C/2025 T1 (ATLAS)
메타데이터
| 항목 | 값 |
|---|---|
| Designation | C/2025 T1 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-12-02T09:03:18.529920Z |
| Orbit solution date (soln_date, UTC) | 2026-05-22T14:12:20Z |
| Obs used | 821 |
| NEO | - |
| M1 | 12.100 |
| K1 | 19.000 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2025-10-11T14:54:27.014400Z |
| Discovery magnitude (MPC) | 17.50 o |
| Discovery observatory (MPC) | T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-11-29.0000000 |
| e | 0.99965815 |
| q (au) | 1.108807 |
| a (au) | 3243.581968 |
| i (deg) | 123.433643 |
| Ω (om, deg) | 140.494892 |
| ω (w, deg) | 114.142738 |
| M (ma, deg) | 359.999982 |
밝기
산란 + 전체 선형
$$ M_a = (11.672 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 11.672 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.900 |
| k | 0.860 |
| 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 |
|---|---|---|---|
| 2025-10-11 | 2025-12-02 | +38.7971 | -3.630 |
| 2025-12-02 | 2026-05-17 | +7.6302 | -2.206 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 17:41:07.58 | -65:23:50.8 | HIP 86544 | 4.19 |
| 2026-09-20 12:00 | 17:40:58.34 | -65:20:11.2 | HIP 86544 | 1.39 |
| 2026-09-21 00:00 | 17:40:49.81 | -65:16:33.1 | HIP 86544 | 3.80 |
| 2026-09-21 12:00 | 17:40:41.97 | -65:12:56.6 | HIP 86544 | 7.36 |
| 2026-09-22 00:00 | 17:40:34.81 | -65:09:21.5 | HIP 86536 | 5.65 |
| 2026-09-22 12:00 | 17:40:28.32 | -65:05:48.0 | HIP 86536 | 4.03 |
| 2026-09-23 00:00 | 17:40:22.50 | -65:02:16.0 | HIP 86536 | 5.12 |
| 2026-09-23 12:00 | 17:40:17.32 | -64:58:45.6 | HIP 86536 | 7.80 |
| 2026-09-24 00:00 | 17:40:12.78 | -64:55:16.8 | HIP 86536 | 10.93 |
| 2026-09-24 12:00 | 17:40:08.87 | -64:51:49.5 | HIP 86536 | 14.19 |
| 2026-09-25 00:00 | 17:40:05.58 | -64:48:23.8 | HIP 86536 | 17.49 |
| 2026-09-25 12:00 | 17:40:02.90 | -64:44:59.7 | HIP 86536 | 20.79 |
| 2026-09-26 00:00 | 17:40:00.81 | -64:41:37.2 | HIP 86188 | 23.45 |
| 2026-09-26 12:00 | 17:39:59.32 | -64:38:16.3 | HIP 86188 | 22.13 |
| 2026-09-27 00:00 | 17:39:58.40 | -64:34:57.0 | HIP 86188 | 21.33 |
| 2026-09-27 12:00 | 17:39:58.05 | -64:31:39.4 | HIP 86358 | 18.87 |
| 2026-09-28 00:00 | 17:39:58.27 | -64:28:23.3 | HIP 86358 | 15.95 |
| 2026-09-28 12:00 | 17:39:59.04 | -64:25:08.9 | HIP 86358 | 13.26 |
| 2026-09-29 00:00 | 17:40:00.35 | -64:21:56.1 | HIP 86358 | 10.93 |
| 2026-09-29 12:00 | 17:40:02.20 | -64:18:44.9 | HIP 86358 | 9.22 |
| 2026-09-30 00:00 | 17:40:04.57 | -64:15:35.3 | HIP 86358 | 8.49 |
| 2026-09-30 12:00 | 17:40:07.47 | -64:12:27.4 | HIP 86358 | 8.95 |
| 2026-10-01 00:00 | 17:40:10.88 | -64:09:21.1 | HIP 86358 | 10.42 |
| 2026-10-01 12:00 | 17:40:14.79 | -64:06:16.4 | HIP 86358 | 12.54 |
| 2026-10-02 00:00 | 17:40:19.21 | -64:03:13.4 | HIP 86358 | 15.03 |
| 2026-10-02 12:00 | 17:40:24.11 | -64:00:12.0 | HIP 86600 | 17.26 |
| 2026-10-03 00:00 | 17:40:29.49 | -63:57:12.3 | HIP 86600 | 14.48 |
| 2026-10-03 12:00 | 17:40:35.35 | -63:54:14.2 | HIP 86600 | 11.82 |
| 2026-10-04 00:00 | 17:40:41.68 | -63:51:17.7 | HIP 86600 | 9.35 |
| 2026-10-04 12:00 | 17:40:48.47 | -63:48:22.8 | HIP 86600 | 7.28 |
| 2026-10-05 00:00 | 17:40:55.72 | -63:45:29.6 | HIP 86600 | 6.01 |
| 2026-10-05 12:00 | 17:41:03.42 | -63:42:38.1 | HIP 86600 | 6.03 |
| 2026-10-06 00:00 | 17:41:11.56 | -63:39:48.2 | HIP 86600 | 7.32 |
| 2026-10-06 12:00 | 17:41:20.13 | -63:36:59.9 | HIP 86600 | 9.37 |
| 2026-10-07 00:00 | 17:41:29.14 | -63:34:13.2 | HIP 86600 | 11.77 |
| 2026-10-07 12:00 | 17:41:38.57 | -63:31:28.2 | HIP 86600 | 14.35 |
| 2026-10-08 00:00 | 17:41:48.41 | -63:28:44.8 | HIP 86600 | 17.01 |
| 2026-10-08 12:00 | 17:41:58.67 | -63:26:03.1 | HIP 86600 | 19.73 |
| 2026-10-09 00:00 | 17:42:09.33 | -63:23:23.0 | HIP 86600 | 22.48 |
| 2026-10-09 12:00 | 17:42:20.39 | -63:20:44.5 | HIP 86600 | 25.25 |
| 2026-10-10 00:00 | 17:42:31.84 | -63:18:07.6 | HIP 86600 | 28.02 |
| 2026-10-10 12:00 | 17:42:43.68 | -63:15:32.4 | HIP 86600 | 30.81 |
| 2026-10-11 00:00 | 17:42:55.90 | -63:12:58.8 | HIP 86600 | 33.59 |