We present the deep homogeneous 𝑈𝐵𝑉𝑅𝐼 photometric data of 135,071 stars down to 𝑉 ∼ 23 mag and 𝐼 ∼ 22 mag toward the Carina Nebula. These stars are cross-matched with those from the previous surveys in the X-ray, near-infrared, and mid-infrared wavelengths as well as the Gaia Early Data Release 3 (EDR3). This master catalog allows us to select reliable members and determine the fundamental parameters distance, size, stellar density of stellar clusters in this star-forming region. We revisit the reddening toward the nebula using the optical and the near-infrared colors of early-type stars. The foreground reddening [𝐸(𝐵 −𝑉) 𝑓 𝑔] is determined to be 0.35 ± 0.02, and it seems to follow the standard reddening law. On the other hand, the total-toselective extinction ratio of the intracluster medium (𝑅𝑉,𝑐𝑙) decreases from the central region (Trumpler 14 and 16, 𝑅𝑉,𝑐𝑙 ∼ 4.5) to the northern region (Trumpler 15, 𝑅𝑉,𝑐𝑙 ∼ 3.4). It implies that the central region is more dusty than the northern region. We find that the distance modulus of the Carina Nebula to be 11.9 ± 0.3 mag (𝑑 = 2.4 ± 0.35 kpc) using a zero-age main-sequence fitting method, which is in good agreement with that derived from the Gaia EDR3 parallaxes. We also present the catalog of 3,331 pre-main-sequence (PMS) members and 14,974 PMS candidates down to 𝑉 ∼ 22 mag based on spectrophotometric properties of young stars at infrared, optical, and X-ray wavelengths. From the spatial distribution of PMS members and PMS candidates, we confirm that the member selection is very reliable down to faint stars. Our data will have a legacy value for follow-up studies with different scientific purposes.

Abstract
1. Introduction
2. Observations
    2.1. SSO 1m Observation
    2.2. CTIO 4m Observation
    2.3. The Combined Optical Data
    2.4. Completeness Test
3. Cross-Identification of Stars in the PreviousSurveys
    3.1. The Chandra Carina Complex Project (CCCP)
    3.2. 𝐽𝐻𝐾𝑆 Near-Infrared Data
    3.3. The Spitzer Vela-Carina Survey
    3.4. Gaia Early Data Release 3
    3.5. The Gaia-ESO Spectroscopic Survey
4. Reddening
    4.1. Early-Type Stars and Their Reddening
    4.2. Spatial Variation of 𝑅𝑉,𝑐𝑙
5. Distance
6. Photometric Diagrams
    6.1. PMS Member Distribution in Color-Magnitude Diagrams
    6.2. Two-Color Diagrams
    6.3. PMS Membership Selection
7. Spatial Distribution of the PMS Membersand Candidates
8. Summary and Conclusion
Acknowledgments
References

• Hyeonoh Hur(The Young Astronauts Korea)
• Beomdu Lim(Department of Earth Science Education, Kongju National University, Earth Environment Research Center, Kongju National University, Korea Astronomy and Space Science Institute) Corresponding Author
• Moo-Young Chun(Korea Astronomy and Space Science Institute)