366P/Spacewatch
メタデータ
| 項目 |
値 |
| Designation |
366P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-01-05T10:45:06.180480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:37Z |
| Obs used |
74 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
17.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-03-17T04:21:57.024000Z |
| Discovery magnitude (MPC) |
20.20 N |
| Discovery observatory (MPC) |
J04 · ESA Optical Ground Station, Tenerife |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-05-04.0000000 |
| e |
0.34736448 |
| q (au) |
2.284924 |
| a (au) |
3.501073 |
| i (deg) |
8.853746 |
| Ω (om, deg) |
70.797085 |
| ω (w, deg) |
153.581562 |
| M (ma, deg) |
268.005489 |
等級
散乱 + 全体線形
$$
M_a = (14.629 + 4.782\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.629 |
| n |
4.782 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:28:24.28 |
-21:31:51.3 |
HIP 106006 |
12.01 |
| 2026-02-03 12:00 |
21:29:10.05 |
-21:28:32.7 |
HIP 106006 |
20.14 |
| 2026-02-04 00:00 |
21:29:55.76 |
-21:25:13.8 |
HIP 106039 |
28.67 |
| 2026-02-04 12:00 |
21:30:41.41 |
-21:21:54.7 |
HIP 106350 |
33.25 |
| 2026-02-05 00:00 |
21:31:27.00 |
-21:18:35.3 |
HIP 106350 |
24.02 |
| 2026-02-05 12:00 |
21:32:12.53 |
-21:15:15.6 |
HIP 106431 |
17.04 |
| 2026-02-06 00:00 |
21:32:58.00 |
-21:11:55.8 |
HIP 106431 |
7.90 |
| 2026-02-06 12:00 |
21:33:43.42 |
-21:08:35.7 |
HIP 106431 |
9.01 |
| 2026-02-07 00:00 |
21:34:28.77 |
-21:05:15.3 |
HIP 106431 |
18.60 |
| 2026-02-07 12:00 |
21:35:14.06 |
-21:01:54.8 |
HIP 106729 |
26.84 |
| 2026-02-08 00:00 |
21:35:59.30 |
-20:58:34.0 |
HIP 106729 |
16.72 |
| 2026-02-08 12:00 |
21:36:44.47 |
-20:55:13.0 |
HIP 106729 |
9.17 |
| 2026-02-09 00:00 |
21:37:29.58 |
-20:51:51.9 |
HIP 106729 |
11.54 |
| 2026-02-09 12:00 |
21:38:14.63 |
-20:48:30.5 |
HIP 106729 |
20.65 |
| 2026-02-10 00:00 |
21:38:59.61 |
-20:45:08.9 |
HIP 106764 |
27.42 |
| 2026-02-10 12:00 |
21:39:44.54 |
-20:41:47.2 |
HIP 106764 |
33.99 |
| 2026-02-11 00:00 |
21:40:29.40 |
-20:38:25.3 |
HIP 106764 |
42.45 |
| 2026-02-11 12:00 |
21:41:14.20 |
-20:35:03.2 |
HIP 107111 |
47.26 |
| 2026-02-12 00:00 |
21:41:58.94 |
-20:31:41.0 |
HIP 107111 |
43.41 |
| 2026-02-12 12:00 |
21:42:43.61 |
-20:28:18.6 |
HIP 107111 |
42.16 |
| 2026-02-13 00:00 |
21:43:28.22 |
-20:24:56.1 |
HIP 107111 |
43.74 |
| 2026-02-13 12:00 |
21:44:12.77 |
-20:21:33.4 |
HIP 107238 |
46.44 |
| 2026-02-14 00:00 |
21:44:57.25 |
-20:18:10.6 |
HIP 107238 |
47.63 |
| 2026-02-14 12:00 |
21:45:41.66 |
-20:14:47.7 |
HIP 107599 |
48.85 |
| 2026-02-15 00:00 |
21:46:26.01 |
-20:11:24.6 |
HIP 107599 |
40.67 |
| 2026-02-15 12:00 |
21:47:10.30 |
-20:08:01.5 |
HIP 107599 |
34.09 |
| 2026-02-16 00:00 |
21:47:54.52 |
-20:04:38.2 |
HIP 107599 |
30.16 |
| 2026-02-16 12:00 |
21:48:38.67 |
-20:01:14.9 |
HIP 107599 |
29.93 |
| 2026-02-17 00:00 |
21:49:22.75 |
-19:57:51.4 |
HIP 107845 |
25.79 |
| 2026-02-17 12:00 |
21:50:06.77 |
-19:54:27.9 |
HIP 107845 |
20.50 |
| 2026-02-18 00:00 |
21:50:50.72 |
-19:51:04.3 |
HIP 107845 |
20.30 |
| 2026-02-18 12:00 |
21:51:34.60 |
-19:47:40.7 |
HIP 107989 |
22.51 |
| 2026-02-19 00:00 |
21:52:18.41 |
-19:44:16.9 |
HIP 107989 |
13.94 |
| 2026-02-19 12:00 |
21:53:02.15 |
-19:40:53.2 |
HIP 107989 |
10.84 |
| 2026-02-20 00:00 |
21:53:45.82 |
-19:37:29.4 |
HIP 107989 |
16.60 |
| 2026-02-20 12:00 |
21:54:29.43 |
-19:34:05.5 |
HIP 108203 |
12.32 |
| 2026-02-21 00:00 |
21:55:12.96 |
-19:30:41.7 |
HIP 108203 |
7.76 |
| 2026-02-21 12:00 |
21:55:56.42 |
-19:27:17.8 |
HIP 108203 |
14.20 |
| 2026-02-22 00:00 |
21:56:39.81 |
-19:23:53.9 |
HIP 108352 |
13.80 |
| 2026-02-22 12:00 |
21:57:23.13 |
-19:20:30.0 |
HIP 108352 |
10.11 |
| 2026-02-23 00:00 |
21:58:06.38 |
-19:17:06.1 |
HIP 108352 |
15.68 |
| 2026-02-23 12:00 |
21:58:49.55 |
-19:13:42.2 |
HIP 108502 |
22.88 |
| 2026-02-24 00:00 |
21:59:32.65 |
-19:10:18.3 |
HIP 108708 |
25.52 |