64 -21 48 36 -20 30 31 -21 52 41 -20 26 27 0.01 171 0 0 -20 56 45 11 57 40.4 12 257 -65 -21 35 51 -20 17 39 -21 39 56 -20 13 34 0.01 172 0 0 -20 43 33 11 57 41.6 11 257 -65 -21 22 42 -20 4 23 -21 26 47 -20 0 18 0.01 173 0 0 -20 29 57 11 57 42.7 10 256 -65 -21 9 10 -19 50 44 -21 13 16 -19 46 39 0.01 174 0 0 -20 15 58 11 57 43.7 9 256 -66 -20 55 15 -19 36 42 -20 59 21 -19 32 36 0.01 175 0 0 -20 1 36 11 57 44.5 8 256 -66 -20 40 57 -19 22 16 -20 45 3 -19 18 10 0.01 176 0 0 -19 46 51 11 57 45.3 7 255 -67 -20 26 15 -19 7 27 -20 30 22 -19 3 21 0.01 177 0 0 -19 31 43 11 57 46.0 6 255 -67 -20 11 11 -18 52 16 -20 15 18 -18 48 9 0.02 178 0 0 -19 16 13 11 57 46.6 5 255 -67 -19 55 44 -18 36 41 -19 59 52 -18 32 34 0.02 179 0 0 -19 0 19 11 57 47.1 4 254 -67 -19 39 55 -18 20 44 -19 44 2 -18 16 36 0.02 180 0 0 -18 44 3 11 57 47.5 3 254 -68 -19 23 43 -18 4 24 -19 27 51 -18 0 16 0.03 -179 0 0 -18 27 25 11 57 47.8 2 254 -68 -19 7 8 -17 47 42 -19 11 17 -17 43 33 0.05 -178 0 0 -18 10 25 11 57 48.0 1 253 -68 -18 50 12 -17 30 38 -18 54 21 -17 26 29 0.08 -177 0 0 -17 53 3 11 57 48.1 0 253 -68 -18 32 54 -17 13 12 -18 37 3 -17 9 2 0.38 Uncertainty in time = +/- 2 secs Prediction of 2022 Oct 2.0 Data for the target star ------------------------ * name: UCAC4 369-134449 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 33 00.1918 DE: -16 15 29.419 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 33 00.1917 DE: -16 15 29.419 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (173) Ino asteroid class: approx. diameter [km]: 141 approx. diameter ["]: 0.084 distance from Earth [AU]: 2.30090 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#113 date of fit: 2022 Sep 21 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): 0.021", 0.002", 98.292° remarks: * orbital elements for (173)Ino : Mean anomaly = 306.3718795681 deg Arg. of pericenter = 228.8414132738 deg Long. of node = 148.1718812376 deg Inclination = 14.1997690118 deg Eccentricity = 0.2097554977 Semimajor axis = 2.7414398806 AU Perihelion dist = 2.1664077940 AU Mag: H = 8.02, G = 0.01 Epoch of elements : MJD 59854.49444444 TDT (2022 Oct 02.4944) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1132022Sep21,7.67,2022,10,2,11.867068,0.005356,0.004122,9.792170,-3.329282,0.005616,0.000355,0.000000,0.000000 89.3875,-16.2411,-0.66,-3.68,False UCAC4 369-134449,18.55005327,-16.2581719,0.00,11.53,0.00,0.0,0,,18.57167043,-16.2410692,1.66,0.00,0,0,0 173,Ino,12.93,140.6,2.3009,0,0,2.599,-12.72,,9.0,0 0,306.2645,2022,10,2,228.8414,148.1719,14.1998,0.20976,2.74144,2.16641,8.02,5.0,0.15 1.052,0.0210,0.0022,98,0.0044,Known errors,-1.00,-1,-1,-1 20221002_134449,59854.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 02, 00:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org