IOTA/IOTA-ES occultation update for (85) Io / TYC 4896-00120-1 event on 2023 Jan 03, 04:35 UT Visible from E Canada, USA Summary ------- On 2023 Jan 03 UT, the 159.5 km diameter asteroid (85) Io will occult a 11.4 mag star in the constellation Sextans for observers along a path across E Canada, USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.88 mag to 13.10 mag (the magnitude of the asteroid) for at most 26.320 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: 2023 Jan 03, 04:25 - 2023 Jan 03, 04:45 * geocentric midpoint of event [JD]: 2459947.69122659 * magnitude of target star: 11.43 * magnitude drop [mag]: 1.88 * estimated maximum duration [s]: 26.320 * Moon: 87 % sunlit, 93° distance * Sun: 128° distance * rough path description: E Canada, USA Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 314 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.002", 105°) * approx speed of asteroid's shadow [km/s]: 6.0592 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4896-00120-1 by 85 Io on 2023 Jan 3 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 Alt E. Longitude Latitude U.T. Alt Az Alt Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude .. .. .. .. .. .. .. .. .... .. .. .. 55 7 53 71 15 52 ... .. .. .. .. .. 51 17 6 70 49 44 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. 47 20 3 70 40 30 ... .. .. .. .. .. 45 18 5 70 19 41 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. 42 31 20 70 13 47 ... .. .. .. .. .. 41 2 48 69 54 45 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. 38 46 32 69 50 20 ... .. .. .. .. .. 37 35 55 69 32 19 ... .. .. .. .. .. .... 50 48 12 72 23 58 4 26 37.3 3 250 -14 35 37 39 69 28 47 ... .. .. .. .. .. 34 38 53 69 11 32 ... .. .. .. .. .. .... 44 7 19 71 50 45 4 26 43.2 5 244 -16 32 52 48 69 8 37 ... .. .. .. .. .. 32 2 28 68 51 56 ... .. .. .. .. .. -1.38 39 32 12 71 23 47 4 26 49.2 7 240 -17 30 25 18 68 49 28 ... .. .. .. .. .. 29 41 25 68 33 15 ... .. .. .. .. .. -1.53 35 52 21 70 59 43 4 26 55.2 8 236 -18 28 11 7 68 31 8 ... .. .. .. .. .. 27 32 20 68 15 19 ... .. .. .. .. .. -1.59 32 45 48 70 37 30 4 27 1.1 9 233 -19 26 7 33 68 13 29 48 28 52 73 44 11 25 32 56 67 58 1 53 46 58 74 17 22 -1.62 30 1 58 70 16 38 4 27 7.1 10 231 -19 24 12 40 67 56 26 41 45 46 73 9 37 23 41 33 67 41 16 44 19 5 73 34 40 -1.64 27 34 53 69 56 47 4 27 13.1 11 228 -20 22 25 5 67 39 52 37 4 57 72 41 13 21 56 57 67 24 59 38 53 14 73 3 48 -1.66 25 20 50 69 37 47 4 27 19.0 12 226 -21 20 43 44 67 23 46 33 20 22 72 15 52 20 18 10 67 9 8 34 44 42 72 36 59 -1.67 23 17 13 69 19 29 4 27 25.0 12 224 -22 19 7 46 67 8 4 30 9 46 71 52 28 18 44 26 66 53 40 31 18 52 72 12 34 -1.68 21 22 14 69 1 48 4 27 31.0 13 223 -22 17 36 30 66 52 44 27 22 34 71 30 30 17 15 10 66 38 32 28 20 51 71 49 49 -1.68 19 34 30 68 44 38 4 27 36.9 14 221 -23 16 9 25 66 37 44 24 52 40 71 9 38 15 49 51 66 23 44 25 42 48 71 28 19 -1.69 17 52 59 68 27 57 4 27 42.9 14 219 -23 14 46 2 66 23 2 22 36 13 70 49 41 14 28 3 66 9 14 23 19 55 71 7 49 -1.69 16 16 51 68 11 42 4 27 48.9 15 218 -24 13 25 59 66 8 37 20 30 35 70 30 30 13 9 25 65 54 59 21 9 5 70 48 9 -1.70 14 45 26 67 55 49 4 27 54.8 16 216 -25 12 8 56 65 54 28 18 33 52 70 11 58 11 53 40 65 41 0 19 8 3 70 29 12 -1.70 13 18 11 67 40 18 4 28 0.8 16 215 -25 10 54 37 65 40 34 16 44 38 69 54 0 10 40 33 65 27 15 17 15 10 70 10 52 -1.70 11 54 39 67 25 6 4 28 6.8 17 213 -26 9 42 48 65 26 54 15 1 50 69 36 34 9 29 49 65 13 44 15 29 13 69 53 5 -1.71 10 34 29 67 10 12 4 28 12.7 17 212 -26 8 33 16 65 13 27 13 24 35 69 19 35 8 21 16 65 0 25 13 49 15 69 35 48 -1.71 9 17 19 66 55 35 4 28 18.7 18 211 -27 7 25 51 65 0 12 11 52 12 69 3 2 7 14 46 64 47 19 12 14 29 69 18 57 -1.71 8 2 55 66 41 14 4 28 24.7 18 210 -27 6 20 21 64 47 9 10 24 7 68 46 51 6 10 8 64 34 23 10 44 18 69 2 31 -1.71 6 51 1 66 27 8 4 28 30.6 18 208 -28 5 16 40 64 34 16 8 59 51 68 31 2 5 7 14 64 21 38 9 18 9 68 46 27 -1.71 5 41 24 66 13 16 4 28 36.6 19 207 -28 4 14 39 64 21 35 7 39 1 68 15 32 4 5 57 64 9 4 7 55 38 68 30 43 -1.71 4 33 54 65 59 36 4 28 42.6 19 206 -29 3 14 12 64 9 3 6 21 17 68 0 21 3 6 11 63 56 39 6 36 24 68 15 19 -1.72 3 28 22 65 46 9 4 28 48.5 20 205 -29 2 15 12 63 56 41 5 6 22 67 45 27 2 7 49 63 44 24 5 20 6 68 0 12 -1.72 2 24 37 65 32 54 4 28 54.5 20 204 -29 1 17 33 63 44 29 3 54 1 67 30 49 1 10 47 63 32 18 4 6 29 67 45 23 -1.72 1 22 34 65 19 50 4 29 0.5 20 203 -30 0 21 12 63 32 25 2 44 0 67 16 25 0 14 59 63 20 20 2 55 20 67 30 49 -1.72 0 22 4 65 6 57 4 29 6.4 21 202 -30 - 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86 8 50 45 38 6 - 92 58 26 48 0 32 - 85 49 48 45 30 8 - 93 29 52 48 9 23 -1.74 - 90 9 15 46 43 20 4 43 7.7 14 109 -61 - 87 0 55 45 33 37 - 94 11 3 47 56 47 - 86 41 13 45 25 39 - 94 44 50 48 5 44 -1.74 - 91 11 11 46 39 13 4 43 13.6 13 108 -61 - 87 54 35 45 29 14 - 95 28 48 47 53 18 - 87 34 9 45 21 14 - 96 5 31 48 2 22 -1.75 - 92 16 4 46 35 16 4 43 19.6 13 108 -60 - 88 50 2 45 24 57 - 96 53 6 47 50 9 - 88 28 48 45 16 56 - 97 33 41 47 59 23 -1.75 - 93 24 28 46 31 31 4 43 25.6 12 107 -60 - 89 47 31 45 20 47 - 98 26 9 47 47 25 - 89 25 22 45 12 44 - 99 12 6 47 56 53 -1.76 - 94 37 5 46 27 58 4 43 31.5 11 106 -59 - 90 47 18 45 16 45 -100 11 41 47 45 17 - 90 24 6 45 8 39 -101 5 51 47 55 7 -1.77 - 95 54 56 46 24 41 4 43 37.5 10 105 -58 - 91 49 45 45 12 51 -102 17 15 47 44 6 - 91 25 21 45 4 43 -103 26 27 47 54 37 -1.78 - 97 19 27 46 21 44 4 43 43.5 9 104 -58 - 92 55 17 45 9 7 -105 3 35 47 44 49 - 92 29 29 45 0 56 -106 57 32 47 57 23 -1.79 - 98 52 55 46 19 13 4 43 49.4 8 103 -57 - 94 4 31 45 5 35 ... .. .. .. .. .. - 93 37 3 44 57 19 ... .. .. .. .. .. -1.81 -100 39 18 46 17 19 4 43 55.4 7 101 -56 - 95 18 14 45 2 16 ... .. .. .. .. .. - 94 48 43 44 53 55 ... .. .. .. .. .. -1.85 -102 46 39 46 16 25 4 44 1.4 6 100 -55 - 96 37 32 44 59 14 ... .. .. .. .. .. - 96 5 28 44 50 47 ... .. .. .. .. .. -1.92 -105 38 12 46 17 33 4 44 7.3 4 98 -53 - 98 4 5 44 56 33 ... .. .. .. .. .. - 97 28 41 44 47 57 ... .. .. .. .. .. -2.15 .. .. .. .. .. .. .. .. .... .. .. .. - 99 40 31 44 54 21 ... .. .. .. .. .. - 99 0 30 44 45 33 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. -101 31 38 44 52 50 ... .. .. .. .. .. -100 44 36 44 43 44 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. -103 47 59 44 52 31 ... .. .. .. .. .. -102 48 16 44 42 50 ... .. .. .. .. .. .... .. .. .. .. .. .. .. .. .... .. .. .. -107 6 43 44 55 4 ... .. .. .. .. .. -105 31 27 44 43 46 ... .. .. .. .. .. .... Uncertainty in time = +/- 3 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: TYC 4896-00120-1 * constellation : Sextans * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 57 36.0319 DE: -02 29 51.719 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 57 36.0321 DE: -02 29 51.721 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (85) Io asteroid class: approx. diameter [km]: 160 approx. diameter ["]: 0.090 distance from Earth [AU]: 2.45390 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#118 date of fit: 2022 Nov 22 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): 0.010", 0.002", 105.398° remarks: * orbital elements for (85)Io : Mean anomaly = 168.2457419683 deg Arg. of pericenter = 122.8949409801 deg Long. of node = 203.0521183533 deg Inclination = 11.9612350563 deg Eccentricity = 0.1938957938 Semimajor axis = 2.6530718929 AU Perihelion dist = 2.1386524122 AU Mag: H = 7.84, G = 0.15 Epoch of elements : MJD 59947.19118056 TDT (2023 Jan 03.1912) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182022Nov22,26.32,2023,1,3,4.589438,-0.199339,0.838236,-3.327582,-0.789550,-0.003983,0.002508,0.000001,0.000000 -21.6969,-2.6065,112.22,-22.85,False TYC 4896-00120-1,9.96000886,-2.4976997,0.00,11.43,0.00,0.0,0,,9.97954242,-2.6065023,1.88,0.00,0,0,0 85,Io,13.10,159.5,2.4539,0,0,-0.796,-2.83,,8.0,0 0,168.2021,2023,1,3,122.8949,203.0521,11.9612,0.19390,2.65307,2.13865,7.85,5.0,0.15 1.059,0.0100,0.0024,105,0.0052,Known errors,-1.00,-1,-1,-1 20230103_0120-1,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org