IOTA/IOTA-ES occultation update for (406) Erna / UCAC4 334-195782 event on 2024 Nov 02, 09:03 UT Visible from Summary ------- On 2024 Nov 02 UT, the 46.9235551214565 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 3.97 mag to 15.62 mag (the magnitude of the asteroid) for at most 1.520 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 02, 09:00 - 2024 Nov 02, 09:07 * geocentric midpoint of event [JD]: 2460616.87765529 * magnitude of target star: 11.68 * magnitude drop [mag]: 3.97 * estimated maximum duration [s]: 1.520 * Moon: 1 % sunlit, 54° distance * Sun: 64° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 47 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.011", 80°) * approx speed of asteroid's shadow [km/s]: 31.1031 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 334-195782 by 406 Erna on 2024 Nov 2 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 13 0 0 -14 48 44 9 0 25.8 1 114 63 -15 2 49 -14 34 38 -15 15 47 -14 21 42 .... 14 0 0 -15 14 40 9 0 25.9 2 114 64 -15 28 45 -15 0 36 -15 41 41 -14 47 40 0.17 15 0 0 -15 40 23 9 0 26.0 3 113 65 -15 54 27 -15 26 20 -16 7 23 -15 13 25 0.15 16 0 0 -16 5 53 9 0 26.2 4 113 66 -16 19 56 -15 51 50 -16 32 50 -15 38 57 0.14 17 0 0 -16 31 8 9 0 26.5 5 113 67 -16 45 10 -16 17 7 -16 58 4 -16 4 14 0.13 18 0 0 -16 56 8 9 0 26.8 6 113 68 -17 10 9 -16 42 8 -17 23 2 -16 29 17 0.13 19 0 0 -17 20 54 9 0 27.3 7 112 69 -17 34 53 -17 6 54 -17 47 45 -16 54 4 0.13 20 0 0 -17 45 23 9 0 27.7 8 112 70 -17 59 21 -17 31 25 -18 12 12 -17 18 35 0.13 21 0 0 -18 9 36 9 0 28.3 9 112 71 -18 23 33 -17 55 39 -18 36 23 -17 42 51 0.13 22 0 0 -18 33 32 9 0 28.9 10 111 72 -18 47 28 -18 19 37 -19 0 17 -18 6 49 0.13 23 0 0 -18 57 11 9 0 29.6 11 111 73 -19 11 6 -18 43 17 -19 23 54 -18 30 31 0.12 24 0 0 -19 20 33 9 0 30.3 12 111 73 -19 34 27 -19 6 40 -19 47 13 -18 53 55 0.12 25 0 0 -19 43 37 9 0 31.1 13 110 74 -19 57 29 -19 29 45 -20 10 14 -19 17 1 0.12 26 0 0 -20 6 22 9 0 32.0 14 110 75 -20 20 13 -19 52 31 -20 32 56 -19 39 49 0.12 27 0 0 -20 28 48 9 0 32.9 15 110 76 -20 42 38 -20 14 59 -20 55 20 -20 2 18 0.12 28 0 0 -20 50 55 9 0 33.8 16 109 76 -21 4 44 -20 37 8 -21 17 25 -20 24 27 0.12 29 0 0 -21 12 43 9 0 34.9 17 109 77 -21 26 30 -20 58 57 -21 39 10 -20 46 18 0.12 30 0 0 -21 34 11 9 0 36.0 18 109 78 -21 47 57 -21 20 26 -22 0 35 -21 7 49 0.12 31 0 0 -21 55 19 9 0 37.1 19 108 78 -22 9 3 -21 41 36 -22 21 41 -21 28 59 0.12 32 0 0 -22 16 7 9 0 38.3 20 108 79 -22 29 50 -22 2 25 -22 42 25 -21 49 50 0.12 33 0 0 -22 36 34 9 0 39.6 21 107 79 -22 50 15 -22 22 53 -23 2 50 -22 10 20 0.12 34 0 0 -22 56 40 9 0 40.9 22 107 80 -23 10 20 -22 43 1 -23 22 53 -22 30 29 0.12 35 0 0 -23 16 25 9 0 42.2 23 107 80 -23 30 3 -23 2 47 -23 42 35 -22 50 16 0.12 36 0 0 -23 35 49 9 0 43.6 24 106 80 -23 49 25 -23 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6 53 20 9 6 56.7 23 248 -41 - 7 7 35 - 6 39 6 - 7 20 41 - 6 26 1 0.13 176 0 0 - 6 24 56 9 6 58.2 22 247 -42 - 6 39 11 - 6 10 42 - 6 52 17 - 5 57 38 0.13 177 0 0 - 5 56 32 9 6 59.7 21 247 -43 - 6 10 47 - 5 42 18 - 6 23 53 - 5 29 14 0.13 178 0 0 - 5 28 9 9 7 1.1 20 247 -44 - 5 42 23 - 5 13 55 - 5 55 29 - 5 0 51 0.13 179 0 0 - 4 59 47 9 7 2.4 19 247 -46 - 5 14 1 - 4 45 33 - 5 27 6 - 4 32 29 0.13 180 0 0 - 4 31 27 9 7 3.6 18 247 -47 - 4 45 41 - 4 17 14 - 4 58 46 - 4 4 10 0.13 -179 0 0 - 4 3 10 9 7 4.8 16 247 -48 - 4 17 24 - 3 48 57 - 4 30 28 - 3 35 54 0.13 -178 0 0 - 3 34 57 9 7 5.9 15 247 -49 - 3 49 10 - 3 20 44 - 4 2 14 - 3 7 42 0.13 -177 0 0 - 3 6 48 9 7 6.9 14 247 -50 - 3 21 1 - 2 52 36 - 3 34 4 - 2 39 34 0.13 -176 0 0 - 2 38 44 9 7 7.9 13 247 -51 - 2 52 56 - 2 24 33 - 3 5 59 - 2 11 31 0.13 -175 0 0 - 2 10 47 9 7 8.7 12 247 -52 - 2 24 58 - 1 56 36 - 2 38 0 - 1 43 34 0.14 -174 0 0 - 1 42 55 9 7 9.5 11 247 -53 - 1 57 6 - 1 28 45 - 2 10 8 - 1 15 45 0.14 -173 0 0 - 1 15 12 9 7 10.3 10 247 -54 - 1 29 22 - 1 1 2 - 1 42 23 - 0 48 2 0.14 -172 0 0 - 0 47 36 9 7 10.9 9 247 -55 - 1 1 45 - 0 33 27 - 1 14 46 - 0 20 28 0.14 -171 0 0 - 0 20 9 9 7 11.5 8 247 -57 - 0 34 17 - 0 6 1 - 0 47 17 0 6 58 0.15 -170 0 0 0 7 9 9 7 12.0 7 247 -58 - 0 6 59 0 21 16 - 0 19 58 0 34 13 0.15 -169 0 0 0 34 16 9 7 12.4 5 247 -59 0 20 10 0 48 22 0 7 11 1 1 19 0.16 -168 0 0 1 1 13 9 7 12.7 4 247 -60 0 47 7 1 15 18 0 34 10 1 28 14 0.17 -167 0 0 1 27 58 9 7 13.0 3 247 -61 1 13 54 1 42 2 1 0 57 1 54 57 0.18 -166 0 0 1 54 31 9 7 13.2 2 247 -62 1 40 28 2 8 35 1 27 32 2 21 29 0.21 -165 0 0 2 20 52 9 7 13.3 1 247 -63 2 6 50 2 34 54 1 53 55 2 47 47 0.31 -164 0 0 2 46 59 9 7 13.3 0 247 -64 2 32 58 .. .. .. 2 20 5 .. .. .. 23.11 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 334-195782 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 03 04.4617 DE: -23 19 34.763 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 03 04.4616 DE: -23 19 34.763 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (406) Erna asteroid class: approx. diameter [km]: 47 approx. diameter ["]: 0.023 distance from Earth [AU]: 2.79130 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): 0.026", 0.011", 79.594° remarks: * orbital elements for (406)Erna : Mean anomaly = 325.7143946312 deg Arg. of pericenter = 37.9215902944 deg Long. of node = 315.4367025036 deg Inclination = 4.1916280893 deg Eccentricity = 0.1779157833 Semimajor axis = 2.9176050459 AU Perihelion dist = 2.3985170588 AU Mag: H = 10.37, G = 0.15 Epoch of elements : MJD 60616.37765495 TDT (2024 Nov 02.3777) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,1.52,2024,11,2,9.063727,0.017745,-0.110126,17.318822,2.872818,0.005179,0.000548,-0.000001,0.000000 108.0526,-23.2912,39.94,-14.95,False UCAC4 334-195782,19.05123939,-23.3263229,12.56,11.68,11.20,0.1,0,,19.07604745,-23.2911905,3.97,4.00,0,0,0 406,Erna,15.62,47.126,2.7913,0,0,3.961,9.06,,2.4,0 0,325.6397,2024,11,2,37.9216,315.4367,4.1916,0.17792,2.91761,2.39852,10.36,5.0,0.15 1.459,0.0257,0.0107,80,0.0107,Known errors,0.82,0,-1,-1 20241102_195782,60140.68 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org