メタデータ
| 項目 |
値 |
| Designation |
146P/Shoemaker-LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-08-05T08:53:48.851520Z |
| Orbit solution date (soln_date, UTC) |
2025-05-09T00:50:37Z |
| Obs used |
660 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
21.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-04-07.0000000 |
| e |
0.64733427 |
| q (au) |
1.421549 |
| a (au) |
4.030867 |
| i (deg) |
23.109042 |
| Ω (om, deg) |
53.379790 |
| ω (w, deg) |
316.990390 |
| M (ma, deg) |
256.312817 |
等級
散乱 + 全体線形
$$
M_a = (12.467 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.467 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2024-05-06 |
2024-08-05 |
+10.3090 |
-2.699 |
| 2024-08-06 |
2024-10-12 |
+42.9787 |
-7.408 |
| 2024-10-12 |
2025-05-01 |
-11.2690 |
+3.718 |
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) |
| 2026-09-20 00:00 |
11:42:02.86 |
+22:03:56.9 |
HIP 57082 |
8.74 |
| 2026-09-20 12:00 |
11:42:25.46 |
+22:01:40.7 |
HIP 57082 |
11.95 |
| 2026-09-21 00:00 |
11:42:48.05 |
+21:59:25.2 |
HIP 57082 |
16.55 |
| 2026-09-21 12:00 |
11:43:10.61 |
+21:57:10.4 |
HIP 57082 |
21.67 |
| 2026-09-22 00:00 |
11:43:33.15 |
+21:54:56.2 |
HIP 57082 |
27.01 |
| 2026-09-22 12:00 |
11:43:55.67 |
+21:52:42.7 |
HIP 57318 |
26.18 |
| 2026-09-23 00:00 |
11:44:18.18 |
+21:50:29.9 |
HIP 57318 |
21.27 |
| 2026-09-23 12:00 |
11:44:40.65 |
+21:48:17.7 |
HIP 57318 |
16.84 |
| 2026-09-24 00:00 |
11:45:03.11 |
+21:46:06.2 |
HIP 57318 |
13.40 |
| 2026-09-24 12:00 |
11:45:25.54 |
+21:43:55.3 |
HIP 57318 |
11.82 |
| 2026-09-25 00:00 |
11:45:47.95 |
+21:41:45.2 |
HIP 57318 |
12.81 |
| 2026-09-25 12:00 |
11:46:10.34 |
+21:39:35.7 |
HIP 57318 |
15.87 |
| 2026-09-26 00:00 |
11:46:32.70 |
+21:37:26.9 |
HIP 57318 |
20.08 |
| 2026-09-26 12:00 |
11:46:55.04 |
+21:35:18.8 |
HIP 57318 |
24.85 |
| 2026-09-27 00:00 |
11:47:17.35 |
+21:33:11.4 |
HIP 57318 |
29.92 |
| 2026-09-27 12:00 |
11:47:39.63 |
+21:31:04.7 |
HIP 57318 |
35.14 |
| 2026-09-28 00:00 |
11:48:01.89 |
+21:28:58.7 |
HIP 57729 |
31.89 |
| 2026-09-28 12:00 |
11:48:24.12 |
+21:26:53.4 |
HIP 57729 |
26.65 |
| 2026-09-29 00:00 |
11:48:46.32 |
+21:24:48.7 |
HIP 57729 |
21.58 |
| 2026-09-29 12:00 |
11:49:08.50 |
+21:22:44.9 |
HIP 57729 |
16.82 |
| 2026-09-30 00:00 |
11:49:30.65 |
+21:20:41.7 |
HIP 57729 |
12.73 |
| 2026-09-30 12:00 |
11:49:52.77 |
+21:18:39.2 |
HIP 57711 |
9.90 |
| 2026-10-01 00:00 |
11:50:14.86 |
+21:16:37.5 |
HIP 57711 |
7.41 |
| 2026-10-01 12:00 |
11:50:36.91 |
+21:14:36.5 |
HIP 57711 |
8.55 |
| 2026-10-02 00:00 |
11:50:58.94 |
+21:12:36.3 |
HIP 57711 |
12.34 |
| 2026-10-02 12:00 |
11:51:20.94 |
+21:10:36.7 |
HIP 57711 |
17.09 |
| 2026-10-03 00:00 |
11:51:42.91 |
+21:08:38.0 |
HIP 57951 |
21.49 |
| 2026-10-03 12:00 |
11:52:04.84 |
+21:06:39.9 |
HIP 57951 |
16.01 |
| 2026-10-04 00:00 |
11:52:26.74 |
+21:04:42.7 |
HIP 57951 |
10.55 |
| 2026-10-04 12:00 |
11:52:48.61 |
+21:02:46.2 |
HIP 57951 |
5.10 |
| 2026-10-05 00:00 |
11:53:10.44 |
+21:00:50.4 |
HIP 57951 |
0.56 |
| 2026-10-05 12:00 |
11:53:32.24 |
+20:58:55.5 |
HIP 57951 |
5.82 |
| 2026-10-06 00:00 |
11:53:54.00 |
+20:57:01.3 |
HIP 57951 |
11.24 |
| 2026-10-06 12:00 |
11:54:15.72 |
+20:55:07.9 |
HIP 57951 |
16.65 |
| 2026-10-07 00:00 |
11:54:37.41 |
+20:53:15.3 |
HIP 57951 |
22.05 |
| 2026-10-07 12:00 |
11:54:59.06 |
+20:51:23.4 |
HIP 58016 |
26.12 |
| 2026-10-08 00:00 |
11:55:20.67 |
+20:49:32.4 |
HIP 58016 |
27.79 |
| 2026-10-08 12:00 |
11:55:42.25 |
+20:47:42.2 |
HIP 58016 |
30.34 |
| 2026-10-09 00:00 |
11:56:03.78 |
+20:45:52.8 |
HIP 58161 |
33.41 |
| 2026-10-09 12:00 |
11:56:25.27 |
+20:44:04.2 |
HIP 58161 |
36.28 |
| 2026-10-10 00:00 |
11:56:46.73 |
+20:42:16.5 |
HIP 58471 |
38.74 |
| 2026-10-10 12:00 |
11:57:08.13 |
+20:40:29.5 |
HIP 58471 |
34.50 |
| 2026-10-11 00:00 |
11:57:29.50 |
+20:38:43.4 |
HIP 58471 |
30.59 |