IOTA/IOTA-ES occultation update for (406) Erna / UCAC4 339-184720 event on 2024 Nov 17, 18:18 UT Visible from Summary ------- On 2024 Nov 17 UT, the 47.046 km diameter asteroid (406) Erna will occult a 11.7 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 4.04 mag to 15.66 mag (the magnitude of the asteroid) for at most 1.310 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: 94 * date and approx. time of event: 2024 Nov 17, 18:16 - 2024 Nov 17, 18:21 * geocentric midpoint of event [JD]: 2460632.26317167 * magnitude of target star: 11.65 * magnitude drop [mag]: 4.04 * estimated maximum duration [s]: 1.310 * Moon: 95 % sunlit, 151° distance * Sun: 55° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.010", 77°) * approx speed of asteroid's shadow [km/s]: 35.8297 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 339-184720 by 406 Erna 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 -158 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -50 13 57 .. .. .. .... -157 0 0 -49 59 56 18 16 50.2 0 125 34 -50 21 52 -49 38 9 -50 41 56 -49 18 31 .... -156 0 0 -50 27 38 18 16 50.3 1 124 35 -50 49 35 -50 5 52 -51 9 38 -49 46 14 0.86 -155 0 0 -50 55 4 18 16 50.4 2 124 35 -51 17 0 -50 33 18 -51 37 4 -50 13 41 0.90 -154 0 0 -51 22 13 18 16 50.6 3 123 36 -51 44 9 -51 0 28 -52 4 12 -50 40 51 0.92 -153 0 0 -51 49 5 18 16 50.7 4 122 36 -52 11 0 -51 27 20 -52 31 2 -51 7 43 0.93 -152 0 0 -52 15 38 18 16 51.0 4 121 37 -52 37 31 -51 53 54 -52 57 33 -51 34 18 0.94 -151 0 0 -52 41 51 18 16 51.3 5 120 37 -53 3 44 -52 20 9 -53 23 45 -52 0 34 0.95 -150 0 0 -53 7 46 18 16 51.6 6 120 38 -53 29 37 -52 46 4 -53 49 36 -52 26 31 0.95 -149 0 0 -53 33 20 18 16 51.9 7 119 38 -53 55 10 -53 11 40 -54 15 8 -52 52 8 0.95 -148 0 0 -53 58 34 18 16 52.3 7 118 38 -54 20 22 -53 36 55 -54 40 18 -53 17 25 0.96 -147 0 0 -54 23 26 18 16 52.7 8 117 39 -54 45 12 -54 1 50 -55 5 7 -53 42 21 0.96 -146 0 0 -54 47 57 18 16 53.2 9 116 39 -55 9 41 -54 26 23 -55 29 34 -54 6 56 0.96 -145 0 0 -55 12 7 18 16 53.7 9 116 40 -55 33 49 -54 50 35 -55 53 39 -54 31 10 0.96 -144 0 0 -55 35 54 18 16 54.2 10 115 40 -55 57 33 -55 14 25 -56 17 21 -54 55 2 0.96 -143 0 0 -55 59 19 18 16 54.7 11 114 40 -56 20 56 -55 37 52 -56 40 41 -55 18 32 0.96 -142 0 0 -56 22 21 18 16 55.3 11 113 41 -56 43 55 -56 0 57 -57 3 38 -55 41 39 0.96 -141 0 0 -56 45 1 18 16 55.9 12 112 41 -57 6 31 -56 23 39 -57 26 11 -56 4 24 0.96 -140 0 0 -57 7 17 18 16 56.5 13 111 41 -57 28 44 -56 45 59 -57 48 22 -56 26 46 0.96 -139 0 0 -57 29 10 18 16 57.2 13 110 41 -57 50 34 -57 7 55 -58 10 8 -56 48 45 0.96 -138 0 0 -57 50 40 18 16 57.8 14 109 42 -58 12 0 -57 29 28 -58 31 31 -57 10 21 0.96 -137 0 0 -58 11 46 18 16 58.5 15 109 42 -58 33 3 -57 50 37 -58 52 30 -57 31 34 0.97 -136 0 0 -58 32 28 18 16 59.2 15 108 42 -58 53 42 -58 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0 0 -49 46 3 18 20 18.0 34 275 -4 -50 8 1 -49 24 14 -50 28 7 -49 4 34 0.98 24 0 0 -49 17 43 18 20 20.0 33 274 -5 -49 39 41 -48 55 55 -49 59 47 -48 36 15 0.98 25 0 0 -48 49 8 18 20 21.9 33 273 -6 -49 11 6 -48 27 20 -49 31 11 -48 7 41 0.98 26 0 0 -48 20 19 18 20 23.8 32 272 -7 -48 42 17 -47 58 32 -49 2 21 -47 38 53 0.98 27 0 0 -47 51 17 18 20 25.7 32 271 -7 -48 13 14 -47 29 30 -48 33 18 -47 9 52 0.99 28 0 0 -47 22 2 18 20 27.6 31 270 -8 -47 43 58 -47 0 17 -48 4 1 -46 40 39 0.99 29 0 0 -46 52 36 18 20 29.5 30 269 -9 -47 14 31 -46 30 52 -47 34 33 -46 11 15 0.99 30 0 0 -46 22 59 18 20 31.3 29 268 -10 -46 44 52 -46 1 16 -47 4 53 -45 41 41 0.99 31 0 0 -45 53 13 18 20 33.1 29 267 -11 -46 15 4 -45 31 31 -46 35 4 -45 11 58 0.99 32 0 0 -45 23 18 18 20 34.9 28 266 -12 -45 45 8 -45 1 38 -46 5 5 -44 42 6 0.99 33 0 0 -44 53 15 18 20 36.6 27 265 -12 -45 15 3 -44 31 37 -45 34 59 -44 12 7 0.99 34 0 0 -44 23 6 18 20 38.4 27 264 -13 -44 44 52 -44 1 30 -45 4 46 -43 42 2 0.99 35 0 0 -43 52 52 18 20 40.0 26 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-38 10 24 -37 28 26 -38 29 38 -37 9 35 1.01 48 0 0 -37 19 33 18 20 57.9 15 253 -26 -37 40 32 -36 58 43 -37 59 43 -36 39 55 1.02 49 0 0 -36 49 55 18 20 58.9 14 252 -26 -37 10 50 -36 29 9 -37 29 56 -36 10 25 1.02 50 0 0 -36 20 28 18 20 59.9 13 252 -27 -36 41 18 -35 59 46 -37 0 21 -35 41 5 1.02 51 0 0 -35 51 12 18 21 0.7 12 251 -28 -36 11 58 -35 30 34 -36 30 57 -35 11 57 1.03 52 0 0 -35 22 9 18 21 1.6 11 250 -29 -35 42 50 -35 1 35 -36 1 45 -34 43 2 1.03 53 0 0 -34 53 19 18 21 2.3 10 250 -30 -35 13 56 -34 32 50 -35 32 47 -34 14 21 1.04 54 0 0 -34 24 44 18 21 3.0 9 249 -31 -34 45 17 -34 4 19 -35 4 3 -33 45 54 1.04 55 0 0 -33 56 24 18 21 3.6 8 249 -31 -34 16 52 -33 36 3 -34 35 35 -33 17 42 1.05 56 0 0 -33 28 20 18 21 4.2 7 248 -32 -33 48 44 -33 8 4 -34 7 23 -32 49 47 1.06 57 0 0 -33 0 34 18 21 4.7 6 248 -33 -33 20 54 -32 40 22 -33 39 28 -32 22 9 1.08 58 0 0 -32 33 6 18 21 5.1 5 247 -34 -32 53 21 -32 12 59 -33 11 51 -31 54 49 1.10 59 0 0 -32 5 56 18 21 5.5 4 246 -35 -32 26 7 -31 45 54 -32 44 33 -31 27 48 1.13 60 0 0 -31 39 6 18 21 5.8 3 246 -35 -31 59 12 -31 19 8 -32 17 34 -31 1 7 1.17 61 0 0 -31 12 37 18 21 6.0 2 245 -36 -31 32 39 -30 52 43 -31 50 56 -30 34 46 1.25 62 0 0 -30 46 29 18 21 6.1 1 245 -37 -31 6 26 -30 26 39 -31 24 39 -30 8 46 1.43 63 0 0 -30 20 42 18 21 6.2 1 244 -38 -30 40 35 -30 0 57 -30 58 44 -29 43 8 2.29 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 339-184720 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 28 29.0088 DE: -22 16 22.970 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 28 29.0087 DE: -22 16 22.970 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.7 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (406) Erna asteroid class: approx. diameter [km]: 47 approx. diameter ["]: 0.022 distance from Earth [AU]: 2.94080 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.025", 0.010", 77.096° remarks: * orbital elements for (406)Erna : Mean anomaly = 328.7532943154 deg Arg. of pericenter = 37.9256934870 deg Long. of node = 315.4366086353 deg Inclination = 4.1916755269 deg Eccentricity = 0.1779020250 Semimajor axis = 2.9175422092 AU Perihelion dist = 2.3985055422 AU Mag: H = 10.37, G = 0.15 Epoch of elements : MJD 60631.76317141 TDT (2024 Nov 17.7632) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,1.31,2024,11,17,18.316120,0.135246,-0.679692,19.832913,3.954465,0.004662,0.000692,-0.000001,0.000000 -39.5507,-22.2234,-98.46,-19.23,False UCAC4 339-184720,19.47472471,-22.2730472,11.89,11.65,11.52,0.0,0,,19.49920724,-22.2233723,4.04,3.72,0,0,0 406,Erna,15.66,47.046,2.9408,0,0,4.272,11.83,,2.4,0 0,328.6024,2024,11,17,37.9257,315.4366,4.1917,0.17790,2.91754,2.39851,10.36,5.0,0.15 1.454,0.0247,0.0100,77,0.0100,Known errors,1.10,0,-1,-1 20241117_184720,60140.70 ------ 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