IOTA/IOTA-ES occultation update for (191) Kolga / UCAC4-493-047480 event on 2023 Jan 08, 03:17 UT Visible from South America Summary ------- On 2023 Jan 08 UT, the 100.8 km diameter asteroid (191) Kolga will occult a 12.5 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 1.16 mag to 13.16 mag (the magnitude of the asteroid) for at most 7.990 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 08, 03:10 - 2023 Jan 08, 03:25 * geocentric midpoint of event [JD]: 2459952.63728183 * magnitude of target star: 12.46 * magnitude drop [mag]: 1.16 * estimated maximum duration [s]: 7.990 * Moon: 99 % sunlit, 18° distance * Sun: 164° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 120 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.002", 92°) * approx speed of asteroid's shadow [km/s]: 12.6111 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-493-047480 by 191 Kolga on 2023 Jan 8 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 -129 0 0 -14 12 13 3 24 47.0 0 81 -4 -13 39 22 -14 45 15 -13 36 27 -14 48 14 .... -128 0 0 -14 3 39 3 24 46.9 1 81 -5 -13 30 51 -14 36 40 -13 27 55 -14 39 38 0.38 -127 0 0 -13 55 30 3 24 46.5 2 81 -6 -13 22 44 -14 28 28 -13 19 48 -14 31 26 0.49 -126 0 0 -13 47 45 3 24 46.0 3 80 -7 -13 15 1 -14 20 41 -13 12 6 -14 23 38 0.54 -125 0 0 -13 40 24 3 24 45.3 4 80 -8 -13 7 42 -14 13 18 -13 4 47 -14 16 16 0.56 -124 0 0 -13 33 28 3 24 44.5 5 80 -9 -13 0 48 -14 6 20 -12 57 53 -14 9 17 0.58 -123 0 0 -13 26 56 3 24 43.4 6 80 -10 -12 54 17 -13 59 46 -12 51 23 -14 2 43 0.59 -122 0 0 -13 20 48 3 24 42.2 7 80 -11 -12 48 12 -13 53 37 -12 45 17 -13 56 34 0.60 -121 0 0 -13 15 5 3 24 40.9 8 79 -12 -12 42 30 -13 47 53 -12 39 36 -13 50 49 0.60 -120 0 0 -13 9 47 3 24 39.3 9 79 -12 -12 37 13 -13 42 33 -12 34 19 -13 45 29 0.61 -119 0 0 -13 4 53 3 24 37.6 10 79 -13 -12 32 21 -13 37 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0 284 15 -49 44 15 -50 51 2 -49 41 17 -50 54 2 0.91 Uncertainty in time = +/- 1 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4-493-047480 * constellation : Canis Minor * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 46 53.0466 DE: +08 28 04.459 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 46 53.0466 DE: +08 28 04.459 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (191) Kolga asteroid class: approx. diameter [km]: 101 approx. diameter ["]: 0.073 distance from Earth [AU]: 1.90380 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): 0.010", 0.002", 91.585° remarks: * orbital elements for (191)Kolga : Mean anomaly = 77.7117684364 deg Arg. of pericenter = 226.2099423367 deg Long. of node = 159.1897494009 deg Inclination = 11.5241334095 deg Eccentricity = 0.0876758391 Semimajor axis = 2.8946639466 AU Perihelion dist = 2.6408718561 AU Mag: H = 9.03, G = 0.15 Epoch of elements : MJD 59952.13722222 TDT (2023 Jan 08.1372) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1252022Nov22,7.99,2023,1,8,3.294764,-0.169084,-0.511758,-6.758671,2.233180,-0.000773,0.001433,0.000001,0.000000 -39.8090,8.4112,132.19,-22.29,False UCAC4-493-047480,7.78140182,8.4679055,0.00,12.46,0.00,0.0,0,,7.80240570,8.4112379,1.16,0.00,0,0,0 191,Kolga,13.16,100.8,1.9038,0,0,-2.103,10.32,,5.6,0 0,77.6843,2023,1,8,226.2099,159.1897,11.5241,0.08768,2.89466,2.64087,9.04,5.0,0.15 1.045,0.0097,0.0018,92,0.0033,Known errors,-1.00,-1,-1,-1 20230108_047480,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org