Katie's Observing Log

• Observing Checklists
  • Messier
  • NGC 1-999
  • NGC 1000-1999
  • NGC 2000-2999
  • NGC 3000-3999
  • NGC 4000-4999
  • NGC 5000-5999
  • NGC 6000-6999
  • NGC 7000-7840
  • IC 1-999
  • IC 1000-1999
  • IC 2000-2999
  • IC 3000-3999
  • IC 4000-4999
  • IC 5000-5386
  • Planets
• Observations by Date
  • 2022
  • 2023
  • 2024
• Constellations
• Observations by type
  • Star

    • Massive Star

      • beta Cep Variable
      • Evolved Supergiant

        • Red Supergiant
        • Yellow Supergiant
        • Blue Supergiant

          • Wolf-Rayet
      • Neutron Star

        • Pulsar
    • Young Stellar Object

      • Orion Variable
      • T Tauri Star
      • Herbig Ae/Be Star
      • Outflow

        • Herbig-Haro Object
    • Main Sequence Star

      • Be Star
      • Blue Straggler

        • SX Phe Variable
      • gamma Dor Variable
      • delta Sct Variable
    • Evolved Star

      • Red Giant Branch star
      • Hot Subdwarf
      • Horizontal Branch Star

        • RR Lyrae Variable
      • Type II Cepheid Variable
      • Cepheid Variable

        • Classical Cepheid Variable
      • Long-Period Variable
      • Asymptotic Giant Branch Star

        • Mira Variable
      • OH/IR Star
      • Post-AGB Star
      • RV Tauri Variable
      • Planetary Nebula
      • White Dwarf
    • Chemically Peculiar Star

      • alpha2 CVn Variable
    • SuperNova
    • Low-mass Star
    • Extra-solar Planet
    • Variable Star

      • Irregular Variable
      • Eruptive Variable
      • Rotating Variable
      • Pulsating Variable
    • Emission-line Star
    • High Proper Motion Star
  • Cluster of Stars

    • Globular Cluster
    • Open Cluster
  • Association of Stars

    • Stellar Stream
  • Interstellar Medium Object

    • Star Forming Region
    • HII Region
    • Cloud

      • Nebula

        • Reflection Nebula
      • Molecular Cloud
      • Dark Cloud (nebula)
      • High-velocity Cloud
    • Dense Core
    • SuperNova Remnant
  • Galaxy

    • Low Surface Brightness Galaxy
    • Starburst Galaxy
    • HII Galaxy
    • Emission-line galaxy
    • Active Galaxy Nucleus

      • Seyfert Galaxy

        • Seyfert 1 Galaxy
        • Seyfert 2 Galaxy
      • Radio Galaxy
      • LINER-type Active Galaxy Nucleus
      • Quasar

        • Blazar

          • BL Lac
  • Interacting Galaxies
  • Pair of Galaxies
  • Group of Galaxies

    • Compact Group of Galaxies
  • Cluster of Galaxies
  • Supercluster of Galaxies
  • Gravitational Source

    • Gravitational Lens System (lens+images)

      • Gravitational Lens
      • Gravitationally Lensed Image

        • Gravitationally Lensed Image of a Quasar
  • Transient Event
  • Variable source
  • Radio Source

    • Centimetric Radio Source
    • Millimetric Radio Source
    • Sub-Millimetric Source
    • HI (21cm) Source
    • Radio Burst
    • Maser
  • Infra-Red Source

    • Far-IR source (λ >= 30 µm)
    • Mid-IR Source (3 to 30 µm)
    • Near-IR Source (λ < 3 µm)
  • Optical Source

    • Emission Object
    • Blue Object
  • UV-emission Source
  • X-ray Source

    • Ultra-luminous X-ray Source
  • Gamma-ray Source

    • Gamma-ray Burst
• All Objects

Variable source

3C 273 First observed 2023-04-09 Last observed 2023-04-09