IOTA/IOTA-ES occultation update for (406) Erna / UCAC4 339-184123 event on 2024 Nov 16, 13:09 UT Visible from Summary ------- On 2024 Nov 16 UT, the 47.066 km diameter asteroid (406) Erna will occult a 11.1 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 4.63 mag to 15.66 mag (the magnitude of the asteroid) for at most 1.330 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 16, 13:06 - 2024 Nov 16, 13:12 * geocentric midpoint of event [JD]: 2460631.04826079 * magnitude of target star: 11.05 * magnitude drop [mag]: 4.63 * estimated maximum duration [s]: 1.330 * Moon: 99 % sunlit, 133° distance * Sun: 56° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 47 * 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]: 35.4780 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 339-184123 by 406 Erna on 2024 Nov 16 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 - 53 0 0 - 5 57 35 13 6 30.6 0 112 56 - 6 11 26 - 5 43 44 - 6 23 57 - 5 31 13 .... - 52 0 0 - 6 22 14 13 6 30.6 1 112 57 - 6 36 4 - 6 8 24 - 6 48 33 - 5 55 54 0.06 - 51 0 0 - 6 46 37 13 6 30.8 2 112 58 - 7 0 26 - 6 32 48 - 7 12 54 - 6 20 19 0.00 - 50 0 0 - 7 10 45 13 6 30.9 3 112 59 - 7 24 32 - 6 56 57 - 7 36 59 - 6 44 29 -0.03 - 49 0 0 - 7 34 35 13 6 31.2 4 112 60 - 7 48 22 - 7 20 49 - 8 0 48 - 7 8 22 -0.04 - 48 0 0 - 7 58 9 13 6 31.4 6 112 61 - 8 11 54 - 7 44 24 - 8 24 19 - 7 31 58 -0.05 - 47 0 0 - 8 21 26 13 6 31.8 7 112 62 - 8 35 9 - 8 7 42 - 8 47 33 - 7 55 17 -0.05 - 46 0 0 - 8 44 24 13 6 32.2 8 112 63 - 8 58 7 - 8 30 41 - 9 10 29 - 8 18 18 -0.06 - 45 0 0 - 9 7 4 13 6 32.7 9 111 64 - 9 20 45 - 8 53 23 - 9 33 7 - 8 41 1 -0.06 - 44 0 0 - 9 29 26 13 6 33.2 10 111 65 - 9 43 6 - 9 15 46 - 9 55 26 - 9 3 25 -0.06 - 43 0 0 - 9 51 28 13 6 33.8 11 111 66 -10 5 7 - 9 37 50 -10 17 26 - 9 25 30 -0.06 - 42 0 0 -10 13 11 13 6 34.5 12 111 67 -10 26 48 - 9 59 34 -10 39 6 - 9 47 15 -0.07 - 41 0 0 -10 34 34 13 6 35.2 13 111 68 -10 48 10 -10 20 58 -11 0 27 -10 8 41 -0.07 - 40 0 0 -10 55 37 13 6 36.0 14 111 69 -11 9 11 -10 42 2 -11 21 27 -10 29 46 -0.07 - 39 0 0 -11 16 19 13 6 36.8 15 110 70 -11 29 52 -11 2 46 -11 42 6 -10 50 31 -0.07 - 38 0 0 -11 36 41 13 6 37.7 16 110 72 -11 50 12 -11 23 9 -12 2 25 -11 10 55 -0.07 - 37 0 0 -11 56 41 13 6 38.6 17 110 73 -12 10 11 -11 43 11 -12 22 23 -11 30 58 -0.07 - 36 0 0 -12 16 20 13 6 39.6 18 110 74 -12 29 49 -12 2 51 -12 41 59 -11 50 40 -0.07 - 35 0 0 -12 35 37 13 6 40.6 19 110 75 -12 49 4 -12 22 9 -13 1 13 -12 9 59 -0.07 - 34 0 0 -12 54 32 13 6 41.7 20 109 76 -13 7 58 -12 41 6 -13 20 6 -12 28 57 -0.07 - 33 0 0 -13 13 5 13 6 42.8 21 109 77 -13 26 29 -12 59 40 -13 38 36 -12 47 32 -0.07 - 32 0 0 -13 31 15 13 6 44.0 22 109 78 -13 44 38 -13 17 52 -13 56 44 -13 5 45 -0.07 - 31 0 0 -13 49 3 13 6 45.3 23 109 79 -14 2 25 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0 27 25 1 21 6 -0.08 92 0 0 1 22 5 13 12 1.1 32 242 -23 1 7 58 1 36 11 0 55 14 1 48 57 -0.08 93 0 0 1 49 59 13 12 3.0 31 242 -24 1 35 53 2 4 6 1 23 8 2 16 52 -0.08 94 0 0 2 17 58 13 12 4.7 30 242 -25 2 3 51 2 32 5 1 51 6 2 44 51 -0.08 95 0 0 2 46 0 13 12 6.5 29 243 -26 2 31 52 3 0 7 2 19 7 3 12 53 -0.08 96 0 0 3 14 3 13 12 8.1 28 243 -27 2 59 56 3 28 11 2 47 10 3 40 58 -0.08 97 0 0 3 42 9 13 12 9.7 27 243 -28 3 28 1 3 56 17 3 15 16 4 9 4 -0.08 98 0 0 4 10 15 13 12 11.2 26 243 -30 3 56 7 4 24 24 3 43 22 4 37 10 -0.08 99 0 0 4 38 22 13 12 12.7 24 243 -31 4 24 14 4 52 30 4 11 28 5 5 17 -0.07 100 0 0 5 6 28 13 12 14.1 23 243 -32 4 52 20 5 20 36 4 39 34 5 33 23 -0.07 101 0 0 5 34 32 13 12 15.5 22 243 -33 5 20 24 5 48 41 5 7 39 6 1 27 -0.07 102 0 0 6 2 35 13 12 16.7 21 243 -34 5 48 27 6 16 43 5 35 41 6 29 29 -0.07 103 0 0 6 30 34 13 12 18.0 20 243 -35 6 16 26 6 44 42 6 3 41 6 57 28 -0.07 104 0 0 6 58 30 13 12 19.1 19 244 -36 6 44 22 7 12 38 6 31 37 7 25 24 -0.07 105 0 0 7 26 21 13 12 20.2 18 244 -37 7 12 14 7 40 29 6 59 29 7 53 15 -0.07 106 0 0 7 54 8 13 12 21.2 17 244 -38 7 40 1 8 8 15 7 27 16 8 21 0 -0.07 107 0 0 8 21 48 13 12 22.2 16 244 -39 8 7 42 8 35 55 7 54 58 8 48 40 -0.07 108 0 0 8 49 23 13 12 23.1 15 244 -40 8 35 17 9 3 29 8 22 33 9 16 14 -0.07 109 0 0 9 16 49 13 12 23.9 13 244 -42 9 2 44 9 30 55 8 50 0 9 43 40 -0.07 110 0 0 9 44 9 13 12 24.7 12 244 -43 9 30 4 9 58 14 9 17 21 10 10 58 -0.07 111 0 0 10 11 19 13 12 25.4 11 245 -44 9 57 15 10 25 24 9 44 32 10 38 7 -0.07 112 0 0 10 38 20 13 12 26.0 10 245 -45 10 24 17 10 52 24 10 11 35 11 5 7 -0.07 113 0 0 11 5 12 13 12 26.6 9 245 -46 10 51 9 11 19 15 10 38 28 11 31 57 -0.07 114 0 0 11 31 53 13 12 27.1 8 245 -47 11 17 51 11 45 56 11 5 10 11 58 37 -0.07 115 0 0 11 58 23 13 12 27.5 7 245 -48 11 44 22 12 12 25 11 31 42 12 25 5 -0.06 116 0 0 12 24 41 13 12 27.9 6 246 -49 12 10 41 12 38 42 11 58 2 12 51 22 -0.06 117 0 0 12 50 47 13 12 28.2 5 246 -50 12 36 48 13 4 47 12 24 9 13 17 26 -0.06 118 0 0 13 16 40 13 12 28.5 4 246 -51 13 2 42 13 30 39 12 50 4 13 43 18 -0.05 119 0 0 13 42 20 13 12 28.7 3 246 -52 13 28 23 13 56 18 13 15 46 14 8 56 -0.04 120 0 0 14 7 46 13 12 28.8 2 246 -53 13 53 49 14 21 43 13 41 14 14 34 20 -0.02 121 0 0 14 32 58 13 12 28.8 1 247 -54 14 19 2 14 46 53 14 6 27 14 59 29 0.08 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 339-184123 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 26 24.6986 DE: -22 22 02.504 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 26 24.6984 DE: -22 22 02.504 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.1 * B mag [mag]: 11.3 * 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]: 2.92960 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", 77.295° remarks: * orbital elements for (406)Erna : Mean anomaly = 328.5133302079 deg Arg. of pericenter = 37.9253659140 deg Long. of node = 315.4366146027 deg Inclination = 4.1916716361 deg Eccentricity = 0.1779031965 Semimajor axis = 2.9175474402 AU Perihelion dist = 2.3985064246 AU Mag: H = 10.37, G = 0.15 Epoch of elements : MJD 60630.54826046 TDT (2024 Nov 16.5483) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,1.33,2024,11,16,13.158259,-0.016196,0.081945,19.648852,3.861910,0.004695,0.000680,-0.000001,0.000000 38.4972,-22.3189,-21.16,-18.94,False UCAC4 339-184123,19.44019410,-22.3673621,11.34,11.05,10.89,0.0,0,,19.46470240,-22.3188675,4.62,4.33,0,0,0 406,Erna,15.66,47.066,2.9296,0,0,4.251,11.60,,2.4,0 0,328.4049,2024,11,16,37.9254,315.4366,4.1917,0.17790,2.91755,2.39851,10.36,5.0,0.15 1.452,0.0247,0.0100,77,0.0100,Known errors,0.73,0,-1,-1 20241116_184123,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org