IOTA/IOTA-ES occultation update for (191) Kolga / TYC 0768-00476-1 event on 2023 Feb 01, 04:24 UT Visible from South America Summary ------- On 2023 Feb 01 UT, the 100.8 km diameter asteroid (191) Kolga will occult a 9.0 mag star in the constellation Canis Minor 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 4.33 mag to 13.33 mag (the magnitude of the asteroid) for at most 8.470 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 Feb 01, 04:15 - 2023 Feb 01, 04:33 * geocentric midpoint of event [JD]: 2459976.68365800 * magnitude of target star: 9.02 * magnitude drop [mag]: 4.33 * estimated maximum duration [s]: 8.470 * Moon: 82 % sunlit, 34° distance * Sun: 157° distance * rough path description: South America Additional comments ------------------- duplicate source flag The occultation path -------------------- * approximate projected width [km]: 103 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 91°) * approx speed of asteroid's shadow [km/s]: 11.8967 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0768-00476-1 by 191 Kolga on 2023 Feb 1 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 -180 0 0 17 35 2 4 33 11.7 1 79 17 18 3 30 17 6 30 18 7 20 17 2 39 .... -179 0 0 17 45 37 4 33 11.5 2 79 16 18 14 2 17 17 9 18 17 52 17 13 18 0.12 -178 0 0 17 55 39 4 33 11.1 3 80 15 18 24 1 17 27 14 18 27 51 17 23 24 0.16 -177 0 0 18 5 9 4 33 10.6 4 80 14 18 33 28 17 36 46 18 37 17 17 32 56 0.18 -176 0 0 18 14 5 4 33 10.0 5 80 14 18 42 22 17 45 45 18 46 11 17 41 56 0.19 -175 0 0 18 22 30 4 33 9.2 5 81 13 18 50 44 17 54 12 18 54 32 17 50 23 0.20 -174 0 0 18 30 21 4 33 8.2 6 81 12 18 58 34 18 2 6 19 2 22 17 58 17 0.20 -173 0 0 18 37 41 4 33 7.1 7 81 11 19 5 51 18 9 27 19 9 38 18 5 39 0.20 -172 0 0 18 44 28 4 33 5.9 8 82 10 19 12 36 18 16 16 19 16 23 18 12 28 0.21 -171 0 0 18 50 42 4 33 4.5 9 82 9 19 18 49 18 22 33 19 22 36 18 18 45 0.21 -170 0 0 18 56 25 4 33 3.0 10 82 8 19 24 30 18 28 18 19 28 17 18 24 30 0.21 -169 0 0 19 1 36 4 33 1.3 11 83 7 19 29 39 18 33 30 19 33 26 18 29 42 0.21 -168 0 0 19 6 15 4 32 59.5 12 83 6 19 34 17 18 38 10 19 38 3 18 34 23 0.21 -167 0 0 19 10 22 4 32 57.5 13 83 5 19 38 23 18 42 19 19 42 9 18 38 31 0.21 -166 0 0 19 13 58 4 32 55.4 14 84 4 19 41 57 18 45 55 19 45 43 18 42 8 0.21 -165 0 0 19 17 2 4 32 53.2 15 84 4 19 45 0 18 49 0 19 48 46 18 45 13 0.21 -164 0 0 19 19 34 4 32 50.8 16 84 3 19 47 31 18 51 33 19 51 17 18 47 46 0.21 -163 0 0 19 21 35 4 32 48.3 17 84 2 19 49 31 18 53 35 19 53 17 18 49 48 0.21 -162 0 0 19 23 4 4 32 45.6 18 85 1 19 51 0 18 55 5 19 54 46 18 51 18 0.21 -161 0 0 19 24 2 4 32 42.8 19 85 0 19 51 58 18 56 3 19 55 44 18 52 17 0.21 -160 0 0 19 24 29 4 32 39.9 20 85 -1 19 52 25 18 56 30 19 56 11 18 52 44 0.21 -159 0 0 19 24 25 4 32 36.9 20 86 -2 19 52 20 18 56 26 19 56 6 18 52 39 0.21 -158 0 0 19 23 49 4 32 33.7 21 86 -3 19 51 45 18 55 50 19 55 31 18 52 4 0.21 -157 0 0 19 22 42 4 32 30.3 22 86 -4 19 50 38 18 54 44 19 54 24 18 50 57 0.21 -156 0 0 19 21 5 4 32 26.9 23 87 -4 19 49 1 18 53 6 19 52 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15 56.5 12 293 -21 -37 38 25 -38 38 15 -37 34 23 -38 42 17 0.23 - 16 0 0 -38 26 1 4 15 54.9 11 293 -21 -37 56 13 -38 55 53 -37 52 12 -38 59 55 0.23 - 15 0 0 -38 43 16 4 15 53.5 10 292 -20 -38 13 33 -39 13 3 -38 9 33 -39 17 4 0.23 - 14 0 0 -39 0 4 4 15 52.2 9 292 -19 -38 30 26 -39 29 46 -38 26 26 -39 33 46 0.23 - 13 0 0 -39 16 23 4 15 51.0 8 291 -18 -38 46 50 -39 46 0 -38 42 51 -39 50 0 0.23 - 12 0 0 -39 32 15 4 15 49.9 8 290 -18 -39 2 47 -40 1 47 -38 58 49 -40 5 47 0.23 - 11 0 0 -39 47 40 4 15 49.0 7 290 -17 -39 18 16 -40 17 7 -39 14 19 -40 21 6 0.23 - 10 0 0 -40 2 37 4 15 48.1 6 289 -16 -39 33 18 -40 31 59 -39 29 21 -40 35 57 0.23 - 9 0 0 -40 17 6 4 15 47.4 5 288 -15 -39 47 52 -40 46 24 -39 43 56 -40 50 22 0.23 - 8 0 0 -40 31 9 4 15 46.7 4 288 -15 -40 1 59 -41 0 22 -39 58 3 -41 4 19 0.23 - 7 0 0 -40 44 44 4 15 46.2 4 287 -14 -40 15 38 -41 13 53 -40 11 43 -41 17 49 0.23 - 6 0 0 -40 57 52 4 15 45.8 3 286 -13 -40 28 51 -41 26 57 -40 24 56 -41 30 53 0.23 - 5 0 0 -41 10 34 4 15 45.5 2 286 -12 -40 41 36 -41 39 34 -40 37 42 -41 43 29 0.23 - 4 0 0 -41 22 48 4 15 45.3 1 285 -12 -40 53 55 -41 51 45 -40 50 2 -41 55 39 0.23 - 3 0 0 -41 34 36 4 15 45.2 0 284 -11 -41 5 47 -42 3 29 -41 1 54 -42 7 23 0.24 Uncertainty in time = +/- 1 secs Prediction of 2022 Dec 13.0 Data for the target star ------------------------ * name: TYC 0768-00476-1 * constellation : Canis Minor * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 27 04.0729 DE: +10 34 51.616 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 27 04.0729 DE: +10 34 51.616 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (191) Kolga asteroid class: approx. diameter [km]: 101 approx. diameter ["]: 0.071 distance from Earth [AU]: 1.94980 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#125 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): 0.009", 0.002", 90.914° remarks: * orbital elements for (191)Kolga : Mean anomaly = 82.5044462255 deg Arg. of pericenter = 226.2300392796 deg Long. of node = 159.1900300918 deg Inclination = 11.5240745670 deg Eccentricity = 0.0876706817 Semimajor axis = 2.8947516067 AU Perihelion dist = 2.6409667600 AU Mag: H = 9.03, G = 0.15 Epoch of elements : MJD 59976.18361111 TDT (2023 Feb 01.1836) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1252022Nov22,8.47,2023,2,1,4.407792,-0.106841,-0.185215,-5.814920,3.357955,0.002185,0.000759,0.000001,0.000000 -85.1540,10.5340,117.25,-17.18,False TYC 0768-00476-1,7.45113138,10.5810045,0.00,9.02,0.00,0.0,0,,7.47253379,10.5340046,4.33,0.00,0,0,0 191,Kolga,13.33,100.8,1.9498,0,0,-1.777,15.14,,5.6,0 0,82.4677,2023,2,1,226.2300,159.1900,11.5241,0.08767,2.89475,2.64097,9.04,5.0,0.15 1.067,0.0093,0.0018,91,0.0048,Known errors,-1.00,-1,-1,-1 20230201_0476-1,59926.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 13, 00:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org