IOTA/IOTA-ES occultation update for (268) Adorea / UCAC4 373-071976 event on 2023 Feb 06, 13:28 UT Visible from W USA Summary ------- On 2023 Feb 06 UT, the 144.7 km diameter asteroid (268) Adorea will occult a 12.4 mag star in the constellation Libra for observers along a path across W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.63 mag to 13.75 mag (the magnitude of the asteroid) for at most 7.300 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 06, 13:24 - 2023 Feb 06, 13:31 * geocentric midpoint of event [JD]: 2459982.06123571 * magnitude of target star: 12.39 * magnitude drop [mag]: 1.63 * estimated maximum duration [s]: 7.300 * Moon: 99 % sunlit, 84° distance * Sun: 86° distance * rough path description: W USA The occultation path -------------------- * approximate projected width [km]: 254 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.001", 106°) * approx speed of asteroid's shadow [km/s]: 19.8214 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 373-071976 by 268 Adorea on 2023 Feb 6 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 Alt E. Longitude Latitude U.T. Alt Az Alt Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude .. .. .. .. .. .. .. .. .... .. .. .. ... .. .. .. .. .. -162 41 17 60 44 18 ... .. .. .. .. .. -161 42 11 60 19 9 .... .. .. .. .. .. .. .. .. .... .. .. .. ... .. .. .. .. .. -158 2 51 59 5 32 ... .. .. .. .. .. -157 37 7 58 51 33 .... .. .. .. .. .. .. .. .. .... .. .. .. ... .. .. .. .. .. -155 16 15 58 4 8 ... .. .. .. .. .. -154 58 27 57 52 53 .... -160 22 42 61 19 16 13 25 9.9 3 130 -37 ... .. .. .. .. .. -153 6 57 57 15 27 ... .. .. .. .. .. -152 53 6 57 5 36 .... -156 13 19 59 48 46 13 25 11.7 5 134 -36 ... .. .. .. .. .. -151 18 15 56 33 55 ... .. .. .. .. .. -151 6 53 56 24 57 -1.07 -153 33 51 58 48 56 13 25 13.5 7 136 -36 ... .. .. .. .. .. -149 42 56 55 57 5 ... .. .. .. .. .. -149 33 17 55 48 45 -1.24 -151 28 20 58 0 53 13 25 15.4 8 138 -35 -158 48 12 62 12 48 -148 17 16 55 23 40 -159 55 6 62 41 52 -148 8 54 55 15 49 -1.30 -149 42 0 57 19 37 13 25 17.2 10 140 -35 -154 40 50 60 41 25 -146 58 56 54 52 55 -155 8 41 60 56 57 -146 51 33 54 45 27 -1.33 -148 8 27 56 42 55 13 25 19.0 11 141 -35 -152 2 26 59 40 57 -145 46 24 54 24 18 -152 21 28 59 53 20 -145 39 49 54 17 8 -1.35 -146 44 9 56 9 36 13 25 20.8 12 142 -34 -149 57 35 58 52 23 -144 38 36 53 57 25 -150 12 15 59 3 9 -144 32 41 53 50 32 -1.37 -145 26 56 55 38 53 13 25 22.7 12 144 -34 -148 11 51 58 10 42 -143 34 46 53 32 2 -148 23 51 58 20 27 -143 29 24 53 25 22 -1.38 -144 15 19 55 10 16 13 25 24.5 13 145 -33 -146 38 50 57 33 40 -142 34 16 53 7 56 -146 48 57 57 42 42 -142 29 23 53 1 28 -1.38 -143 8 19 54 43 24 13 25 26.3 14 146 -33 -145 14 59 57 0 2 -141 36 41 52 44 56 -145 23 44 57 8 32 -141 32 13 52 38 38 -1.39 -142 5 9 54 18 0 13 25 28.1 15 147 -32 -143 58 10 56 29 4 -140 41 37 52 22 55 -144 5 51 56 37 8 -140 37 30 52 16 47 -1.40 -141 5 16 53 53 53 13 25 29.9 15 147 -32 -142 46 56 56 0 13 -139 48 46 52 1 47 -142 53 45 56 7 56 -139 44 59 51 55 47 -1.40 -140 8 13 53 30 52 13 25 31.8 16 148 -31 -141 40 16 55 33 9 -138 57 55 51 41 27 -141 46 22 55 40 34 -138 54 25 51 35 34 -1.40 -139 13 37 53 8 50 13 25 33.6 17 149 -31 -140 37 25 55 7 34 -138 8 50 51 21 49 -140 42 55 55 14 44 -138 5 35 51 16 3 -1.41 -138 21 13 52 47 41 13 25 35.4 17 150 -31 -139 37 49 54 43 17 -137 21 21 51 2 50 -139 42 48 54 50 13 -137 18 20 50 57 10 -1.41 -137 30 44 52 27 19 13 25 37.2 18 151 -30 -138 41 1 54 20 8 -136 35 19 50 44 27 -138 45 34 54 26 52 -136 32 31 50 38 53 -1.41 -136 42 1 52 7 40 13 25 39.1 18 151 -30 -137 46 40 53 57 58 -135 50 37 50 26 39 -137 50 50 54 4 32 -135 48 1 50 21 10 -1.41 -135 54 51 51 48 40 13 25 40.9 19 152 -29 -136 54 28 53 36 41 -135 7 7 50 9 20 -136 58 18 53 43 6 -135 4 42 50 3 56 -1.41 -135 9 7 51 30 17 13 25 42.7 19 153 -29 -136 4 12 53 16 13 -134 24 45 49 52 30 -136 7 43 53 22 30 -134 22 30 49 47 10 -1.42 -134 24 41 51 12 26 13 25 44.5 20 153 -29 -135 15 40 52 56 28 -133 43 24 49 36 6 -135 18 55 53 2 37 -133 41 18 49 30 51 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.. .. - 46 45 26 37 18 55 -1.57 - 40 31 52 39 56 52 13 31 11.0 5 245 31 ... .. .. .. .. .. - 45 14 55 37 41 21 ... .. .. .. .. .. - 45 26 32 37 35 0 -1.66 - 36 52 23 40 53 47 13 31 12.8 2 247 31 ... .. .. .. .. .. - 43 44 14 38 0 54 ... .. .. .. .. .. - 43 57 47 37 54 0 -2.34 .. .. .. .. .. .. .. .. .... .. .. .. ... .. .. .. .. .. - 41 57 10 38 25 16 ... .. .. .. .. .. - 42 13 55 38 17 25 .... .. .. .. .. .. .. .. .. .... .. .. .. ... .. .. .. .. .. - 39 39 8 38 58 38 ... .. .. .. .. .. - 40 2 39 38 48 50 .... .. .. .. .. .. .. .. .. .... .. .. .. ... .. .. .. .. .. - 35 16 40 40 7 56 ... .. .. .. .. .. - 36 27 29 39 44 30 .... Uncertainty in time = +/- 3 secs Prediction of 2022 Dec 13.0 Data for the target star ------------------------ * name: UCAC4 373-071976 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 15 49.7352 DE: -15 27 22.330 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 15 49.7353 DE: -15 27 22.331 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (268) Adorea asteroid class: approx. diameter [km]: 145 approx. diameter ["]: 0.078 distance from Earth [AU]: 2.56440 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#75 date of fit: 2022 Nov 25 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): 0.027", 0.001", 105.995° remarks: * orbital elements for (268)Adorea : Mean anomaly = 15.1497879264 deg Arg. of pericenter = 68.3249117574 deg Long. of node = 120.8510367598 deg Inclination = 2.4402979035 deg Eccentricity = 0.1367506684 Semimajor axis = 3.0938010333 AU Perihelion dist = 2.6707216740 AU Mag: H = 8.51, G = 0.15 Epoch of elements : MJD 59981.56118056 TDT (2023 Feb 06.5612) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#752022Nov25,7.30,2023,2,6,13.469657,0.170970,0.804213,10.942670,-2.328991,-0.005646,0.001533,0.000000,0.000000 -109.1936,-15.5414,-18.54,-15.59,False UCAC4 373-071976,15.26381530,-15.4562028,0.00,12.39,0.00,0.0,0,,15.28512310,-15.5414051,1.63,0.00,0,0,0 268,Adorea,13.75,144.7,2.5644,0,0,2.597,-7.99,,7.8,0 0,15.0481,2023,2,6,68.3249,120.8510,2.4403,0.13675,3.09380,2.67072,8.51,5.0,0.15 1.028,0.0267,0.0012,106,0.0022,Known errors,-1.00,-1,-1,-1 20230206_071976,59926.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 13, 00:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org