メタデータ
| 項目 |
値 |
| Designation |
61P/Shajn-Schaldach |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-10-23T19:34:06.749760Z |
| Orbit solution date (soln_date, UTC) |
2024-05-14T12:48:19Z |
| Obs used |
895 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
13.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-09-30.0000000 |
| e |
0.42420483 |
| q (au) |
2.125862 |
| a (au) |
3.692046 |
| i (deg) |
6.000525 |
| Ω (om, deg) |
162.968506 |
| ω (w, deg) |
221.656974 |
| M (ma, deg) |
356.691277 |
等級
散乱 + 全体線形
$$
M_a = (13.270 + 3.029\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.270 |
| n |
3.029 |
| gf |
0.905 |
| gb |
-0.772 |
| k |
0.996 |
| δ90 |
5.458 |
| 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 |
| 2022-05-06 |
2022-10-23 |
-6.7763 |
+2.138 |
| 2022-10-23 |
2024-02-09 |
+10.6603 |
-3.646 |
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) |
| 2026-03-26 00:00 |
13:41:20.71 |
-05:35:44.0 |
HIP 66706 |
25.14 |
| 2026-03-26 12:00 |
13:41:05.66 |
-05:33:53.2 |
HIP 66706 |
21.65 |
| 2026-03-27 00:00 |
13:40:50.51 |
-05:32:02.0 |
HIP 66706 |
18.42 |
| 2026-03-27 12:00 |
13:40:35.26 |
-05:30:10.5 |
HIP 66706 |
15.66 |
| 2026-03-28 00:00 |
13:40:19.91 |
-05:28:18.7 |
HIP 66706 |
13.66 |
| 2026-03-28 12:00 |
13:40:04.48 |
-05:26:26.6 |
HIP 66706 |
12.81 |
| 2026-03-29 00:00 |
13:39:48.96 |
-05:24:34.2 |
HIP 66706 |
13.37 |
| 2026-03-29 12:00 |
13:39:33.35 |
-05:22:41.6 |
HIP 66706 |
15.18 |
| 2026-03-30 00:00 |
13:39:17.65 |
-05:20:48.7 |
HIP 66706 |
17.89 |
| 2026-03-30 12:00 |
13:39:01.88 |
-05:18:55.5 |
HIP 66706 |
21.17 |
| 2026-03-31 00:00 |
13:38:46.02 |
-05:17:02.2 |
HIP 66706 |
24.81 |
| 2026-03-31 12:00 |
13:38:30.09 |
-05:15:08.6 |
HIP 66706 |
28.67 |
| 2026-04-01 00:00 |
13:38:14.08 |
-05:13:14.8 |
HIP 66450 |
28.13 |
| 2026-04-01 12:00 |
13:37:58.00 |
-05:11:20.9 |
HIP 66450 |
24.76 |
| 2026-04-02 00:00 |
13:37:41.86 |
-05:09:26.8 |
HIP 66450 |
21.76 |
| 2026-04-02 12:00 |
13:37:25.64 |
-05:07:32.6 |
HIP 66450 |
19.32 |
| 2026-04-03 00:00 |
13:37:09.36 |
-05:05:38.2 |
HIP 66450 |
17.69 |
| 2026-04-03 12:00 |
13:36:53.02 |
-05:03:43.7 |
HIP 66450 |
17.12 |
| 2026-04-04 00:00 |
13:36:36.62 |
-05:01:49.2 |
HIP 66450 |
17.72 |
| 2026-04-04 12:00 |
13:36:20.16 |
-04:59:54.5 |
HIP 66311 |
14.39 |
| 2026-04-05 00:00 |
13:36:03.65 |
-04:57:59.8 |
HIP 66311 |
9.94 |
| 2026-04-05 12:00 |
13:35:47.09 |
-04:56:05.1 |
HIP 66311 |
5.62 |
| 2026-04-06 00:00 |
13:35:30.48 |
-04:54:10.3 |
HIP 66311 |
2.40 |
| 2026-04-06 12:00 |
13:35:13.82 |
-04:52:15.6 |
HIP 66311 |
4.64 |
| 2026-04-07 00:00 |
13:34:57.11 |
-04:50:20.8 |
HIP 66311 |
8.90 |
| 2026-04-07 12:00 |
13:34:40.37 |
-04:48:26.0 |
HIP 66311 |
13.38 |
| 2026-04-08 00:00 |
13:34:23.59 |
-04:46:31.3 |
HIP 66311 |
17.92 |
| 2026-04-08 12:00 |
13:34:06.77 |
-04:44:36.7 |
HIP 66311 |
22.49 |
| 2026-04-09 00:00 |
13:33:49.92 |
-04:42:42.1 |
HIP 66226 |
22.38 |
| 2026-04-09 12:00 |
13:33:33.04 |
-04:40:47.6 |
HIP 66226 |
22.68 |
| 2026-04-10 00:00 |
13:33:16.13 |
-04:38:53.3 |
HIP 66226 |
23.90 |
| 2026-04-10 12:00 |
13:32:59.20 |
-04:36:59.0 |
HIP 66226 |
25.90 |
| 2026-04-11 00:00 |
13:32:42.24 |
-04:35:04.9 |
HIP 66226 |
28.53 |
| 2026-04-11 12:00 |
13:32:25.27 |
-04:33:11.0 |
HIP 66226 |
31.63 |
| 2026-04-12 00:00 |
13:32:08.28 |
-04:31:17.3 |
HIP 65940 |
29.37 |
| 2026-04-12 12:00 |
13:31:51.27 |
-04:29:23.7 |
HIP 65940 |
25.66 |
| 2026-04-13 00:00 |
13:31:34.25 |
-04:27:30.4 |
HIP 65940 |
22.30 |
| 2026-04-13 12:00 |
13:31:17.23 |
-04:25:37.3 |
HIP 65940 |
19.48 |
| 2026-04-14 00:00 |
13:31:00.20 |
-04:23:44.4 |
HIP 65940 |
17.47 |
| 2026-04-14 12:00 |
13:30:43.17 |
-04:21:51.9 |
HIP 65940 |
16.55 |
| 2026-04-15 00:00 |
13:30:26.14 |
-04:19:59.6 |
HIP 65940 |
16.91 |
| 2026-04-15 12:00 |
13:30:09.11 |
-04:18:07.6 |
HIP 65940 |
18.47 |
| 2026-04-16 00:00 |
13:29:52.09 |
-04:16:16.0 |
HIP 65751 |
20.95 |