C/2025 A6 (Lemmon)
메타데이터
| 항목 | 값 |
|---|---|
| Designation | C/2025 A6 (Lemmon) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-11-08T12:56:48.091200Z |
| Orbit solution date (soln_date, UTC) | 2026-07-16T19:12:19Z |
| Obs used | 2093 |
| NEO | - |
| M1 | 10.400 |
| K1 | 9.000 |
| PC | - |
| Discovery observation (MPC, UTC) | 2025-01-03T08:12:42.537600Z |
| Discovery magnitude (MPC) | 21.65 G |
| Discovery observatory (MPC) | G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-10-30.0000000 |
| e | 0.99553724 |
| q (au) | 0.529903 |
| a (au) | 118.739024 |
| i (deg) | 143.663706 |
| Ω (om, deg) | 108.097982 |
| ω (w, deg) | 132.969076 |
| M (ma, deg) | 359.992733 |
밝기
산란 + 전체 선형
$$ M_a = (8.636 + 5.223\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 8.636 |
| n | 5.223 |
| gf | 1.000 |
| gb | -0.517 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 2024-11-12 | 2025-09-20 | +5.9267 | -0.968 |
| 2025-09-20 | 2025-11-08 | -3.5645 | -0.098 |
| 2025-11-08 | 2026-01-23 | -6.8790 | -1.865 |
| 2026-01-23 | 2026-03-23 | +13.0950 | -6.206 |
| 2026-03-23 | 2026-07-14 | -1.9588 | +0.239 |
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 | 11:09:22.57 | -30:39:14.5 | HIP 54610 | 19.51 |
| 2026-07-29 12:00 | 11:09:41.03 | -30:38:02.7 | HIP 54610 | 15.70 |
| 2026-07-30 00:00 | 11:09:59.54 | -30:36:53.3 | HIP 54610 | 12.15 |
| 2026-07-30 12:00 | 11:10:18.09 | -30:35:46.2 | HIP 54610 | 9.15 |
| 2026-07-31 00:00 | 11:10:36.69 | -30:34:41.4 | HIP 54610 | 7.40 |
| 2026-07-31 12:00 | 11:10:55.32 | -30:33:38.9 | HIP 54610 | 7.80 |
| 2026-08-01 00:00 | 11:11:14.00 | -30:32:38.7 | HIP 54610 | 10.09 |
| 2026-08-01 12:00 | 11:11:32.72 | -30:31:40.8 | HIP 54610 | 13.33 |
| 2026-08-02 00:00 | 11:11:51.48 | -30:30:45.1 | HIP 54610 | 16.99 |
| 2026-08-02 12:00 | 11:12:10.27 | -30:29:51.7 | HIP 54610 | 20.84 |
| 2026-08-03 00:00 | 11:12:29.11 | -30:29:00.4 | HIP 54610 | 24.80 |
| 2026-08-03 12:00 | 11:12:47.98 | -30:28:11.4 | HIP 54890 | 27.19 |
| 2026-08-04 00:00 | 11:13:06.89 | -30:27:24.5 | HIP 54890 | 23.77 |
| 2026-08-04 12:00 | 11:13:25.83 | -30:26:39.8 | HIP 54890 | 20.64 |
| 2026-08-05 00:00 | 11:13:44.80 | -30:25:57.2 | HIP 54890 | 17.96 |
| 2026-08-05 12:00 | 11:14:03.81 | -30:25:16.8 | HIP 54890 | 15.97 |
| 2026-08-06 00:00 | 11:14:22.85 | -30:24:38.5 | HIP 54890 | 14.93 |
| 2026-08-06 12:00 | 11:14:41.92 | -30:24:02.3 | HIP 54890 | 15.05 |
| 2026-08-07 00:00 | 11:15:01.02 | -30:23:28.2 | HIP 54890 | 16.30 |
| 2026-08-07 12:00 | 11:15:20.16 | -30:22:56.1 | HIP 55052 | 15.87 |
| 2026-08-08 00:00 | 11:15:39.32 | -30:22:26.1 | HIP 55052 | 13.17 |
| 2026-08-08 12:00 | 11:15:58.50 | -30:21:58.2 | HIP 55052 | 11.42 |
| 2026-08-09 00:00 | 11:16:17.72 | -30:21:32.3 | HIP 55052 | 11.08 |
| 2026-08-09 12:00 | 11:16:36.96 | -30:21:08.4 | HIP 55052 | 12.28 |
| 2026-08-10 00:00 | 11:16:56.22 | -30:20:46.5 | HIP 55052 | 14.64 |
| 2026-08-10 12:00 | 11:17:15.51 | -30:20:26.6 | HIP 55052 | 17.71 |
| 2026-08-11 00:00 | 11:17:34.82 | -30:20:08.7 | HIP 55052 | 21.19 |
| 2026-08-11 12:00 | 11:17:54.16 | -30:19:52.7 | HIP 55292 | 19.81 |
| 2026-08-12 00:00 | 11:18:13.51 | -30:19:38.7 | HIP 55292 | 15.63 |
| 2026-08-12 12:00 | 11:18:32.89 | -30:19:26.6 | HIP 55292 | 11.45 |
| 2026-08-13 00:00 | 11:18:52.28 | -30:19:16.5 | HIP 55292 | 7.26 |
| 2026-08-13 12:00 | 11:19:11.69 | -30:19:08.2 | HIP 55292 | 3.08 |
| 2026-08-14 00:00 | 11:19:31.12 | -30:19:01.8 | HIP 55292 | 1.17 |
| 2026-08-14 12:00 | 11:19:50.56 | -30:18:57.3 | HIP 55292 | 5.33 |
| 2026-08-15 00:00 | 11:20:10.02 | -30:18:54.6 | HIP 55338 | 8.38 |
| 2026-08-15 12:00 | 11:20:29.49 | -30:18:53.8 | HIP 55338 | 10.60 |
| 2026-08-16 00:00 | 11:20:48.98 | -30:18:54.7 | HIP 55338 | 13.76 |
| 2026-08-16 12:00 | 11:21:08.47 | -30:18:57.6 | HIP 55338 | 17.36 |
| 2026-08-17 00:00 | 11:21:27.98 | -30:19:02.2 | HIP 55444 | 20.29 |
| 2026-08-17 12:00 | 11:21:47.50 | -30:19:08.5 | HIP 55444 | 21.30 |
| 2026-08-18 00:00 | 11:22:07.02 | -30:19:16.7 | HIP 55615 | 22.21 |
| 2026-08-18 12:00 | 11:22:26.55 | -30:19:26.6 | HIP 55615 | 18.48 |
| 2026-08-19 00:00 | 11:22:46.10 | -30:19:38.2 | HIP 55615 | 14.97 |