Event Descriptions

CAP from iFOT database

Event definition: CAP from iFOT database

Fields

Field

Type

Description

ifot_id

Integer

iFOT identifier

start

Char(21)

Start time (date)

stop

Char(21)

Stop time (date)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

num

Char(15)

CAP number

title

Text

CAP title

descr

Text

CAP description

notes

Text

CAP notes

link

Char(250)

CAP link

ACA dark current calibration event

Event definition: interval where CIUMACAC = ON

CIUMACAC is the IU MODE ACA CALIBRATION INDICATOR. Individual intervals within one day are joined together to a single calibration event.

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

ACA dark current calibration replica

Event definition: interval where CIUMACAC = ON

CIUMACAC is the IU MODE ACA CALIBRATION INDICATOR.

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

DSN comm period

Event definition: DSN comm pass beginning of support to end of support (not

beginning / end of track).

Fields

Field

Type

Description

ifot_id

Integer

iFOT identifier

start

Char(21)

Start time (date)

stop

Char(21)

Stop time (date)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

bot

Char(4)

Beginning of track

eot

Char(4)

End of track

activity

Char(30)

Activity description

config

Char(10)

Configuration

data_rate

Char(9)

Data rate

site

Char(12)

DSN site

soe

Char(4)

DSN Sequence Of Events

station

Char(6)

DSN station

oc

Char(30)

OC crew

cc

Char(30)

CC crew

pass_plan

OneToOne

Pass plan

Momentum unload either ground commanded or autonomous

Event definition: interval where AOUNLOAD = GRND or AOUNLOAD = AUTO

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

type

Char(4)

Momentum unload type (GRND AUTO)

Dwell in Kalman mode

Event definition: contiguous interval of AOACASEQ = KALM between:

Start: AOACASEQ ==> KALM  (transition from any state to KALM)
Stop:  AOACASEQ ==> not KALM (transition to any state other than KALM)
              **or**
       AOPCADMD ==> NMAN

Short Kalman dwells that are less than 400 seconds long are ignored and are not recorded in the database. These are typically associated with monitor window commanding or multiple acquisition attempts).

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

rel_tstart

Float

Start time relative to manvr end (sec)

manvr

ForeignKey

Maneuver that contains this dwell

ra

Float

Right ascension (deg)

dec

Float

Declination (deg)

roll

Float

Roll angle (deg)

Eclipse

Event definition: interval where AOECLIPS = ECL

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

SIM FA translation

Event definition: interval where 3FAMOVE = MOVE

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

start_3fapos

Integer

Start FA position (steps)

stop_3fapos

Integer

Stop FA position (steps)

Grating movement (HETG or LETG)

Event definition: interval with 4MP28AV > 2.0 V (MCE A + 28 VOLT MONITOR)

This event detects grating motion via the MCE-A 28 volt monitor. Due to changes in the on-board software over the years, this appears to be the most reliable method.

Short movements of less than 4 seconds are classified with grating=BUMP. In a handful of cases in 2000, there are intervals with 4MP28AV > 2.0 where no grating motion is seen. These have grating=UNKN (unknown).

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

start_4lposaro

Float

Start LETG position (degrees)

stop_4lposaro

Float

Stop LETG position (degrees)

start_4hposaro

Float

Start HETG position (degrees)

stop_4hposaro

Float

Stop HETG position (degrees)

grating

Char(4)

Grating in motion (UNKN LETG HETG BUMP)

direction

Char(4)

Grating direction (UNKN INSR RETR)

Load segment

Event definition: Load segment from iFOT database

Fields

Field

Type

Description

ifot_id

Integer

iFOT identifier

start

Char(21)

Start time (date)

stop

Char(21)

Stop time (date)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

name

Char(12)

Load segment name

scs

Integer

SCS slot

load_name

Char(10)

Load name

comment

Text

Comment

LTT bad intervals

Fields

Field

Type

Description

key

Char(38)

Unique key for this event

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

msid

Char(20)

MSID

flag

Char(2)

Flag

Major event

Event definition: events from the two lists maintained by the FOT and

the FDB (systems engineering).

Two lists of major event related to Chandra are available on OCCweb:

These two event lists are scraped from OCCweb and merged into a single list with a common structure. Unlike most kadi event types, the MajorEvent class does not represent an interval of time (start and stop) but only has start (YYYY:DOY) and date (YYYY-Mon-DD) attributes to indicate the time.

Fields

Field

Type

Description

key

Char(24)

Unique key for this event

start

Char(8)

Event time to the nearest day (YYYY:DOY)

date

Char(11)

Event time to the nearest day (YYYY-Mon-DD)

tstart

Float

Event time to the nearest day (CXC sec)

descr

Text

Event description

note

Text

Note (comments or CAP # or FSW PR #)

source

Char(3)

Event source (FDB or FOT)

Maneuver

Event definition: interval where AOFATTMD = MNVR (spacecraft actually maneuvering)

The maneuver event includes a number of attributes that give a detailed characterization of the timing and nature of the maneuver and corresponding star acquisitions and normal point model dwells.

The start and stop time attributes for a maneuver event correspond exactly to the start and stop of the actual maneuver. However, the full maneuver event contains information covering a larger time span from the end of the previous maneuver to the start of the next maneuver:

Previous maneuver
                       <---- Start of included information
  Previous MANV end
  Previous NPNT start

  ==> Maneuver <==

  Star acquisition
  Transition to KALM
  Kalman dwell
    Optional: more dwells, star acq sequences, NMAN/NPNT

  Transition to NMAN
  Transition to MANV
                       <---- End of included information
Next maneuver

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

prev_manvr_stop

Char(21)

Stop time of previous AOFATTMD=MNVR before manvr

prev_npnt_start

Char(21)

Start time of previous AOPCADMD=NPNT before manvr

nman_start

Char(21)

Start time of AOPCADMD=NMAN for manvr

manvr_start

Char(21)

Start time of AOFATTMD=MNVR for manvr

manvr_stop

Char(21)

Stop time of AOFATTMD=MNVR for manvr

npnt_start

Char(21)

Start time of AOPCADMD=NPNT after manvr

acq_start

Char(21)

Start time of AOACASEQ=AQXN after manvr

guide_start

Char(21)

Start time of AOACASEQ=GUID after manvr

kalman_start

Char(21)

Start time of AOACASEQ=KALM after manvr

aca_proc_act_start

Char(21)

Start time of AOPSACPR=ACT after manvr

npnt_stop

Char(21)

Stop time of AOPCADMD=NPNT after manvr

next_nman_start

Char(21)

Start time of next AOPCADMD=NMAN after manvr

next_manvr_start

Char(21)

Start time of next AOFATTMD=MNVR after manvr

n_dwell

Integer

Number of kalman dwells after manvr and before next manvr

n_acq

Integer

Number of AQXN intervals after manvr and before next manvr

n_guide

Integer

Number of GUID intervals after manvr and before next manvr

n_kalman

Integer

Number of KALM intervals after manvr and before next manvr

anomalous

Boolean

Key MSID shows off-nominal value

template

Char(16)

Matched maneuver template

start_ra

Float

Start right ascension before manvr

start_dec

Float

Start declination before manvr

start_roll

Float

Start roll angle before manvr

stop_ra

Float

Stop right ascension after manvr

stop_dec

Float

Stop declination after manvr

stop_roll

Float

Stop roll angle after manvr

angle

Float

Maneuver angle (deg)

one_shot

Float

One shot attitude update (arcsec)

one_shot_roll

Float

One shot attitude update roll (arcsec)

one_shot_pitch

Float

One shot attitude update pitch (arcsec)

one_shot_yaw

Float

One shot attitude update yaw (arcsec)
n_acq, n_guide, and n_kalman: these provide a count of the number of times

after the maneuver ends that AOACASEQ changes value from anything to AQXN, GUID, and KALM respectively.

anomalous: this is True if the following MSIDs have values that are

not in the list of nominal state values:

MSID

Nominal state values

AOPCADMD

NPNT NMAN

AOACASEQ

GUID KALM AQXN

AOFATTMD

MNVR STDY

AOPSACPR

INIT INAC ACT

AOUNLOAD

MON GRND
template: this indicates which of the pre-defined maneuver sequence templates were

matched by this maneuver. For details see Maneuver sequence templates.

one_shot: one shot attitude update following maneuver. This is -99.0 for maneuvers

with no corresponding transition to NPM.

one_shot_roll, one_shot_pitch, and one_shot_yaw are the values of AOATTER1, 2, and 3

from samples after the guide transition.

Maneuver sequence event

Each entry in this table corresponds to a state transition for an MSID that is relevant to the sequence of events comprising a maneuver event.

Fields

Field

Type

Description

manvr

ForeignKey

msid

Char(8)

prev_val

Char(4)

val

Char(4)

date

Char(21)

dt

Float

time

Float

prev_date

Char(21)

prev_time

Float

Normal sun mode event

Event definition: interval when PCAD mode AOPCADMD = NSUN

During a safing event and recovery this MSID can toggle to different values, so NormalSun events within 4 hours of each other are merged.

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

Observation identifier

Event definition: interval where COBSRQID is unchanged.

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

Orbit

Event definition: single Chandra orbit starting from ascending node crossing

Full orbit, with dates corresponding to start (ORBIT ASCENDING NODE CROSSING), stop, apogee, perigee, radzone start and radzone stop. Radzone is defined as the time covering perigee when radmon is disabled by command. This corresponds to the planned values and may differ from actual in the case of events that run SCS107 and prematurely disable RADMON.

Fields

Field

Type

Description

start

Char(21)

Start time (orbit ascending node crossing)

stop

Char(21)

Stop time (next orbit ascending node crossing)

tstart

Float

Start time (orbit ascending node crossing)

tstop

Float

Stop time (next orbit ascending node crossing)

dur

Float

Orbit duration (sec)

orbit_num

Integer

Orbit number

perigee

Char(21)

Perigee time

apogee

Char(21)

Apogee time

t_perigee

Float

Perigee time (CXC sec)

start_radzone

Char(21)

Start time of rad zone

stop_radzone

Char(21)

Stop time of rad zone

dt_start_radzone

Float

Start time of rad zone relative to perigee (sec)

dt_stop_radzone

Float

Stop time of rad zone relative to perigee (sec)

Orbit point

Fields

Field

Type

Description

orbit

ForeignKey

date

Char(21)

name

Char(9)

orbit_num

Integer

descr

Char(50)

Pass plan

Event definition: Pass plan from iFOT

Fields

Field

Type

Description

ifot_id

Integer

iFOT identifier

start

Char(21)

Start time (date)

stop

Char(21)

Stop time (date)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

oc

Char(30)

OC crew

cc

Char(30)

CC crew

got

Char(30)

GOT crew

station

Char(6)

DSN station

est_datetime

Char(20)

Date local

sched_support_time

Char(13)

Support time

activity

Char(20)

Activity

bot

Char(4)

Beginning of track

eot

Char(4)

End of track

data_rate

Char(10)

Data rate

config

Char(8)

Configuration

lga

Char(1)

LGA

power

Char(6)

Power

rxa_rsl

Char(10)

Rx-A RSL

rxb_rsl

Char(10)

Rx-B RSL

err_log

Char(10)

Error log

cmd_count

Char(15)

Command count

Radiation zone

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

orbit

ForeignKey

orbit_num

Integer

perigee

Char(21)

Safe sun event

Event definition: interval from safe mode entry to recovery to OBC control.

Specifically, it is considered part of the safe mode condition if any of the following are True:

CONLOFP != 'NRML'  # OFP state
CTUFMTSL = 'FMT5'  # CTU telemetry format
C1SQAX != 'ENAB'   # Sequencer A enable/disable

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

notes

Text

SCS107 run

Event definition: interval with the following combination of state values:

3TSCMOVE = MOVE
AORWBIAS = DISA
CORADMEN = DISA

These MSIDs are first sampled onto a common time sequence of 32.8 sec samples so the start / stop times are accurate only to that resolution.

Early in the mission there were two SIM TSC translations during an SCS107 run. By the above rules this would generate two SCS107 events, but instead any two SCS107 events within 600 seconds are combined into a single event.

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

notes

Text

Supplemental notes

SIM TSC translation

Event definition: interval where 3TSCMOVE = MOVE

In addition to reporting the start and stop TSC position, these positions are also converted to the corresponding science instrument detector name, one of ACIS-I, ACIS-S, HRC-I, or HRC-S. The maximum PWM value 3MRMMXMV (sampled at the stop time + 66 seconds) is also included.

Fields

Field

Type

Description

start

Char(21)

Start time (YYYY:DDD:HH:MM:SS)

stop

Char(21)

Stop time (YYYY:DDD:HH:MM:SS)

tstart

Float

Start time (CXC secs)

tstop

Float

Stop time (CXC secs)

dur

Float

Duration (secs)

obsid

Integer

Observation ID (COBSRQID)

start_3tscpos

Integer

Start TSC position (steps)

stop_3tscpos

Integer

Stop TSC position (steps)

start_det

Char(6)

Start detector (ACIS-I ACIS-S HRC-I HRC-S)

stop_det

Char(6)

Stop detector (ACIS-I ACIS-S HRC-I HRC-S)

max_pwm

Integer

Max PWM during translation