IOTA/IOTA-ES occultation update for (173) Ino / UCAC4 363-169220 event on 2022 Oct 20, 23:38 UT Visible from South America Summary ------- On 2022 Oct 20 UT, the 140.6 km diameter asteroid (173) Ino will occult a 12.1 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.34 mag to 13.05 mag (the magnitude of the asteroid) for at most 5.660 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 20, 23:34 - 2022 Oct 20, 23:43 * geocentric midpoint of event [JD]: 2459873.48517650 * magnitude of target star: 12.09 * magnitude drop [mag]: 1.34 * estimated maximum duration [s]: 5.660 * Moon: 20 % sunlit, 128° distance * Sun: 76° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 141 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 98°) * approx speed of asteroid's shadow [km/s]: 24.8558 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 363-169220 by 173 Ino on 2022 Oct 20 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 176 0 0 13 6 21 23 34 23.0 1 108 65 12 26 9 13 46 36 12 23 48 13 48 57 .... 177 0 0 12 47 1 23 34 23.1 2 108 66 12 6 46 13 27 17 12 4 25 13 29 39 0.02 178 0 0 12 27 29 23 34 23.2 3 109 67 11 47 12 13 7 47 11 44 51 13 10 9 -0.01 179 0 0 12 7 46 23 34 23.5 4 109 67 11 27 27 12 48 6 11 25 6 12 50 28 -0.03 -180 0 0 11 47 52 23 34 23.8 5 109 68 11 7 31 12 28 14 11 5 10 12 30 36 -0.04 -179 0 0 11 27 47 23 34 24.3 6 109 68 10 47 25 12 8 12 10 45 3 12 10 33 -0.04 -178 0 0 11 7 33 23 34 24.8 7 109 68 10 27 9 11 47 59 10 24 47 11 50 21 -0.05 -177 0 0 10 47 9 23 34 25.4 8 110 69 10 6 43 11 27 37 10 4 21 11 29 59 -0.05 -176 0 0 10 26 35 23 34 26.0 9 110 69 9 46 8 11 7 5 9 43 46 11 9 27 -0.05 -175 0 0 10 5 53 23 34 26.8 10 110 69 9 25 24 10 46 24 9 23 2 10 48 46 -0.06 -174 0 0 9 45 3 23 34 27.6 11 110 69 9 4 32 10 25 35 9 2 10 10 27 57 -0.06 -173 0 0 9 24 4 23 34 28.6 12 110 70 8 43 32 10 4 38 8 41 10 10 7 0 -0.06 -172 0 0 9 2 58 23 34 29.6 13 110 70 8 22 25 9 43 33 8 20 3 9 45 56 -0.06 -171 0 0 8 41 45 23 34 30.7 14 111 70 8 1 10 9 22 21 7 58 48 9 24 44 -0.06 -170 0 0 8 20 25 23 34 31.9 15 111 70 7 39 50 9 1 3 7 37 27 9 3 25 -0.06 -169 0 0 7 58 59 23 34 33.2 16 111 70 7 18 23 8 39 38 7 16 0 8 42 1 -0.06 -168 0 0 7 37 28 23 34 34.6 17 111 70 6 56 50 8 18 8 6 54 28 8 20 30 -0.06 -167 0 0 7 15 51 23 34 36.0 18 111 69 6 35 13 7 56 32 6 32 50 7 58 54 -0.06 -166 0 0 6 54 10 23 34 37.6 19 111 69 6 13 30 7 34 51 6 11 8 7 37 14 -0.06 -165 0 0 6 32 24 23 34 39.2 20 111 69 5 51 44 7 13 6 5 49 21 7 15 29 -0.06 -164 0 0 6 10 35 23 34 40.9 22 112 69 5 29 54 6 51 17 5 27 32 6 53 40 -0.06 -163 0 0 5 48 42 23 34 42.7 23 112 68 5 8 1 6 29 25 5 5 39 6 31 48 -0.06 -162 0 0 5 26 47 23 34 44.6 24 112 68 4 46 6 6 7 31 4 43 43 6 9 53 -0.06 -161 0 0 5 4 50 23 34 46.6 25 112 67 4 24 8 5 45 33 4 21 45 5 47 56 -0.07 -160 0 0 4 42 51 23 34 48.6 26 112 67 4 2 9 5 23 35 3 59 46 5 25 58 -0.07 -159 0 0 4 20 50 23 34 50.7 27 112 66 3 40 8 5 1 34 3 37 46 5 3 57 -0.07 -158 0 0 3 58 50 23 34 53.0 28 112 66 3 18 8 4 39 34 3 15 45 4 41 57 -0.07 -157 0 0 3 36 49 23 34 55.2 29 112 65 2 56 7 4 17 33 2 53 44 4 19 55 -0.07 -156 0 0 3 14 48 23 34 57.6 30 112 64 2 34 7 3 55 32 2 31 44 3 57 55 -0.07 -155 0 0 2 52 49 23 35 0.1 31 113 64 2 12 7 3 33 32 2 9 45 3 35 55 -0.07 -154 0 0 2 30 50 23 35 2.6 32 113 63 1 50 10 3 11 33 1 47 47 3 13 56 -0.07 -153 0 0 2 8 54 23 35 5.2 33 113 62 1 28 14 2 49 37 1 25 52 2 52 0 -0.07 -152 0 0 1 47 1 23 35 7.9 34 113 62 1 6 21 2 27 43 1 3 59 2 30 5 -0.07 -151 0 0 1 25 10 23 35 10.7 35 113 61 0 44 31 2 5 51 0 42 9 2 8 14 -0.07 -150 0 0 1 3 23 23 35 13.5 37 113 60 0 22 45 1 44 3 0 20 23 1 46 26 -0.07 -149 0 0 0 41 41 23 35 16.4 38 113 59 0 1 4 1 22 20 - 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7 33 20 - 6 8 56 -0.06 - 15 0 0 - 6 33 21 23 42 53.3 6 253 -67 - 7 13 14 - 5 53 25 - 7 15 34 - 5 51 5 -0.06 - 14 0 0 - 6 15 18 23 42 53.7 5 253 -68 - 6 55 14 - 5 35 21 - 6 57 34 - 5 33 0 -0.06 - 13 0 0 - 5 57 3 23 42 54.1 4 253 -69 - 6 37 1 - 5 17 3 - 6 39 21 - 5 14 42 -0.05 - 12 0 0 - 5 38 35 23 42 54.3 3 253 -70 - 6 18 35 - 4 58 32 - 6 20 55 - 4 56 12 -0.05 - 11 0 0 - 5 19 54 23 42 54.5 2 253 -70 - 5 59 56 - 4 39 49 - 6 2 17 - 4 37 28 -0.03 - 10 0 0 - 5 1 1 23 42 54.6 1 252 -71 - 5 41 6 - 4 20 54 - 5 43 26 - 4 18 33 0.05 Uncertainty in time = +/- 1 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4 363-169220 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 55 19.9483 DE: -17 33 41.721 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 55 19.9483 DE: -17 33 41.721 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (173) Ino asteroid class: approx. diameter [km]: 141 approx. diameter ["]: 0.078 distance from Earth [AU]: 2.49580 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): 0.020", 0.002", 97.562° remarks: * orbital elements for (173)Ino : Mean anomaly = 310.3919554383 deg Arg. of pericenter = 228.8370221768 deg Long. of node = 148.1719680211 deg Inclination = 14.1997220062 deg Eccentricity = 0.2097710435 Semimajor axis = 2.7415091111 AU Perihelion dist = 2.1664198842 AU Mag: H = 8.02, G = 0.01 Epoch of elements : MJD 59872.98513889 TDT (2022 Oct 20.9851) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1132022Sep21,5.66,2022,10,20,23.644236,0.014468,0.075506,13.838740,-2.304643,0.005488,0.000660,0.000000,0.000000 -99.9114,-17.5328,-178.48,-10.60,False UCAC4 363-169220,18.92220789,-17.5615891,0.00,12.09,0.00,0.0,0,,18.94393807,-17.5327530,1.34,0.00,0,0,0 173,Ino,13.05,140.6,2.4958,0,0,3.409,-8.12,,9.0,0 0,310.1781,2022,10,20,228.8370,148.1720,14.1997,0.20977,2.74151,2.16642,8.02,5.0,0.15 1.029,0.0197,0.0022,98,0.0023,Known errors,-1.00,-1,-1,-1 20221020_169220,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org