The Occultation of a 13.6 star (r=13.2 combined) by Asteroid (921) Jovita (v=14.7)

Mar 22, 2025 at 11:57:07pm

OWc page

 

This is a favorable event, in that it lasts a full 4.2s, plenty of time to integrate well enough to get it. The combined image will drop to v=14.7 for up to 4.2s. It should be do-able at 4x with luck. Certainly 8x will be bright and easy.

Alt=46, Az=175 in Crater, above the "cup" level with Alphard.

 

Kirk may still be at the BD air field with the SCAC and observe from there. I will hopefully hear from him. If he's not and will be elsewhere, I may stay at home. but otherwise, I will plan to try it from "The Farm" parking lot in Soquel. Or BlueBall park; similar chord.

Karl is near the centerline. The rest of us are south of the centerline.

     

 

Results

Richard Nolthenius

 I observed from Rincon St, 20 ft NE from the mailboxes. Conditions were clear and good, calm. Integrated at 8x. Did horiz/vert median filter, 2.4px static circular apertures on all stars.

magDrop report: percentDrop: 74.6 magDrop: 1.489 +/- 0.247 (0.95 ci)

DNR: 3.27

D time: [06:57:06.7725]
D: 0.6800 containment intervals: {+/- 0.0430} seconds
D: 0.9500 containment intervals: {+/- 0.1124} seconds
D: 0.9973 containment intervals: {+/- 0.2473} seconds

R time: [06:57:09.6525]
R: 0.6800 containment intervals: {+/- 0.0430} seconds
R: 0.9500 containment intervals: {+/- 0.1124} seconds
R: 0.9973 containment intervals: {+/- 0.2473} seconds

Duration (R - D): 2.8800 seconds
Duration: 0.6800 containment intervals: {+/- 0.0638} seconds
Duration: 0.9500 containment intervals: {+/- 0.1455} seconds
Duration: 0.9973 containment intervals: {+/- 0.2911} seconds

     

 

Kirk Bender

I got an obvious 3.2 sec. event for Jovita, 16x at the Bonny Doon airport. Got some waviness from clouds, normalized on a tracking star.

magDrop report: percentDrop: 65.9  magDrop: 1.167  +/- 0.325  (0.95 ci)

DNR: 2.11

D time: [06:57:07.4147]
D: 0.6800 containment intervals:  {+/- 0.1188} seconds
D: 0.9500 containment intervals:  {+/- 0.3853} seconds
D: 0.9973 containment intervals:  {+/- 0.9225} seconds

R time: [06:57:10.6178]
R: 0.6800 containment intervals:  {+/- 0.1188} seconds
R: 0.9500 containment intervals:  {+/- 0.3853} seconds
R: 0.9973 containment intervals:  {+/- 0.9225} seconds

Duration (R - D): 3.2031 seconds
Duration: 0.6800 containment intervals:  {+/- 0.1907} seconds
Duration: 0.9500 containment intervals:  {+/- 0.5099} seconds
Duration: 0.9973 containment intervals:  {+/- 1.0781} seconds

     

 

Karl von Ahnen

March 22, 11:57:07 (921) Jovita From near "the Rock", Humidity 82%, 48deg F, Mostly clear with a few thin foggy clouds, seeing mediocre, fairly Dark. No Moon, Recorded at 8X, saw ~3sec event visually, fairly faint at mag 13.6. Processing notes: Event pretty obvious, Aperture set at 31, (but noticed 51 in aperture box on first page), Mask set at 2.4, mask threshold 2 sigmas

 


MagDrop report: percentDrop: 71.3  magDrop: 1.354  +/- 0.279  (0.95 ci)
DNR=2.48

D time: [06:57:05.7096]
D: 0.6800 containment intervals:  {+/- 0.0553} seconds
D: 0.9500 containment intervals:  {+/- 0.1677} seconds
D: 0.9973 containment intervals:  {+/- 0.4656} seconds

R time: [06:57:09.4466]
R: 0.6800 containment intervals:  {+/- 0.0553} seconds
R: 0.9500 containment intervals:  {+/- 0.1677} seconds
R: 0.9973 containment intervals:  {+/- 0.4656} seconds

Duration (R - D): 3.7370 seconds
Duration: 0.6800 containment intervals:  {+/- 0.0866} seconds
Duration: 0.9500 containment intervals:  {+/- 0.2390} seconds
Duration: 0.9973 containment intervals:  {+/- 0.5375} seconds