Proposal #704

Proposer	(55006) Andre Rozmanic (andrerozmanic@gmail.com) obscode: ARHA
Assigned To	(3663) Dirk Terrell
Date Submitted	June 25, 2026
Status	Allocated
Priority	Normal
Proposal	I am monitoring the RR Lyrae star XZ Cygni for a research project on standard candles and cosmic distance mapping. The goal is to verify its 0.466-day period and calculate its distance using the distance modulus formula. This project also provides a time-series dataset to practice ensemble photometry on the AAVSO VPhot platform. Strategy: I request a Johnson V filter for a duration of 11 nights. To save network queue time, I request a snapshot cadence of 4 to 5 exposures per night. Data will be phase-folded during analysis to map the complete cycle and calculate the mean apparent magnitude.

Targets

Target Name	RA (H.HH)	Dec (D.DD)	Magnitude	Observation Frequency	Expiration Date	Proprietary Term
XZ Cyg	19.538560	56.38131	10.4–8.7	1	Dec. 19, 2026	1 Year

Plans currently in place

bsm_nh2/AAVSO_P704_ARHA_AUTO.csv

# $Id: AAVSO_P704_ARHA_AUTO.csv 5892 2026-07-02 19:55:57Z MZK $
#PROPOSAL=704
#REQUESTER=ARHA,,vphot
#target,hh,mm,ss.ss,dd,mm,ss.s,desc,priority,monitor,maxX,nrepeat,bin,[filter,exposure,nexp]
XZ_Cyg,19,32,29.31,56,23,17.5,XZ_Cyg,75,1,2,1,1,V,15,3,HourAngle=-3 -2,BestEfforts=1,EarliestTime=2026-06-18T00:00:00,LatestTime=2026-12-19T00:00:00
XZ_Cyg__1,19,32,29.31,56,23,17.5,XZ_Cyg,75,1,2,1,1,V,15,3,HourAngle=-2 -1,BestEfforts=1,EarliestTime=2026-06-18T00:00:00,LatestTime=2026-12-19T00:00:00
XZ_Cyg__2,19,32,29.31,56,23,17.5,XZ_Cyg,75,1,2,1,1,V,15,3,HourAngle=-1 0,BestEfforts=1,EarliestTime=2026-06-18T00:00:00,LatestTime=2026-12-19T00:00:00
XZ_Cyg__3,19,32,29.31,56,23,17.5,XZ_Cyg,75,1,2,1,1,V,15,3,HourAngle=0 +1,BestEfforts=1,EarliestTime=2026-06-18T00:00:00,LatestTime=2026-12-19T00:00:00
XZ_Cyg__4,19,32,29.31,56,23,17.5,XZ_Cyg,75,1,2,1,1,V,15,3,HourAngle=+1 +2,BestEfforts=1,EarliestTime=2026-06-18T00:00:00,LatestTime=2026-12-19T00:00:00
XZ_Cyg__5,19,32,29.31,56,23,17.5,XZ_Cyg,75,1,2,1,1,V,15,3,HourAngle=+2 +3,BestEfforts=1,EarliestTime=2026-06-18T00:00:00,LatestTime=2026-12-19T00:00:00

Comments

(3663) Dirk Terrell — June 30, 2026, 5:02 p.m.: The TAC is ok with this project as an educational project but questions whether 4-5 data points per night is sufficient. We will leave that up to you can Ken Menzies who schedules the telescopes. Time series on multiple telescopes over a short period might be more useful but that is obviously more of a strain on shared resources.
(4726) Kenneth Menzies — July 2, 2026, 8 p.m.: committed to BSM_NH2
(4726) Kenneth Menzies — July 2, 2026, 8 p.m.: committed to BSM_NH2

Comments on this proposal are closed.