National Aeronautics and Space Administration

IPs

V455 And
V515 And
AE Aqr
FO Aqr
V349 Aqr
XY Ari
V405 Aur
V647 Aur
HT Cam
MU Cam
DW Cnc
BG CMi
V709 Cas
V1025 Cen
V1033 Cas
TV Col
TX Col
UU Col
V2069 Cyg
V2306 Cyg
DO Dra
PQ Gem
V418 Gem
DQ Her
V1323 Her
V1460 Her
V1674 Her
EX Hya
NY Lup
V2400 Oph
V2731 Oph
V3037 Oph
V598 Peg
GK Per
AO Psc
HZ Pup
V667 Pup
WX Pyx
V1223 Sgr
V4743 Sgr
CC Scl
V1062 Tau
EI UMa
AX J1740.1
AX J1832.3
AX J1853.3
CTCV J2056
CXO J174954
IGR J04571
IGR J08390
IGR J15094
IGR J16500
IGR J16547
IGR J17014
IGR J17195
IGR J18151
IGR J18173
IGR J18308
IGR J19267
LAMOST 0240
PBC J0927.8
PBC J1841.1
RX J1804
RX J2015
RX J2113
RX J2133
RX J2306
Swift J0717
Swift J1839
Swift J2006
Swift J2138

Full Catalog

Related Systems

Position

• Equatorial: 18^h57^m30.98^s, +16^d53^m39.5^s (Gaia)
• Galactic: l=48.71, b=+6.31

Finding Chart:

Brigntness:

Optical; G=19.9 (Gaia, quiescence): X-rays:

IP Credential:

**** (Confirmed): The spin period is seen in X-rays (during eruption), archival ZTF photometry, and post-eruption photometry. The last also 501.51 reveals the orbital period and orbital sidebands.

Periods:

• Orbital:0.15302(2) d = 3.6725 hr = 13321 s seen in optical photometry
• Spin: 0.005804 d = 8.3586(3) min = 501.51 s seen in X-rays and optical
• Others: \omega-\Omega and \omega-2\Omega sidebands seen in the optical

Inclination:

Distance:

? (Negative parallax in Gaia EDR3)

References

1. Mroz et al. 2021, ATel 14720 (archival optical photometry)
2. Quimby et al. 2021 (optical photometry)
3. Shugarov & Afonina 2021, ATel 14835 (optical photometry)
4. Patterson et al. 2021, ATel 14856 (optical photometry)
5. Shugarov & Afonina 2021 (optical photometry)
6. Hansen et al. 2021 (IR photometry)
7. Woodward et al. 2021 (IR spectroscopy)
8. Drake et al. 2021 (X-rays)