IOTA/IOTA-ES occultation update for (1233) Kobresia / TYC 6857-02198-1 event on 2024 Oct 28, 09:21 UT Visible from Summary ------- On 2024 Oct 28 UT, the 34.348 km diameter asteroid (1233) Kobresia will occult a 11.5 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 5.22 mag to 16.69 mag (the magnitude of the asteroid) for at most 1.030 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 Oct 28, 09:18 - 2024 Oct 28, 09:24 * geocentric midpoint of event [JD]: 2460611.88989133 * magnitude of target star: 11.48 * magnitude drop [mag]: 5.22 * estimated maximum duration [s]: 1.030 * Moon: 15 % sunlit, 106° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.003", 82°) * approx speed of asteroid's shadow [km/s]: 33.3869 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6857-02198-1 by 1233 Kobresia on 2024 Oct 28 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 - 3 0 0 -29 58 15 9 18 36.0 1 116 50 -30 9 55 -29 46 36 -30 14 3 -29 42 29 .... - 2 0 0 -30 24 13 9 18 36.0 2 116 51 -30 35 52 -30 12 34 -30 40 0 -30 8 27 0.46 - 1 0 0 -30 50 2 9 18 36.2 3 115 52 -31 1 42 -30 38 24 -31 5 50 -30 34 17 0.48 0 0 0 -31 15 43 9 18 36.4 4 115 52 -31 27 23 -31 4 5 -31 31 31 -30 59 59 0.49 1 0 0 -31 41 15 9 18 36.6 5 114 53 -31 52 54 -31 29 38 -31 57 2 -31 25 31 0.49 2 0 0 -32 6 37 9 18 36.9 5 113 53 -32 18 16 -31 55 0 -32 22 24 -31 50 53 0.49 3 0 0 -32 31 49 9 18 37.3 6 113 54 -32 43 27 -32 20 12 -32 47 35 -32 16 6 0.50 4 0 0 -32 56 50 9 18 37.7 7 112 55 -33 8 28 -32 45 13 -33 12 35 -32 41 7 0.50 5 0 0 -33 21 39 9 18 38.2 8 112 55 -33 33 16 -33 10 3 -33 37 23 -33 5 56 0.50 6 0 0 -33 46 16 9 18 38.8 9 111 56 -33 57 53 -33 34 40 -34 2 0 -33 30 34 0.50 7 0 0 -34 10 40 9 18 39.3 10 111 56 -34 22 16 -33 59 5 -34 26 23 -33 54 59 0.50 8 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2 56 -25 39 39 -26 7 3 -25 35 32 0.53 -177 0 0 -25 24 26 9 24 10.8 14 251 -40 -25 36 4 -25 12 48 -25 40 12 -25 8 42 0.53 -176 0 0 -24 57 35 9 24 11.7 13 251 -41 -25 9 13 -24 45 58 -25 13 21 -24 41 52 0.54 -175 0 0 -24 30 45 9 24 12.6 12 250 -42 -24 42 23 -24 19 9 -24 46 30 -24 15 3 0.54 -174 0 0 -24 3 56 9 24 13.4 11 250 -43 -24 15 33 -23 52 20 -24 19 40 -23 48 15 0.54 -173 0 0 -23 37 9 9 24 14.1 10 249 -44 -23 48 46 -23 25 34 -23 52 53 -23 21 29 0.55 -172 0 0 -23 10 26 9 24 14.7 9 249 -45 -23 22 1 -22 58 51 -23 26 8 -22 54 46 0.55 -171 0 0 -22 43 45 9 24 15.3 8 249 -46 -22 55 20 -22 32 12 -22 59 27 -22 28 6 0.56 -170 0 0 -22 17 10 9 24 15.8 7 248 -47 -22 28 44 -22 5 37 -22 32 50 -22 1 32 0.56 -169 0 0 -21 50 39 9 24 16.3 6 248 -48 -22 2 12 -21 39 7 -22 6 18 -21 35 2 0.57 -168 0 0 -21 24 14 9 24 16.6 5 248 -49 -21 35 46 -21 12 43 -21 39 52 -21 8 38 0.59 -167 0 0 -20 57 56 9 24 17.0 4 247 -50 -21 9 27 -20 46 25 -21 13 32 -20 42 21 0.61 -166 0 0 -20 31 45 9 24 17.2 3 247 -50 -20 43 15 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6857-02198-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 26 05.0904 DE: -22 49 22.168 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 26 05.0904 DE: -22 49 22.168 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.300) * V mag [mag]: 11.5 * B mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1233) Kobresia asteroid class: approx. diameter [km]: 34 approx. diameter ["]: 0.017 distance from Earth [AU]: 2.75510 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", 81.94° remarks: * orbital elements for (1233)Kobresia : Mean anomaly = 28.9882943516 deg Arg. of pericenter = 333.2719885046 deg Long. of node = 291.3756790802 deg Inclination = 5.6010848609 deg Eccentricity = 0.0560897178 Semimajor axis = 2.5555497507 AU Perihelion dist = 2.4122096865 AU Mag: H = 11.54, G = 0.15 Epoch of elements : MJD 60611.38989112 TDT (2024 Oct 28.3899) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.03,2024,10,28,9.357392,0.044177,-0.444462,18.750509,1.879716,0.004992,0.000260,-0.000001,0.000000 99.3162,-22.8094,35.58,-13.34,False TYC 6857-02198-1,18.43474739,-22.8228245,11.74,11.48,11.34,0.0,0,,18.45954803,-22.8093917,5.22,4.91,0,0,0 1233,Kobresia,16.69,34.348,2.7551,0,0,4.328,6.00,,1.8,0 0,28.8942,2024,10,28,333.2720,291.3757,5.6011,0.05609,2.55555,2.41221,11.53,5.0,0.15 1.177,0.0093,0.0030,82,0.0030,Known errors,1.19,0,-1,-1 20241028_2198-1,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org