C/2023 C2 (ATLAS)
메타데이터
| 항목 | 값 |
|---|---|
| Designation | C/2023 C2 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-11-16T18:48:06.632640Z |
| Orbit solution date (soln_date, UTC) | 2026-07-17T08:02:31Z |
| Obs used | 1945 |
| NEO | - |
| M1 | 10.900 |
| K1 | 4.500 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2023-02-01T06:05:54.758400Z |
| Discovery magnitude (MPC) | 19.12 o |
| Discovery observatory (MPC) | W68 · ATLAS Chile, Rio Hurtado |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-03-17.0000000 |
| e | 0.99900712 |
| q (au) | 2.368478 |
| a (au) | 2385.465256 |
| i (deg) | 48.322002 |
| Ω (om, deg) | 301.004610 |
| ω (w, deg) | 357.445237 |
| M (ma, deg) | 0.001017 |
밝기
산란 + 전체 선형
$$ M_a = (9.954 + 2.732\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 9.954 |
| n | 2.732 |
| gf | 1.000 |
| gb | -0.708 |
| k | 0.967 |
| δ90 | 10.000 |
| 파라미터 | 기호 | 범위 | 설명 |
|---|---|---|---|
| 태양·지구거리 1 AU에서의 절대등급 | H0 | -5 to 20 | 혜성의 고유 밝기 |
| 광도 기울기 파라미터 | n | 2 to 6 | 태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 | gf |
0.8 to 1 | 전방 산란의 강도 |
| 후방 산란 비대칭 계수 | gb |
-1 to -0.5 | 후방 산란의 강도 |
| 분할 계수 | k | 0.8 to 1 | 전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 | δ90 | 1 to 10 | 코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) | 끝 (UTC) | a | b |
|---|---|---|---|
| 2023-02-01 | 2024-02-08 | +0.7847 | -0.169 |
| 2024-02-08 | 2024-04-08 | +3.4591 | -1.616 |
| 2024-04-08 | 2024-11-13 | +2.8577 | -1.492 |
| 2024-11-28 | 2025-11-18 | -0.9102 | +0.497 |
| 2025-11-18 | 2026-07-17 | -0.5964 | +0.030 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
찾아보기
천체력
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 02:46:00.38 | +63:17:53.4 | HIP 13125 | 19.14 |
| 2026-07-29 12:00 | 02:46:15.95 | +63:21:12.0 | HIP 13125 | 17.85 |
| 2026-07-30 00:00 | 02:46:31.27 | +63:24:30.4 | HIP 13125 | 17.33 |
| 2026-07-30 12:00 | 02:46:46.36 | +63:27:48.5 | HIP 13125 | 17.63 |
| 2026-07-31 00:00 | 02:47:01.19 | +63:31:06.3 | HIP 13125 | 18.69 |
| 2026-07-31 12:00 | 02:47:15.78 | +63:34:23.9 | HIP 13125 | 20.39 |
| 2026-08-01 00:00 | 02:47:30.12 | +63:37:41.2 | HIP 13125 | 22.57 |
| 2026-08-01 12:00 | 02:47:44.20 | +63:40:58.3 | HIP 13125 | 25.11 |
| 2026-08-02 00:00 | 02:47:58.03 | +63:44:15.1 | HIP 13125 | 27.89 |
| 2026-08-02 12:00 | 02:48:11.60 | +63:47:31.5 | HIP 13059 | 29.73 |
| 2026-08-03 00:00 | 02:48:24.91 | +63:50:47.7 | HIP 13059 | 26.64 |
| 2026-08-03 12:00 | 02:48:37.97 | +63:54:03.6 | HIP 13059 | 23.70 |
| 2026-08-04 00:00 | 02:48:50.76 | +63:57:19.2 | HIP 13059 | 20.93 |
| 2026-08-04 12:00 | 02:49:03.28 | +64:00:34.4 | HIP 13059 | 18.44 |
| 2026-08-05 00:00 | 02:49:15.54 | +64:03:49.3 | HIP 13059 | 16.30 |
| 2026-08-05 12:00 | 02:49:27.53 | +64:07:03.9 | HIP 13059 | 14.69 |
| 2026-08-06 00:00 | 02:49:39.25 | +64:10:18.2 | HIP 13059 | 13.77 |
| 2026-08-06 12:00 | 02:49:50.69 | +64:13:32.1 | HIP 13059 | 13.67 |
| 2026-08-07 00:00 | 02:50:01.86 | +64:16:45.6 | HIP 13059 | 14.38 |
| 2026-08-07 12:00 | 02:50:12.75 | +64:19:58.8 | HIP 13059 | 15.80 |
| 2026-08-08 00:00 | 02:50:23.36 | +64:23:11.6 | HIP 13208 | 14.91 |
| 2026-08-08 12:00 | 02:50:33.69 | +64:26:24.0 | HIP 13208 | 12.07 |
| 2026-08-09 00:00 | 02:50:43.73 | +64:29:36.0 | HIP 13208 | 9.59 |
| 2026-08-09 12:00 | 02:50:53.49 | +64:32:47.6 | HIP 13208 | 7.80 |
| 2026-08-10 00:00 | 02:51:02.95 | +64:35:58.7 | HIP 13208 | 7.19 |
| 2026-08-10 12:00 | 02:51:12.13 | +64:39:09.5 | HIP 13208 | 8.03 |
| 2026-08-11 00:00 | 02:51:21.01 | +64:42:19.8 | HIP 13208 | 9.93 |
| 2026-08-11 12:00 | 02:51:29.60 | +64:45:29.7 | HIP 13437 | 10.87 |
| 2026-08-12 00:00 | 02:51:37.89 | +64:48:39.1 | HIP 13437 | 12.05 |
| 2026-08-12 12:00 | 02:51:45.88 | +64:51:48.0 | HIP 13437 | 13.94 |
| 2026-08-13 00:00 | 02:51:53.57 | +64:54:56.4 | HIP 13437 | 16.28 |
| 2026-08-13 12:00 | 02:52:00.96 | +64:58:04.4 | HIP 13437 | 18.89 |
| 2026-08-14 00:00 | 02:52:08.04 | +65:01:11.8 | HIP 13437 | 21.67 |
| 2026-08-14 12:00 | 02:52:14.82 | +65:04:18.7 | HIP 13437 | 24.55 |
| 2026-08-15 00:00 | 02:52:21.29 | +65:07:25.1 | HIP 13437 | 27.50 |
| 2026-08-15 12:00 | 02:52:27.44 | +65:10:30.9 | HIP 13376 | 27.68 |
| 2026-08-16 00:00 | 02:52:33.29 | +65:13:36.2 | HIP 13376 | 24.67 |
| 2026-08-16 12:00 | 02:52:38.82 | +65:16:41.0 | HIP 13376 | 21.69 |
| 2026-08-17 00:00 | 02:52:44.04 | +65:19:45.1 | HIP 13376 | 18.77 |
| 2026-08-17 12:00 | 02:52:48.94 | +65:22:48.7 | HIP 13376 | 15.92 |
| 2026-08-18 00:00 | 02:52:53.52 | +65:25:51.6 | HIP 13376 | 13.18 |
| 2026-08-18 12:00 | 02:52:57.78 | +65:28:54.0 | HIP 13376 | 10.62 |
| 2026-08-19 00:00 | 02:53:01.72 | +65:31:55.7 | HIP 13376 | 8.41 |