(101) Helena
Orbital Elements
The following orbital elements are taken from MPO 50329(101) Helena Epoch 2008 Nov. 30.0 TT = JDT 2454800.5 Goffin M 291.92341 (2000.0) P Q n 0.23753464 Peri. 347.78240 +0.87765857 +0.47662844 a 2.5821695 Node 343.46518 -0.42348066 +0.72191650 e 0.1421026 Incl. 10.20163 -0.22445392 +0.50165914 P 4.15 H 8.33 G 0.35 U 0 From 589 observations at 55 oppositions, 1868-2003, mean residual 0".56.An explanation of the orbital elements is available.
These orbital elements are also available in forms suitable for loading into a number of popular planetarium-type software programs.
Ephemeris
The following ephemeris is at intervals of five days. A daily ephemeris covering the same time interval is also available.Personalized ephemerides for this object (and others) can be generated using the MPES.
Date TT R. A. (2000) Decl. Delta r Elong. Phase V 2009 06 20 22 14.16 -20 51.3 1.554 2.245 120.3 23.0 11.9 2009 06 25 22 15.77 -20 41.0 1.503 2.242 124.6 21.9 11.8 2009 06 30 22 16.61 -20 33.2 1.455 2.239 129.0 20.7 11.7 2009 07 05 22 16.66 -20 27.7 1.410 2.236 133.6 19.2 11.6 2009 07 10 22 15.90 -20 24.4 1.368 2.233 138.4 17.6 11.5 2009 07 15 22 14.32 -20 23.0 1.330 2.231 143.4 15.8 11.4 2009 07 20 22 11.93 -20 23.1 1.297 2.228 148.6 13.8 11.2 2009 07 25 22 08.77 -20 24.1 1.269 2.226 153.9 11.6 11.1 2009 07 30 22 04.92 -20 25.3 1.246 2.224 159.2 9.3 11.0 2009 08 04 22 00.48 -20 26.0 1.228 2.222 164.5 7.0 10.9 2009 08 09 21 55.61 -20 25.4 1.216 2.221 169.5 4.8 10.8 2009 08 14 21 50.44 -20 23.0 1.211 2.219 172.9 3.2 10.7 2009 08 19 21 45.15 -20 18.1 1.211 2.218 172.3 3.5 10.7 2009 08 24 21 39.95 -20 10.2 1.218 2.217 168.2 5.3 10.8 2009 08 29 21 35.02 -19 59.1 1.231 2.217 163.1 7.6 10.9 2009 09 03 21 30.53 -19 44.7 1.250 2.216 157.7 10.0 11.0 2009 09 08 21 26.63 -19 27.0 1.274 2.216 152.2 12.2 11.1 2009 09 13 21 23.41 -19 06.2 1.304 2.216 146.9 14.4 11.3 2009 09 18 21 20.95 -18 42.6 1.339 2.216 141.6 16.4 11.4 2009 09 23 21 19.31 -18 16.4 1.378 2.216 136.5 18.1 11.5 2009 09 28 21 18.50 -17 47.7 1.421 2.217 131.6 19.7 11.6 2009 10 03 21 18.52 -17 16.9 1.468 2.218 126.9 21.2 11.7 2009 10 08 21 19.34 -16 44.2 1.518 2.219 122.3 22.4 11.8
