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 |
5.457 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
13:09:18.19 |
-02:18:07.6 |
HIP 64120 |
25.63 |
| 2026-06-03 00:00 |
13:09:11.96 |
-02:17:44.1 |
HIP 64120 |
25.29 |
| 2026-06-03 12:00 |
13:09:05.91 |
-02:17:21.7 |
HIP 64120 |
25.05 |
| 2026-06-04 00:00 |
13:09:00.04 |
-02:17:00.5 |
HIP 64120 |
24.90 |
| 2026-06-04 12:00 |
13:08:54.34 |
-02:16:40.5 |
HIP 64120 |
24.83 |
| 2026-06-05 00:00 |
13:08:48.81 |
-02:16:21.7 |
HIP 64120 |
24.83 |
| 2026-06-05 12:00 |
13:08:43.47 |
-02:16:04.1 |
HIP 64120 |
24.90 |
| 2026-06-06 00:00 |
13:08:38.29 |
-02:15:47.7 |
HIP 64120 |
25.03 |
| 2026-06-06 12:00 |
13:08:33.30 |
-02:15:32.5 |
HIP 64120 |
25.22 |
| 2026-06-07 00:00 |
13:08:28.48 |
-02:15:18.5 |
HIP 64120 |
25.44 |
| 2026-06-07 12:00 |
13:08:23.84 |
-02:15:05.6 |
HIP 64120 |
25.69 |
| 2026-06-08 00:00 |
13:08:19.37 |
-02:14:54.0 |
HIP 64120 |
25.98 |
| 2026-06-08 12:00 |
13:08:15.08 |
-02:14:43.5 |
HIP 64120 |
26.28 |
| 2026-06-09 00:00 |
13:08:10.97 |
-02:14:34.2 |
HIP 64120 |
26.60 |
| 2026-06-09 12:00 |
13:08:07.04 |
-02:14:26.1 |
HIP 64120 |
26.92 |
| 2026-06-10 00:00 |
13:08:03.28 |
-02:14:19.2 |
HIP 64000 |
26.54 |
| 2026-06-10 12:00 |
13:07:59.71 |
-02:14:13.5 |
HIP 64000 |
25.89 |
| 2026-06-11 00:00 |
13:07:56.31 |
-02:14:09.0 |
HIP 64000 |
25.29 |
| 2026-06-11 12:00 |
13:07:53.09 |
-02:14:05.6 |
HIP 64000 |
24.76 |
| 2026-06-12 00:00 |
13:07:50.05 |
-02:14:03.4 |
HIP 64000 |
24.28 |
| 2026-06-12 12:00 |
13:07:47.18 |
-02:14:02.4 |
HIP 64000 |
23.86 |
| 2026-06-13 00:00 |
13:07:44.50 |
-02:14:02.6 |
HIP 64000 |
23.49 |
| 2026-06-13 12:00 |
13:07:42.00 |
-02:14:03.9 |
HIP 64000 |
23.18 |
| 2026-06-14 00:00 |
13:07:39.67 |
-02:14:06.4 |
HIP 64000 |
22.92 |
| 2026-06-14 12:00 |
13:07:37.52 |
-02:14:10.1 |
HIP 64000 |
22.71 |
| 2026-06-15 00:00 |
13:07:35.56 |
-02:14:14.9 |
HIP 64000 |
22.55 |
| 2026-06-15 12:00 |
13:07:33.77 |
-02:14:20.9 |
HIP 64000 |
22.43 |
| 2026-06-16 00:00 |
13:07:32.16 |
-02:14:28.1 |
HIP 64000 |
22.36 |
| 2026-06-16 12:00 |
13:07:30.73 |
-02:14:36.4 |
HIP 64000 |
22.34 |
| 2026-06-17 00:00 |
13:07:29.48 |
-02:14:45.9 |
HIP 64000 |
22.35 |
| 2026-06-17 12:00 |
13:07:28.41 |
-02:14:56.5 |
HIP 64000 |
22.41 |
| 2026-06-18 00:00 |
13:07:27.51 |
-02:15:08.3 |
HIP 64000 |
22.51 |
| 2026-06-18 12:00 |
13:07:26.80 |
-02:15:21.2 |
HIP 64000 |
22.64 |
| 2026-06-19 00:00 |
13:07:26.26 |
-02:15:35.3 |
HIP 64000 |
22.81 |
| 2026-06-19 12:00 |
13:07:25.90 |
-02:15:50.5 |
HIP 64000 |
23.01 |
| 2026-06-20 00:00 |
13:07:25.71 |
-02:16:06.8 |
HIP 64000 |
23.25 |
| 2026-06-20 12:00 |
13:07:25.71 |
-02:16:24.2 |
HIP 64000 |
23.53 |
| 2026-06-21 00:00 |
13:07:25.88 |
-02:16:42.7 |
HIP 64000 |
23.83 |
| 2026-06-21 12:00 |
13:07:26.22 |
-02:17:02.4 |
HIP 64000 |
24.17 |
| 2026-06-22 00:00 |
13:07:26.74 |
-02:17:23.1 |
HIP 64000 |
24.54 |