Chandra Aspect Operations

FSS-B Performance Trending through stop=2023:042:23:59:55 (2023 Sat Feb 11 05:59:55 PM CST)

For more information on the FSS-B or historical data plots, see the FSS-B legacy trending page.

See also the Runtime information section.

Pitch Angles for Bad Data

The plots below show the sun pitch angle for data points where the FSS-B derived off-nominal roll or pitch is different from the true off-nominal roll or pitch by more than 2.0 degrees. In other words, points when the FSS is reporting erroneous values. This is an expected situation outside of the nominal FSS FOV and when the FSS Sun Presence flag is False, but is anomalous for times when FSS Sun Presence is True (which means the OBC is allowed to use the data in active safing monitors).

Long term: within 360 days Recent: within 30 days




Intervals of pitch or roll error > 2.0 deg for pitch < 136.0 deg with sun presence within 90 days

Date Duration Pitch min Pitch err max Roll err max
2023:040:23:07:01.018 12.3 135.32 -10.89 52.78

Intervals of pitch or roll error > 2.0 deg for pitch < 135.0 deg with no sun presence within 90 days

Date Duration Pitch min Pitch err max Roll err max

Interval detail plots of pitch / roll vs. time within 30 days

NOTE: FSS data (red) are only plotted when the FSS Sun Presence flag is True.

Pitch / Roll errors vs. Pitch / Roll within SPM pitch limit 135.0 deg and within 30 days

Pitch / Roll points within SPM pitch limit 135.0 deg and within 30 days

Analysis data

The scripts used in this analysis are in https://github.com/sot/fss_check.

Run information 

******************************************
Running: /export/tom/miniconda3/envs/ska3-fss-check/lib/python3.10/site-packages/fss_check/scripts/daily_fss.py
Version: 0.2.2.dev37+g4ae0b51
Time: Sun May 14 13:54:59 2023
User: aldcroft
Machine: kady.cfa.harvard.edu
Processing args:
{'cache_data': False,
 'config_dir': 'out_2023042',
 'days_long_term': 360,
 'days_recent': 30,
 'days_table': 90,
 'emails': ['taldcroft@cfa.harvard.edu'],
 'highlight_recent_days': 30.0,
 'log_level': 'INFO',
 'out': 'out_2023042',
 'stop': '2023:043',
 'use_maude': False}
******************************************

Runtime configuration file: /data/mta4/www/ASPECT/tests/fss_check3/out_2023042/fss_check_config.yml 

exclude_intervals:
- 2018:086:04:26:00.000 2018:086:04:28:00.000
- 2018:293:01:16:00.000 2018:293:01:46:00.000
- 2021:295:03:44:20.000 2021:295:03:44:30.000
- 2021:296:10:40:00.000 2021:297:00:00:00.000
- 2022:293:16:00:00.000 2022:296:16:00:00.000
- 2023:044:17:41:38.757 2023:048:03:49:31.349

spm_pitch_limit: 135.0
spm_pitch_warning: 136.0

get_large_pitch_roll_error_intervals:
  err_min: 2.0  # Minimum pitch / roll error
  dt_join: 10  # Join adjacent intervals within this time (secs)

plot_pitch_for_data_with_large_errors:
  plot_pitch_min: 120.0

plot_roll_pitch_vs_time:
  plot_errs: false

max_pitch_roll_time_plots: 10

plot_delta_vs_pitch_roll:
  err_lim: 2.0  # Allowed pitch/roll error within SPM limit

plot_pitch_roll_spm_mp_constraints:
  err_caution: 1.0
  err_warning: 2.0



Last modified:05/14/23


Aspect Operations  |  Aspect Public  |  Chandra Science |  Chandra Home |  iCXC (CXC only) | 


The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory.
60 Garden Street, Cambridge, MA 02138 USA.    Email: aspect_help@head.cfa.harvard.edu
Smithsonian Institution, Copyright © 1998-2004. All rights reserved.