IOTA/IOTA-ES occultation update for (2355) Nei / UCAC4 315-184229 event on 2024 Mar 22, 03:26 UT Visible from Summary ------- On 2024 Mar 22 UT, the 16.485 km diameter asteroid (2355) Nei will occult a 11.6 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 5.76 mag to 17.37 mag (the magnitude of the asteroid) for at most 0.840 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 Mar 22, 03:20 - 2024 Mar 22, 03:31 * geocentric midpoint of event [JD]: 2460391.64337471 * magnitude of target star: 11.62 * magnitude drop [mag]: 5.76 * estimated maximum duration [s]: 0.840 * Moon: 91 % sunlit, 128° distance * Sun: 87° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 96°) * approx speed of asteroid's shadow [km/s]: 19.6347 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 315-184229 by 2355 Nei on 2024 Mar 22 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 - 39 0 0 9 25 37 3 21 2.9 1 118 -76 9 20 34 9 30 40 9 18 13 9 33 2 .... - 38 0 0 8 54 16 3 21 3.1 2 118 -76 8 49 13 8 59 19 8 46 51 9 1 41 0.09 - 37 0 0 8 22 39 3 21 3.3 3 118 -75 8 17 35 8 27 43 8 15 13 8 30 5 0.06 - 36 0 0 7 50 47 3 21 3.7 4 118 -75 7 45 43 7 55 51 7 43 21 7 58 14 0.04 - 35 0 0 7 18 41 3 21 4.3 5 118 -74 7 13 36 7 23 46 7 11 14 7 26 8 0.04 - 34 0 0 6 46 22 3 21 4.9 6 118 -74 6 41 17 6 51 27 6 38 54 6 53 49 0.03 - 33 0 0 6 13 50 3 21 5.7 8 118 -73 6 8 44 6 18 55 6 6 21 6 21 18 0.03 - 32 0 0 5 41 6 3 21 6.6 9 119 -72 5 36 0 5 46 12 5 33 37 5 48 35 0.03 - 31 0 0 5 8 12 3 21 7.7 10 119 -71 5 3 5 5 13 18 5 0 42 5 15 41 0.02 - 30 0 0 4 35 7 3 21 8.8 11 119 -71 4 30 1 4 40 14 4 27 38 4 42 37 0.02 - 29 0 0 4 1 54 3 21 10.1 12 119 -70 3 56 48 4 7 1 3 54 24 4 9 24 0.02 - 28 0 0 3 28 33 3 21 11.6 13 119 -69 3 23 26 3 33 40 3 21 3 3 36 3 0.02 - 27 0 0 2 55 5 3 21 13.1 14 119 -68 2 49 58 3 0 12 2 47 34 3 2 35 0.02 - 26 0 0 2 21 31 3 21 14.8 16 119 -67 2 16 23 2 26 38 2 14 0 2 29 2 0.02 - 25 0 0 1 47 51 3 21 16.6 17 119 -66 1 42 44 1 52 59 1 40 20 1 55 23 0.02 - 24 0 0 1 14 8 3 21 18.6 18 119 -65 1 9 1 1 19 16 1 6 37 1 21 39 0.02 - 23 0 0 0 40 22 3 21 20.6 19 119 -64 0 35 14 0 45 29 0 32 50 0 47 53 0.02 - 22 0 0 0 6 34 3 21 22.8 20 119 -63 0 1 26 0 11 41 - 0 0 58 0 14 5 0.02 - 21 0 0 - 0 27 16 3 21 25.1 21 119 -62 - 0 32 23 - 0 22 8 - 0 34 47 - 0 19 44 0.01 - 20 0 0 - 1 1 5 3 21 27.6 22 119 -61 - 1 6 12 - 0 55 57 - 1 8 36 - 0 53 33 0.01 - 19 0 0 - 1 34 53 3 21 30.1 24 119 -60 - 1 40 0 - 1 29 45 - 1 42 24 - 1 27 21 0.01 - 18 0 0 - 2 8 39 3 21 32.8 25 119 -59 - 2 13 46 - 2 3 31 - 2 16 10 - 2 1 7 0.01 - 17 0 0 - 2 42 21 3 21 35.6 26 119 -58 - 2 47 29 - 2 37 14 - 2 49 52 - 2 34 50 0.01 - 16 0 0 - 3 16 0 3 21 38.6 27 119 -57 - 3 21 7 - 3 10 52 - 3 23 31 - 3 8 29 0.01 - 15 0 0 - 3 49 33 3 21 41.6 28 119 -56 - 3 54 40 - 3 44 26 - 3 57 4 - 3 42 2 0.01 - 14 0 0 - 4 23 0 3 21 44.8 29 119 -55 - 4 28 7 - 4 17 53 - 4 30 30 - 4 15 29 0.01 - 13 0 0 - 4 56 20 3 21 48.0 31 119 -54 - 5 1 26 - 4 51 13 - 5 3 50 - 4 48 49 0.01 - 12 0 0 - 5 29 31 3 21 51.4 32 119 -53 - 5 34 37 - 5 24 25 - 5 37 1 - 5 22 1 0.01 - 11 0 0 - 6 2 33 3 21 54.9 33 119 -52 - 6 7 39 - 5 57 27 - 6 10 2 - 5 55 4 0.01 - 10 0 0 - 6 35 25 3 21 58.5 34 118 -51 - 6 40 31 - 6 30 19 - 6 42 54 - 6 27 56 0.01 - 9 0 0 - 7 8 6 3 22 2.1 35 118 -50 - 7 13 11 - 7 3 0 - 7 15 34 - 7 0 37 0.01 - 8 0 0 - 7 40 34 3 22 5.9 36 118 -49 - 7 45 39 - 7 35 29 - 7 48 2 - 7 33 7 0.01 - 7 0 0 - 8 12 50 3 22 9.8 37 118 -48 - 8 17 55 - 8 7 45 - 8 20 17 - 8 5 23 0.01 - 6 0 0 - 8 44 52 3 22 13.8 39 118 -47 - 8 49 56 - 8 39 48 - 8 52 18 - 8 37 25 0.01 - 5 0 0 - 9 16 39 3 22 17.8 40 118 -46 - 9 21 42 - 9 11 35 - 9 24 5 - 9 9 13 0.01 - 4 0 0 - 9 48 10 3 22 22.0 41 118 -44 - 9 53 13 - 9 43 7 - 9 55 35 - 9 40 45 0.01 - 3 0 0 -10 19 25 3 22 26.2 42 117 -43 -10 24 27 -10 14 22 -10 26 49 -10 12 0 0.01 - 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38.7 17 246 71 -16 55 17 -16 45 30 -16 57 35 -16 43 13 0.01 123 0 0 -16 24 23 3 31 40.4 16 246 72 -16 29 17 -16 19 28 -16 31 35 -16 17 10 0.01 124 0 0 -15 57 58 3 31 42.0 15 245 73 -16 2 53 -15 53 3 -16 5 11 -15 50 44 0.02 125 0 0 -15 31 9 3 31 43.5 14 245 73 -15 36 5 -15 26 13 -15 38 23 -15 23 55 0.02 126 0 0 -15 3 58 3 31 44.8 12 245 74 -15 8 54 -14 59 1 -15 11 13 -14 56 43 0.02 127 0 0 -14 36 24 3 31 46.1 11 245 75 -14 41 21 -14 31 27 -14 43 39 -14 29 8 0.02 128 0 0 -14 8 28 3 31 47.2 10 244 75 -14 13 25 -14 3 30 -14 15 44 -14 1 11 0.02 129 0 0 -13 40 10 3 31 48.3 9 244 76 -13 45 8 -13 35 12 -13 47 28 -13 32 53 0.02 130 0 0 -13 11 32 3 31 49.2 8 244 76 -13 16 31 -13 6 33 -13 18 50 -13 4 13 0.03 131 0 0 -12 42 33 3 31 50.0 7 244 76 -12 47 33 -12 37 34 -12 49 53 -12 35 14 0.03 132 0 0 -12 13 15 3 31 50.7 6 244 77 -12 18 15 -12 8 15 -12 20 35 -12 5 55 0.03 133 0 0 -11 43 38 3 31 51.3 5 243 77 -11 48 38 -11 38 37 -11 50 59 -11 36 17 0.04 134 0 0 -11 13 42 3 31 51.8 4 243 77 -11 18 43 -11 8 41 -11 21 4 -11 6 21 0.05 135 0 0 -10 43 29 3 31 52.2 3 243 77 -10 48 30 -10 38 27 -10 50 51 -10 36 6 0.07 136 0 0 -10 12 59 3 31 52.4 2 243 77 -10 18 0 -10 7 57 -10 20 22 -10 5 35 0.11 137 0 0 - 9 42 12 3 31 52.5 0 243 77 - 9 47 14 - 9 37 10 - 9 49 36 - 9 34 48 0.38 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 315-184229 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 20 54.5694 DE: -27 06 15.452 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 20 54.5696 DE: -27 06 15.452 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.6 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2355) Nei asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.78880 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.019", 0.001", 96.3° remarks: * orbital elements for (2355)Nei : Mean anomaly = 295.0895046570 deg Arg. of pericenter = 278.3439854096 deg Long. of node = 53.7838149227 deg Inclination = 9.9949109085 deg Eccentricity = 0.1121751409 Semimajor axis = 3.0225946971 AU Perihelion dist = 2.6835347111 AU Mag: H = 11.82, G = 0.15 Epoch of elements : MJD 60391.14337454 TDT (2024 Mar 22.1434) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.84,2024,3,22,3.440993,0.000225,0.003015,10.886395,-2.075000,-0.005788,-0.000246,0.000000,0.000000 43.8595,-27.0938,130.09,0.80,False UCAC4 315-184229,18.34849147,-27.1042923,12.25,11.62,11.28,0.0,0,,18.37364482,-27.0938393,5.75,5.64,0,0,0 2355,Nei,17.37,16.485,2.7888,0,0,2.571,-6.54,,2.0,0 0,295.0626,2024,3,22,278.3440,53.7838,9.9949,0.11218,3.02259,2.68353,11.82,5.0,0.15 1.234,0.0187,0.0012,96,0.0019,Known errors,0.77,0,-1,-1 20240322_184229,60139.25 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org