205P/Giacobini
メタデータ
| 項目 |
値 |
| Designation |
205P/Giacobini |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-05-14T00:01:56.562240Z |
| Orbit solution date (soln_date, UTC) |
2023-07-20T15:02:32Z |
| Obs used |
564 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
9.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-02-19.0000000 |
| e |
0.56693106 |
| q (au) |
1.536180 |
| a (au) |
3.547195 |
| i (deg) |
15.287237 |
| Ω (om, deg) |
179.624626 |
| ω (w, deg) |
154.256561 |
| M (ma, deg) |
293.759426 |
等級
散乱 + 全体線形
$$
M_a = (14.018 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.018 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.635 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2021-05-14 |
2021-11-14 |
+11.4698 |
-2.714 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
11:33:50.66 |
-01:19:34.0 |
HIP 56263 |
38.94 |
| 2026-02-03 12:00 |
11:33:39.61 |
-01:18:09.1 |
HIP 56263 |
38.09 |
| 2026-02-04 00:00 |
11:33:28.40 |
-01:16:43.0 |
HIP 56263 |
37.47 |
| 2026-02-04 12:00 |
11:33:17.03 |
-01:15:15.6 |
HIP 56263 |
37.10 |
| 2026-02-05 00:00 |
11:33:05.51 |
-01:13:46.9 |
HIP 56263 |
37.00 |
| 2026-02-05 12:00 |
11:32:53.83 |
-01:12:17.0 |
HIP 56263 |
37.20 |
| 2026-02-06 00:00 |
11:32:41.99 |
-01:10:45.8 |
HIP 56263 |
37.68 |
| 2026-02-06 12:00 |
11:32:30.01 |
-01:09:13.5 |
HIP 56263 |
38.47 |
| 2026-02-07 00:00 |
11:32:17.87 |
-01:07:39.9 |
HIP 56263 |
39.54 |
| 2026-02-07 12:00 |
11:32:05.58 |
-01:06:05.0 |
HIP 56263 |
40.89 |
| 2026-02-08 00:00 |
11:31:53.13 |
-01:04:29.0 |
HIP 56061 |
39.60 |
| 2026-02-08 12:00 |
11:31:40.55 |
-01:02:51.8 |
HIP 56061 |
36.09 |
| 2026-02-09 00:00 |
11:31:27.81 |
-01:01:13.4 |
HIP 56061 |
32.55 |
| 2026-02-09 12:00 |
11:31:14.93 |
-00:59:33.7 |
HIP 56061 |
28.97 |
| 2026-02-10 00:00 |
11:31:01.91 |
-00:57:53.0 |
HIP 56061 |
25.37 |
| 2026-02-10 12:00 |
11:30:48.75 |
-00:56:11.0 |
HIP 56061 |
21.75 |
| 2026-02-11 00:00 |
11:30:35.44 |
-00:54:27.9 |
HIP 56061 |
18.13 |
| 2026-02-11 12:00 |
11:30:22.00 |
-00:52:43.6 |
HIP 56061 |
14.54 |
| 2026-02-12 00:00 |
11:30:08.42 |
-00:50:58.2 |
HIP 56061 |
11.03 |
| 2026-02-12 12:00 |
11:29:54.71 |
-00:49:11.7 |
HIP 56061 |
7.80 |
| 2026-02-13 00:00 |
11:29:40.86 |
-00:47:24.1 |
HIP 56061 |
5.45 |
| 2026-02-13 12:00 |
11:29:26.88 |
-00:45:35.3 |
HIP 56061 |
5.39 |
| 2026-02-14 00:00 |
11:29:12.77 |
-00:43:45.5 |
HIP 56061 |
7.73 |
| 2026-02-14 12:00 |
11:28:58.54 |
-00:41:54.6 |
HIP 56061 |
11.09 |
| 2026-02-15 00:00 |
11:28:44.18 |
-00:40:02.6 |
HIP 56061 |
14.80 |
| 2026-02-15 12:00 |
11:28:29.70 |
-00:38:09.5 |
HIP 55960 |
17.02 |
| 2026-02-16 00:00 |
11:28:15.10 |
-00:36:15.4 |
HIP 55960 |
17.85 |
| 2026-02-16 12:00 |
11:28:00.38 |
-00:34:20.3 |
HIP 55960 |
19.55 |
| 2026-02-17 00:00 |
11:27:45.54 |
-00:32:24.1 |
HIP 55960 |
21.93 |
| 2026-02-17 12:00 |
11:27:30.58 |
-00:30:26.9 |
HIP 55960 |
24.83 |
| 2026-02-18 00:00 |
11:27:15.52 |
-00:28:28.8 |
HIP 55960 |
28.08 |
| 2026-02-18 12:00 |
11:27:00.35 |
-00:26:29.7 |
HIP 55960 |
31.61 |
| 2026-02-19 00:00 |
11:26:45.06 |
-00:24:29.6 |
HIP 55960 |
35.32 |
| 2026-02-19 12:00 |
11:26:29.68 |
-00:22:28.5 |
HIP 55960 |
39.19 |
| 2026-02-20 00:00 |
11:26:14.19 |
-00:20:26.6 |
HIP 55960 |
43.18 |
| 2026-02-20 12:00 |
11:25:58.59 |
-00:18:23.7 |
HIP 55800 |
46.31 |
| 2026-02-21 00:00 |
11:25:42.91 |
-00:16:19.9 |
HIP 55595 |
43.60 |
| 2026-02-21 12:00 |
11:25:27.12 |
-00:14:15.2 |
HIP 55595 |
39.17 |
| 2026-02-22 00:00 |
11:25:11.25 |
-00:12:09.7 |
HIP 55595 |
34.72 |
| 2026-02-22 12:00 |
11:24:55.28 |
-00:10:03.3 |
HIP 55595 |
30.25 |
| 2026-02-23 00:00 |
11:24:39.22 |
-00:07:56.1 |
HIP 55595 |
25.77 |
| 2026-02-23 12:00 |
11:24:23.09 |
-00:05:48.0 |
HIP 55595 |
21.29 |
| 2026-02-24 00:00 |
11:24:06.86 |
-00:03:39.2 |
HIP 55595 |
16.84 |