메타데이터
| 항목 |
값 |
| Designation |
449P/Leonard |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-11-23T14:34:44.742720Z |
| Orbit solution date (soln_date, UTC) |
2024-02-25T22:13:10Z |
| Obs used |
294 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
37.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
1987-03-23T09:59:28.320000Z |
| Discovery magnitude (MPC) |
17.50 T |
| Discovery observatory (MPC) |
260 · Siding Spring Observatory-DSS |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-10-20.0000000 |
| e |
0.47899106 |
| q (au) |
1.874781 |
| a (au) |
3.598367 |
| i (deg) |
15.459226 |
| Ω (om, deg) |
242.570978 |
| ω (w, deg) |
176.651702 |
| M (ma, deg) |
355.002928 |
밝기
산란 + 전체 선형
$$
M_a = (14.886 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.886 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-0.800 |
| k |
0.993 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
19:24:51.45 |
-04:46:59.3 |
HIP 95453 |
6.58 |
| 2026-09-20 12:00 |
19:24:52.13 |
-04:48:41.2 |
HIP 95453 |
4.97 |
| 2026-09-21 00:00 |
19:24:53.13 |
-04:50:22.7 |
HIP 95453 |
3.41 |
| 2026-09-21 12:00 |
19:24:54.45 |
-04:52:03.8 |
HIP 95453 |
2.03 |
| 2026-09-22 00:00 |
19:24:56.10 |
-04:53:44.5 |
HIP 95453 |
1.50 |
| 2026-09-22 12:00 |
19:24:58.06 |
-04:55:24.7 |
HIP 95453 |
2.49 |
| 2026-09-23 00:00 |
19:25:00.35 |
-04:57:04.5 |
HIP 95453 |
4.01 |
| 2026-09-23 12:00 |
19:25:02.95 |
-04:58:43.9 |
HIP 95453 |
5.67 |
| 2026-09-24 00:00 |
19:25:05.88 |
-05:00:22.8 |
HIP 95453 |
7.39 |
| 2026-09-24 12:00 |
19:25:09.12 |
-05:02:01.1 |
HIP 95453 |
9.14 |
| 2026-09-25 00:00 |
19:25:12.68 |
-05:03:39.0 |
HIP 95453 |
10.94 |
| 2026-09-25 12:00 |
19:25:16.56 |
-05:05:16.4 |
HIP 95453 |
12.76 |
| 2026-09-26 00:00 |
19:25:20.75 |
-05:06:53.2 |
HIP 95453 |
14.62 |
| 2026-09-26 12:00 |
19:25:25.26 |
-05:08:29.5 |
HIP 95453 |
16.51 |
| 2026-09-27 00:00 |
19:25:30.09 |
-05:10:05.3 |
HIP 95453 |
18.44 |
| 2026-09-27 12:00 |
19:25:35.22 |
-05:11:40.4 |
HIP 95433 |
18.42 |
| 2026-09-28 00:00 |
19:25:40.68 |
-05:13:15.0 |
HIP 95433 |
18.32 |
| 2026-09-28 12:00 |
19:25:46.44 |
-05:14:49.0 |
HIP 95433 |
18.52 |
| 2026-09-29 00:00 |
19:25:52.52 |
-05:16:22.4 |
HIP 95433 |
19.04 |
| 2026-09-29 12:00 |
19:25:58.91 |
-05:17:55.2 |
HIP 95433 |
19.86 |
| 2026-09-30 00:00 |
19:26:05.61 |
-05:19:27.4 |
HIP 95433 |
20.96 |
| 2026-09-30 12:00 |
19:26:12.62 |
-05:20:58.9 |
HIP 95433 |
22.32 |
| 2026-10-01 00:00 |
19:26:19.94 |
-05:22:29.8 |
HIP 95433 |
23.90 |
| 2026-10-01 12:00 |
19:26:27.57 |
-05:24:00.0 |
HIP 95433 |
25.68 |
| 2026-10-02 00:00 |
19:26:35.51 |
-05:25:29.5 |
HIP 95433 |
27.64 |
| 2026-10-02 12:00 |
19:26:43.76 |
-05:26:58.3 |
HIP 95433 |
29.74 |
| 2026-10-03 00:00 |
19:26:52.31 |
-05:28:26.5 |
HIP 95433 |
31.99 |
| 2026-10-03 12:00 |
19:27:01.17 |
-05:29:53.9 |
HIP 95433 |
34.36 |
| 2026-10-04 00:00 |
19:27:10.33 |
-05:31:20.6 |
HIP 95433 |
36.83 |
| 2026-10-04 12:00 |
19:27:19.80 |
-05:32:46.5 |
HIP 95433 |
39.41 |
| 2026-10-05 00:00 |
19:27:29.58 |
-05:34:11.7 |
HIP 95433 |
42.08 |
| 2026-10-05 12:00 |
19:27:39.66 |
-05:35:36.2 |
HIP 95433 |
44.84 |
| 2026-10-06 00:00 |
19:27:50.04 |
-05:36:59.8 |
HIP 95433 |
47.69 |
| 2026-10-06 12:00 |
19:28:00.72 |
-05:38:22.7 |
HIP 95698 |
49.36 |
| 2026-10-07 00:00 |
19:28:11.71 |
-05:39:44.8 |
HIP 95698 |
50.91 |
| 2026-10-07 12:00 |
19:28:22.99 |
-05:41:06.0 |
HIP 95698 |
52.60 |
| 2026-10-08 00:00 |
19:28:34.58 |
-05:42:26.4 |
HIP 95698 |
54.41 |
| 2026-10-08 12:00 |
19:28:46.46 |
-05:43:46.0 |
HIP 95910 |
53.42 |
| 2026-10-09 00:00 |
19:28:58.64 |
-05:45:04.8 |
HIP 95910 |
50.98 |
| 2026-10-09 12:00 |
19:29:11.12 |
-05:46:22.6 |
HIP 95910 |
48.63 |
| 2026-10-10 00:00 |
19:29:23.90 |
-05:47:39.6 |
HIP 95910 |
46.39 |
| 2026-10-10 12:00 |
19:29:36.96 |
-05:48:55.7 |
HIP 95910 |
44.31 |
| 2026-10-11 00:00 |
19:29:50.32 |
-05:50:10.9 |
HIP 95910 |
42.41 |