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) |
| 2026-05-12 00:00 |
13:16:22.02 |
-02:53:31.8 |
HIP 64721 |
14.57 |
| 2026-05-12 12:00 |
13:16:08.99 |
-02:52:18.7 |
HIP 64721 |
14.73 |
| 2026-05-13 00:00 |
13:15:56.09 |
-02:51:06.7 |
HIP 64721 |
15.65 |
| 2026-05-13 12:00 |
13:15:43.32 |
-02:49:55.7 |
HIP 64721 |
17.20 |
| 2026-05-14 00:00 |
13:15:30.69 |
-02:48:45.8 |
HIP 64721 |
19.20 |
| 2026-05-14 12:00 |
13:15:18.20 |
-02:47:37.0 |
HIP 64569 |
18.44 |
| 2026-05-15 00:00 |
13:15:05.84 |
-02:46:29.2 |
HIP 64569 |
15.46 |
| 2026-05-15 12:00 |
13:14:53.63 |
-02:45:22.5 |
HIP 64569 |
12.66 |
| 2026-05-16 00:00 |
13:14:41.56 |
-02:44:16.9 |
HIP 64569 |
10.16 |
| 2026-05-16 12:00 |
13:14:29.63 |
-02:43:12.4 |
HIP 64569 |
8.17 |
| 2026-05-17 00:00 |
13:14:17.85 |
-02:42:09.1 |
HIP 64569 |
7.11 |
| 2026-05-17 12:00 |
13:14:06.21 |
-02:41:06.8 |
HIP 64569 |
7.32 |
| 2026-05-18 00:00 |
13:13:54.73 |
-02:40:05.7 |
HIP 64569 |
8.67 |
| 2026-05-18 12:00 |
13:13:43.39 |
-02:39:05.7 |
HIP 64498 |
9.36 |
| 2026-05-19 00:00 |
13:13:32.21 |
-02:38:06.8 |
HIP 64498 |
6.63 |
| 2026-05-19 12:00 |
13:13:21.17 |
-02:37:09.0 |
HIP 64498 |
4.23 |
| 2026-05-20 00:00 |
13:13:10.30 |
-02:36:12.4 |
HIP 64498 |
3.00 |
| 2026-05-20 12:00 |
13:12:59.57 |
-02:35:17.0 |
HIP 64498 |
4.05 |
| 2026-05-21 00:00 |
13:12:49.01 |
-02:34:22.7 |
HIP 64498 |
6.28 |
| 2026-05-21 12:00 |
13:12:38.60 |
-02:33:29.6 |
HIP 64498 |
8.80 |
| 2026-05-22 00:00 |
13:12:28.35 |
-02:32:37.6 |
HIP 64498 |
11.38 |
| 2026-05-22 12:00 |
13:12:18.26 |
-02:31:46.8 |
HIP 64498 |
13.96 |
| 2026-05-23 00:00 |
13:12:08.33 |
-02:30:57.1 |
HIP 64498 |
16.53 |
| 2026-05-23 12:00 |
13:11:58.56 |
-02:30:08.7 |
HIP 64457 |
18.19 |
| 2026-05-24 00:00 |
13:11:48.95 |
-02:29:21.4 |
HIP 64457 |
19.21 |
| 2026-05-24 12:00 |
13:11:39.51 |
-02:28:35.3 |
HIP 64318 |
18.39 |
| 2026-05-25 00:00 |
13:11:30.23 |
-02:27:50.3 |
HIP 64318 |
17.85 |
| 2026-05-25 12:00 |
13:11:21.11 |
-02:27:06.5 |
HIP 64318 |
17.62 |
| 2026-05-26 00:00 |
13:11:12.16 |
-02:26:23.9 |
HIP 64318 |
17.71 |
| 2026-05-26 12:00 |
13:11:03.38 |
-02:25:42.5 |
HIP 64318 |
18.08 |
| 2026-05-27 00:00 |
13:10:54.76 |
-02:25:02.3 |
HIP 64318 |
18.72 |
| 2026-05-27 12:00 |
13:10:46.31 |
-02:24:23.3 |
HIP 64318 |
19.56 |
| 2026-05-28 00:00 |
13:10:38.03 |
-02:23:45.4 |
HIP 64318 |
20.58 |
| 2026-05-28 12:00 |
13:10:29.92 |
-02:23:08.8 |
HIP 64318 |
21.74 |
| 2026-05-29 00:00 |
13:10:21.97 |
-02:22:33.3 |
HIP 64318 |
23.00 |
| 2026-05-29 12:00 |
13:10:14.20 |
-02:21:59.0 |
HIP 64318 |
24.33 |
| 2026-05-30 00:00 |
13:10:06.60 |
-02:21:25.9 |
HIP 64318 |
25.71 |
| 2026-05-30 12:00 |
13:09:59.16 |
-02:20:54.0 |
HIP 64318 |
27.13 |
| 2026-05-31 00:00 |
13:09:51.90 |
-02:20:23.3 |
HIP 64318 |
28.57 |
| 2026-05-31 12:00 |
13:09:44.81 |
-02:19:53.8 |
HIP 64120 |
28.01 |
| 2026-06-01 00:00 |
13:09:37.90 |
-02:19:25.5 |
HIP 64120 |
27.25 |
| 2026-06-01 12:00 |
13:09:31.15 |
-02:18:58.3 |
HIP 64120 |
26.60 |
| 2026-06-02 00:00 |
13:09:24.58 |
-02:18:32.4 |
HIP 64120 |
26.06 |