IOTA/IOTA-ES occultation update for (7) Iris / TYC 6161-01552-1 event on 2023 Jan 27, 02:40 UT Visible from S Africa Summary ------- On 2023 Jan 27 UT, the 222.3 km diameter asteroid (7) Iris will occult a 11.1 mag star in the constellation Libra for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.80 mag to 11.16 mag (the magnitude of the asteroid) for at most 12.490 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 27, 02:35 - 2023 Jan 27, 02:46 * geocentric midpoint of event [JD]: 2459971.61168800 * magnitude of target star: 11.06 * magnitude drop [mag]: 0.80 * estimated maximum duration [s]: 12.490 * Moon: 34 % sunlit, 154° distance * Sun: 83° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 244 * 1 sigma uncertainty interval [path widths]: +/- 0.09 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.010", 100°) * approx speed of asteroid's shadow [km/s]: 17.8024 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6161-01552-1 by 7 Iris on 2023 Jan 27 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 - 36 0 0 - 2 44 48 2 35 24.3 0 110 -69 - 3 56 14 .. .. .. - 4 9 35 .. .. .. .... - 35 0 0 - 3 7 40 2 35 24.4 1 110 -68 - 4 19 20 - 1 56 45 - 4 32 43 - 1 43 39 0.38 - 34 0 0 - 3 31 4 2 35 24.6 2 110 -68 - 4 42 57 - 2 19 55 - 4 56 23 - 2 6 48 0.42 - 33 0 0 - 3 54 59 2 35 25.0 4 110 -67 - 5 7 6 - 2 43 38 - 5 20 34 - 2 30 28 0.43 - 32 0 0 - 4 19 26 2 35 25.6 5 110 -67 - 5 31 46 - 3 7 51 - 5 45 17 - 2 54 39 0.44 - 31 0 0 - 4 44 24 2 35 26.2 6 110 -66 - 5 56 58 - 3 32 35 - 6 10 31 - 3 19 20 0.45 - 30 0 0 - 5 9 52 2 35 27.0 7 110 -66 - 6 22 40 - 3 57 50 - 6 36 16 - 3 44 32 0.45 - 29 0 0 - 5 35 50 2 35 28.0 8 110 -65 - 6 48 53 - 4 23 34 - 7 2 32 - 4 10 14 0.45 - 28 0 0 - 6 2 18 2 35 29.1 9 110 -64 - 7 15 35 - 4 49 49 - 7 29 17 - 4 36 26 0.46 - 27 0 0 - 6 29 16 2 35 30.3 10 110 -64 - 7 42 47 - 5 16 32 - 7 56 31 - 5 3 7 0.46 - 26 0 0 - 6 56 42 2 35 31.7 11 109 -63 - 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36 -46 27 10 -49 5 10 -46 13 55 0.49 149 0 0 -47 21 11 2 46 9.3 10 251 61 -48 34 1 -46 9 7 -48 47 37 -45 55 49 0.49 150 0 0 -47 2 56 2 46 10.1 9 250 61 -48 15 59 -45 50 38 -48 29 38 -45 37 18 0.50 151 0 0 -46 44 14 2 46 11.0 9 250 61 -47 57 31 -45 31 43 -48 11 12 -45 18 20 0.50 152 0 0 -46 25 6 2 46 11.7 8 249 61 -47 38 37 -45 12 21 -47 52 21 -44 58 56 0.51 153 0 0 -46 5 31 2 46 12.4 7 248 61 -47 19 16 -44 52 33 -47 33 3 -44 39 5 0.51 154 0 0 -45 45 29 2 46 13.1 6 247 61 -46 59 29 -44 32 18 -47 13 18 -44 18 48 0.52 155 0 0 -45 25 2 2 46 13.7 6 247 61 -46 39 15 -44 11 36 -46 53 7 -43 58 4 0.53 156 0 0 -45 4 7 2 46 14.2 5 246 61 -46 18 34 -43 50 28 -46 32 28 -43 36 54 0.54 157 0 0 -44 42 46 2 46 14.6 4 245 61 -45 57 26 -43 28 54 -46 11 23 -43 15 17 0.55 158 0 0 -44 20 58 2 46 15.0 3 245 61 -45 35 52 -43 6 53 -45 49 52 -42 53 13 0.57 159 0 0 -43 58 43 2 46 15.2 2 244 61 -45 13 51 -42 44 25 -45 27 53 -42 30 43 0.61 160 0 0 -43 36 2 2 46 15.4 2 243 61 -44 51 23 -42 21 31 -45 5 28 -42 7 46 0.68 161 0 0 -43 12 54 2 46 15.6 1 242 60 -44 28 29 -41 58 10 -44 42 36 -41 44 23 0.91 162 0 0 .. .. .... .. .. .. .. .. .. -44 5 7 .. .. .. -44 19 17 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: TYC 6161-01552-1 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 37 22.2698 DE: -20 17 09.982 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 37 22.2702 DE: -20 17 09.983 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7) Iris asteroid class: ShapeModel approx. diameter [km]: 222 approx. diameter ["]: 0.109 distance from Earth [AU]: 2.81800 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#124 date of fit: 2022 Aug 03 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", 0.010", 99.908° remarks: * orbital elements for (7)Iris : Mean anomaly = 146.7660340566 deg Arg. of pericenter = 145.4072384868 deg Long. of node = 259.5060465712 deg Inclination = 5.5176851034 deg Eccentricity = 0.2296487970 Semimajor axis = 2.3869538046 AU Perihelion dist = 1.8387927348 AU Mag: H = 5.62, G = 0.15 Epoch of elements : MJD 59971.11152778 TDT (2023 Jan 27.1115) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1242022Aug03,12.49,2023,1,27,2.680512,-0.154556,-0.385061,9.334986,-3.718036,-0.005667,0.001774,0.000000,0.000000 53.3314,-20.3850,142.94,-18.55,False TYC 6161-01552-1,14.62285270,-20.2861060,0.00,11.06,0.00,0.0,0,,14.64432846,-20.3850067,0.80,0.00,0,0,0 7,Iris,11.16,222.3,2.8180,0,0,2.072,-11.60,,15.2,0 0,146.7362,2023,1,27,145.4072,259.5060,5.5177,0.22965,2.38695,1.83879,5.62,5.0,0.15 1.093,0.0120,0.0100,100,0.0101,Known errors,-1.00,-1,-1,-1 20230127_1552-1,59914.10 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org