IOTA/IOTA-ES occultation update for (1233) Kobresia / UCAC4 342-174750 event on 2024 Nov 17, 20:20 UT Visible from Summary ------- On 2024 Nov 17 UT, the 34.3194132119548 km diameter asteroid (1233) Kobresia will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.88 mag to 16.76 mag (the magnitude of the asteroid) for at most 0.890 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: 99 * date and approx. time of event: 2024 Nov 17, 20:17 - 2024 Nov 17, 20:23 * geocentric midpoint of event [JD]: 2460632.34745104 * magnitude of target star: 11.89 * magnitude drop [mag]: 4.88 * estimated maximum duration [s]: 0.890 * Moon: 94 % sunlit, 158° distance * Sun: 49° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.003", 78°) * approx speed of asteroid's shadow [km/s]: 38.7591 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 342-174750 by 1233 Kobresia on 2024 Nov 17 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 -164 0 0 3 36 18 20 17 39.4 0 112 48 3 25 58 3 46 38 3 22 8 3 50 29 .... -163 0 0 3 12 21 20 17 39.4 1 112 49 3 2 2 3 22 41 2 58 12 3 26 31 -0.04 -162 0 0 2 48 38 20 17 39.5 2 112 50 2 38 20 2 58 56 2 34 30 3 2 46 -0.12 -161 0 0 2 25 7 20 17 39.7 4 112 51 2 14 50 2 35 25 2 11 0 2 39 15 -0.15 -160 0 0 2 1 51 20 17 39.9 5 112 52 1 51 34 2 12 7 1 47 45 2 15 57 -0.17 -159 0 0 1 38 48 20 17 40.2 6 112 53 1 28 33 1 49 4 1 24 44 1 52 54 -0.18 -158 0 0 1 16 1 20 17 40.5 7 112 54 1 5 46 1 26 16 1 1 57 1 30 5 -0.18 -157 0 0 0 53 28 20 17 40.9 8 112 55 0 43 14 1 3 43 0 39 26 1 7 31 -0.19 -156 0 0 0 31 12 20 17 41.4 9 112 56 0 20 59 0 41 25 0 17 11 0 45 14 -0.19 -155 0 0 0 9 11 20 17 41.9 10 112 57 - 0 1 1 0 19 24 - 0 4 48 0 23 12 -0.20 -154 0 0 - 0 12 32 20 17 42.5 11 112 58 - 0 22 43 - 0 2 21 - 0 26 31 0 1 27 -0.20 -153 0 0 - 0 33 59 20 17 43.1 12 112 59 - 0 44 9 - 0 23 48 - 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38 0 0 1 51 30 20 22 9.9 45 236 -2 1 41 13 2 1 48 1 37 24 2 5 38 -0.22 - 37 0 0 2 14 52 20 22 12.1 44 236 -3 2 4 35 2 25 10 2 0 45 2 29 1 -0.22 - 36 0 0 2 38 29 20 22 14.3 43 237 -4 2 28 10 2 48 48 2 24 20 2 52 38 -0.22 - 35 0 0 3 2 19 20 22 16.5 42 237 -5 2 51 59 3 12 38 2 48 9 3 16 29 -0.22 - 34 0 0 3 26 22 20 22 18.6 41 237 -6 3 16 2 3 36 42 3 12 11 3 40 34 -0.22 - 33 0 0 3 50 38 20 22 20.7 40 237 -7 3 40 17 4 0 59 3 36 26 4 4 51 -0.22 - 32 0 0 4 15 6 20 22 22.7 39 238 -8 4 4 44 4 25 28 4 0 53 4 29 20 -0.22 - 31 0 0 4 39 46 20 22 24.7 38 238 -9 4 29 23 4 50 8 4 25 32 4 54 0 -0.22 - 30 0 0 5 4 36 20 22 26.6 37 238 -10 4 54 13 5 15 0 4 50 21 5 18 52 -0.22 - 29 0 0 5 29 37 20 22 28.5 36 238 -12 5 19 13 5 40 1 5 15 21 5 43 53 -0.22 - 28 0 0 5 54 47 20 22 30.4 35 238 -13 5 44 23 6 5 12 5 40 31 6 9 5 -0.22 - 27 0 0 6 20 7 20 22 32.1 34 239 -14 6 9 42 6 30 32 6 5 50 6 34 25 -0.22 - 26 0 0 6 45 35 20 22 33.9 33 239 -15 6 35 9 6 56 1 6 31 17 6 59 54 -0.22 - 25 0 0 7 11 11 20 22 35.6 31 239 -16 7 0 45 7 21 37 6 56 52 7 25 30 -0.22 - 24 0 0 7 36 54 20 22 37.2 30 239 -17 7 26 27 7 47 21 7 22 34 7 51 14 -0.22 - 23 0 0 8 2 43 20 22 38.8 29 239 -18 7 52 16 8 13 10 7 48 22 8 17 4 -0.22 - 22 0 0 8 28 38 20 22 40.3 28 240 -19 8 18 10 8 39 6 8 14 17 8 43 0 -0.22 - 21 0 0 8 54 38 20 22 41.8 27 240 -20 8 44 10 9 5 6 8 40 17 9 9 0 -0.22 - 20 0 0 9 20 43 20 22 43.2 26 240 -21 9 10 14 9 31 11 9 6 21 9 35 6 -0.22 - 19 0 0 9 46 51 20 22 44.6 25 240 -22 9 36 22 9 57 20 9 32 29 10 1 14 -0.22 - 18 0 0 10 13 3 20 22 45.9 24 241 -23 10 2 34 10 23 32 9 58 40 10 27 26 -0.22 - 17 0 0 10 39 16 20 22 47.2 23 241 -24 10 28 47 10 49 46 10 24 53 10 53 40 -0.22 - 16 0 0 11 5 32 20 22 48.4 22 241 -26 10 55 2 11 16 2 10 51 8 11 19 56 -0.22 - 15 0 0 11 31 48 20 22 49.5 21 241 -27 11 21 19 11 42 18 11 17 25 11 46 13 -0.22 - 14 0 0 11 58 5 20 22 50.6 20 242 -28 11 47 36 12 8 36 11 43 41 12 12 30 -0.22 - 13 0 0 12 24 22 20 22 51.7 19 242 -29 12 13 52 12 34 52 12 9 58 12 38 47 -0.22 - 12 0 0 12 50 37 20 22 52.6 17 242 -30 12 40 7 13 1 8 12 36 13 13 5 3 -0.22 - 11 0 0 13 16 51 20 22 53.6 16 242 -31 13 6 21 13 27 22 13 2 27 13 31 16 -0.22 - 10 0 0 13 43 3 20 22 54.4 15 243 -32 13 32 33 13 53 33 13 28 38 13 57 28 -0.22 - 9 0 0 14 9 11 20 22 55.2 14 243 -33 13 58 41 14 19 41 13 54 47 14 23 36 -0.22 - 8 0 0 14 35 16 20 22 56.0 13 243 -34 14 24 46 14 45 46 14 20 52 14 49 41 -0.22 - 7 0 0 15 1 16 20 22 56.6 12 243 -35 14 50 46 15 11 46 14 46 52 15 15 41 -0.22 - 6 0 0 15 27 11 20 22 57.3 11 244 -36 15 16 42 15 37 41 15 12 48 15 41 36 -0.22 - 5 0 0 15 53 1 20 22 57.8 10 244 -37 15 42 32 16 3 31 15 38 38 16 7 26 -0.22 - 4 0 0 16 18 45 20 22 58.3 9 244 -38 16 8 15 16 29 14 16 4 21 16 33 9 -0.22 - 3 0 0 16 44 21 20 22 58.8 8 244 -39 16 33 52 16 54 50 16 29 58 16 58 45 -0.22 - 2 0 0 17 9 50 20 22 59.2 7 245 -40 16 59 22 17 20 19 16 55 28 17 24 13 -0.22 - 1 0 0 17 35 11 20 22 59.5 6 245 -41 17 24 43 17 45 40 17 20 49 17 49 34 -0.22 0 0 0 18 0 24 20 22 59.8 5 245 -42 17 49 56 18 10 52 17 46 2 18 14 46 -0.21 1 0 0 18 25 27 20 23 0.0 4 246 -43 18 14 59 18 35 54 18 11 6 18 39 48 -0.21 2 0 0 18 50 20 20 23 0.2 3 246 -44 18 39 53 19 0 47 18 36 0 19 4 41 -0.21 3 0 0 19 15 3 20 23 0.3 2 246 -45 19 4 36 19 25 30 19 0 43 19 29 23 -0.20 4 0 0 19 39 35 20 23 0.4 1 247 -46 19 29 9 19 50 1 19 25 16 19 53 55 -0.18 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 342-174750 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 02 43.2519 DE: -21 46 30.835 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 02 43.2519 DE: -21 46 30.835 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.9 * B mag [mag]: 13.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1233) Kobresia asteroid class: approx. diameter [km]: 34 approx. diameter ["]: 0.016 distance from Earth [AU]: 2.97250 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 date of fit: 2023 Apr 24 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", 0.003", 78.32° remarks: * orbital elements for (1233)Kobresia : Mean anomaly = 33.9382229118 deg Arg. of pericenter = 333.2572887548 deg Long. of node = 291.3757817037 deg Inclination = 5.6011531668 deg Eccentricity = 0.0560724869 Semimajor axis = 2.5554902591 AU Perihelion dist = 2.4121975651 AU Mag: H = 11.54, G = 0.15 Epoch of elements : MJD 60631.84745091 TDT (2024 Nov 17.8475) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.89,2024,11,17,20.338825,-0.034112,0.216832,21.624538,3.311992,0.004291,0.000529,-0.000001,0.000000 -76.4149,-21.7401,-128.80,-19.25,False UCAC4 342-174750,19.04534780,-21.7752320,13.16,11.89,11.20,0.1,0,,19.06983908,-21.7401339,4.88,5.12,0,0,1 1233,Kobresia,16.76,34.535,2.9725,0,0,4.592,9.80,,1.8,0 0,33.7338,2024,11,17,333.2573,291.3758,5.6012,0.05607,2.55549,2.41220,11.53,5.0,0.15 1.186,0.0090,0.0030,78,0.0030,Known errors,1.00,0,-1,-1 20241117_174750,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org