S4 0954+65 multiwavelength SED

Names and position

Also known as 1FGL J1000.1+6539, 1FLAT J095847.0+653353, 1Jy 0954+658, 1OUNYU J095847+6533.8, 2FGL J0958.6+6533, 2FHL J0958.3+6535, 3EG0958+6533, 3FGL J0958.6+6534, 5BZB J0958+6533, BZB J0958+6533, CRATES J095847+653405, QSO B0954+658, S40954+658, TXS 0954+658.

• Class: BL Lac
• Redshift: z = 0.367
• Position (ICRS): RA 149.69685°, Dec 65.56523°
• Galactic: l 145.746°, b 43.132°

Other names and measurements: NED and SIMBAD within 5″ of this position.

The SED

• Data: 8,402 points (2 upper limits) from 43 catalogues
• Dated data: 2006–2025 (MJD 53920–60968)
• Undated catalogue values: 779
• Frequency range of detections: log ν = 7.9–26.2 [Hz] (radio, microwave, infrared, optical, ultraviolet, X-ray, γ-ray)
• Swift measurements analysed by MMDC: 1,098 UVOT and 730 XRT
• Largest catalogues (points): ZTF (2,009), ASAS-SN (1,805), MMDCXRT_ORBIT (800), NEOWISE (744), MMDCGR (702)

Data by band

All 7 bands have data. The infrared band has the most points, 2,972 of 8,402; its largest catalogue is ZTF with 2,009.

Get the data

• The SED as CSV from the MMDC SED API (docs.mmdc.am).
• In Python, with astro-mmdc:

  from astro_mmdc import MMDC
  sed = MMDC().sed.get(ra=149.69685, dec=65.56523, name="S4 0954+65")

• The interactive SED plot, with time filtering and modeling (needs JavaScript).

Nearby sources

• OK 630, 5.2° away
• S4 1030+61, 6.1° away
• TXS 1028+605, 6.4° away
• 4C +71.07, 8.9° away

Other BL Lac objects

• Mrk 180
• TXS 1055+567
• MS 0737.9+7441
• TXS 1148+592
• SBS 1200+608
• S5 0716+71

How to cite

Sahakyan, N., Vardanyan, V., Giommi, P., et al. 2024, AJ, 168, 289, doi:10.3847/1538-3881/ad8231 (arXiv:2410.01207).