The Occultation of a W=13.9 Star by Asteroid (1254) Erfordia

Wed eve Jan 15 at 9:12:25pm

OWc page

This is the second in a "two-fer" asteroid occultation evening. The target is faint, at W=13.9, but the duration is long at 3.8 seconds and the gibbous moon is low and 43 degrees away, so integration can be generous enough to get this. The altitude is high, at 60 degrees. I've set an icon at Twin Gates for these two events, otherwise I'm on top of Kirk Bender at his home. There are 6 declared stations for this event, so it could end up being well observed and perhaps show some surprises, with this many chords.

Results:

Richard Nolthenius

I recorded this from Twin Gates upper UCSC, at 32x. The target star was easy to see at 32x and did disappear for about 3s on the visual monitor.  I used 3.0 px static circular masks, horiz/vert median filtering,

magDrop report: percentDrop: 67.8 magDrop: 1.229 +/- 0.221 (0.95 ci)

DNR: 5.04

D time: [05:12:25.1851]
D: 0.6800 containment intervals: {+/- 0.1074} seconds
D: 0.9500 containment intervals: {+/- 0.2477} seconds
D: 0.9973 containment intervals: {+/- 0.5092} seconds

R time: [05:12:28.6824]
R: 0.6800 containment intervals: {+/- 0.1074} seconds
R: 0.9500 containment intervals: {+/- 0.2477} seconds
R: 0.9973 containment intervals: {+/- 0.5092} seconds

Duration (R - D): 3.4973 seconds
Duration: 0.6800 containment intervals: {+/- 0.1547} seconds
Duration: 0.9500 containment intervals: {+/- 0.3420} seconds
Duration: 0.9973 containment intervals: {+/- 0.6073} seconds

Kirk Bender

Observed from home. Also saw a positive occultation I got a 3.2 sec positive for Erfordia at home, 16x, 19 minutes after Valentaugustus.


magDrop report: percentDrop: 73.8  magDrop: 1.455  +/- 0.428  (0.95 ci)

DNR: 2.92

D time: [05:12:24.9731]
D: 0.6800 containment intervals:  {+/- 0.0893} seconds
D: 0.9500 containment intervals:  {+/- 0.2562} seconds
D: 0.9973 containment intervals:  {+/- 0.7090} seconds

R time: [05:12:28.1763]
R: 0.6800 containment intervals:  {+/- 0.0893} seconds
R: 0.9500 containment intervals:  {+/- 0.2562} seconds
R: 0.9973 containment intervals:  {+/- 0.7090} seconds

Duration (R - D): 3.2032 seconds
Duration: 0.6800 containment intervals:  {+/- 0.1413} seconds
Duration: 0.9500 containment intervals:  {+/- 0.3476} seconds
Duration: 0.9973 containment intervals:  {+/- 0.8659} seconds

Karl von Ahnen

Observed from home at WaterTruck Turn. (files saved in my usual folder and usual bigger files ones in the kva folder on external HDD).