C/2025 R2 (SWAN)
메타데이터
| 항목 | 값 |
|---|---|
| Designation | C/2025 R2 (SWAN) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-09-12T20:18:11.635200Z |
| Orbit solution date (soln_date, UTC) | 2026-04-14T13:42:19Z |
| Obs used | 2411 |
| NEO | - |
| M1 | 13.900 |
| K1 | 9.750 |
| PC | - |
| Discovery observation (MPC, UTC) | 2025-09-11T23:33:15.552000Z |
| Discovery magnitude (MPC) | 7.50 V |
| Discovery observatory (MPC) | 247 · Roving Observer |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-11-12.0000000 |
| e | 0.99419610 |
| q (au) | 0.504084 |
| a (au) | 86.852676 |
| i (deg) | 4.472975 |
| Ω (om, deg) | 335.325998 |
| ω (w, deg) | 308.358648 |
| M (ma, deg) | 0.073248 |
밝기
산란 + 전체 선형
$$ M_a = (12.781 + 5.054\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 12.781 |
| n | 5.054 |
| gf | 0.998 |
| gb | -1.000 |
| k | 0.936 |
| δ90 | 9.994 |
| 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 |
|---|---|---|---|
| 2025-09-12 | 2026-03-09 | -1.8514 | -0.982 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
찾아보기
천체력
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 04:05:54.33 | +24:29:37.3 | HIP 19137 | 14.50 |
| 2026-06-01 12:00 | 04:06:24.98 | +24:31:04.2 | HIP 19137 | 13.66 |
| 2026-06-02 00:00 | 04:06:55.56 | +24:32:30.7 | HIP 19137 | 16.25 |
| 2026-06-02 12:00 | 04:07:26.07 | +24:33:56.7 | HIP 19137 | 21.01 |
| 2026-06-03 00:00 | 04:07:56.50 | +24:35:22.3 | HIP 19137 | 26.80 |
| 2026-06-03 12:00 | 04:08:26.86 | +24:36:47.5 | HIP 19137 | 33.08 |
| 2026-06-04 00:00 | 04:08:57.14 | +24:38:12.2 | HIP 19464 | 34.91 |
| 2026-06-04 12:00 | 04:09:27.36 | +24:39:36.6 | HIP 19468 | 33.49 |
| 2026-06-05 00:00 | 04:09:57.50 | +24:41:00.5 | HIP 19604 | 29.07 |
| 2026-06-05 12:00 | 04:10:27.56 | +24:42:23.9 | HIP 19604 | 22.96 |
| 2026-06-06 00:00 | 04:10:57.55 | +24:43:47.0 | HIP 19604 | 17.51 |
| 2026-06-06 12:00 | 04:11:27.46 | +24:45:09.6 | HIP 19604 | 13.53 |
| 2026-06-07 00:00 | 04:11:57.30 | +24:46:31.8 | HIP 19604 | 12.48 |
| 2026-06-07 12:00 | 04:12:27.06 | +24:47:53.6 | HIP 19604 | 14.95 |
| 2026-06-08 00:00 | 04:12:56.74 | +24:49:14.9 | HIP 19604 | 19.64 |
| 2026-06-08 12:00 | 04:13:26.35 | +24:50:35.9 | HIP 19604 | 25.33 |
| 2026-06-09 00:00 | 04:13:55.88 | +24:51:56.4 | HIP 19604 | 31.47 |
| 2026-06-09 12:00 | 04:14:25.33 | +24:53:16.5 | HIP 19829 | 35.89 |
| 2026-06-10 00:00 | 04:14:54.70 | +24:54:36.2 | HIP 19829 | 36.09 |
| 2026-06-10 12:00 | 04:15:23.99 | +24:55:55.5 | HIP 19902 | 36.67 |
| 2026-06-11 00:00 | 04:15:53.20 | +24:57:14.4 | HIP 20065 | 31.17 |
| 2026-06-11 12:00 | 04:16:22.32 | +24:58:32.9 | HIP 20065 | 24.76 |
| 2026-06-12 00:00 | 04:16:51.37 | +24:59:50.9 | HIP 20065 | 18.61 |
| 2026-06-12 12:00 | 04:17:20.34 | +25:01:08.6 | HIP 20065 | 13.03 |
| 2026-06-13 00:00 | 04:17:49.22 | +25:02:25.8 | HIP 20091 | 9.02 |
| 2026-06-13 12:00 | 04:18:18.02 | +25:03:42.7 | HIP 20091 | 4.13 |
| 2026-06-14 00:00 | 04:18:46.73 | +25:04:59.1 | HIP 20091 | 6.39 |
| 2026-06-14 12:00 | 04:19:15.36 | +25:06:15.1 | HIP 20091 | 12.33 |
| 2026-06-15 00:00 | 04:19:43.90 | +25:07:30.7 | HIP 20091 | 18.70 |
| 2026-06-15 12:00 | 04:20:12.35 | +25:08:46.0 | HIP 20091 | 25.16 |
| 2026-06-16 00:00 | 04:20:40.72 | +25:10:00.8 | HIP 20091 | 31.64 |
| 2026-06-16 12:00 | 04:21:09.00 | +25:11:15.2 | HIP 20430 | 32.85 |
| 2026-06-17 00:00 | 04:21:37.19 | +25:12:29.2 | HIP 20430 | 28.44 |
| 2026-06-17 12:00 | 04:22:05.29 | +25:13:42.8 | HIP 20430 | 24.96 |
| 2026-06-18 00:00 | 04:22:33.30 | +25:14:56.1 | HIP 20430 | 22.83 |
| 2026-06-18 12:00 | 04:23:01.22 | +25:16:08.9 | HIP 20430 | 22.41 |
| 2026-06-19 00:00 | 04:23:29.05 | +25:17:21.3 | HIP 20604 | 19.05 |
| 2026-06-19 12:00 | 04:23:56.79 | +25:18:33.4 | HIP 20604 | 12.86 |
| 2026-06-20 00:00 | 04:24:24.43 | +25:19:45.0 | HIP 20604 | 7.03 |
| 2026-06-20 12:00 | 04:24:51.98 | +25:20:56.3 | HIP 20604 | 3.79 |
| 2026-06-21 00:00 | 04:25:19.44 | +25:22:07.2 | HIP 20604 | 7.70 |
| 2026-06-21 12:00 | 04:25:46.80 | +25:23:17.7 | HIP 20604 | 13.54 |
| 2026-06-22 00:00 | 04:26:14.06 | +25:24:27.8 | HIP 20604 | 19.64 |