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) |
| 2026-03-26 00:00 |
10:38:57.59 |
+38:02:45.0 |
HIP 52139 |
8.39 |
| 2026-03-26 12:00 |
10:38:38.20 |
+38:02:05.4 |
HIP 52139 |
9.49 |
| 2026-03-27 00:00 |
10:38:19.01 |
+38:01:23.6 |
HIP 52139 |
11.77 |
| 2026-03-27 12:00 |
10:38:00.03 |
+38:00:39.6 |
HIP 52139 |
14.67 |
| 2026-03-28 00:00 |
10:37:41.25 |
+37:59:53.4 |
HIP 52139 |
17.86 |
| 2026-03-28 12:00 |
10:37:22.68 |
+37:59:05.0 |
HIP 52139 |
21.20 |
| 2026-03-29 00:00 |
10:37:04.33 |
+37:58:14.4 |
HIP 52139 |
24.61 |
| 2026-03-29 12:00 |
10:36:46.19 |
+37:57:21.7 |
HIP 52139 |
28.06 |
| 2026-03-30 00:00 |
10:36:28.27 |
+37:56:26.8 |
HIP 51705 |
30.67 |
| 2026-03-30 12:00 |
10:36:10.56 |
+37:55:29.9 |
HIP 51705 |
27.19 |
| 2026-03-31 00:00 |
10:35:53.07 |
+37:54:30.8 |
HIP 51705 |
23.81 |
| 2026-03-31 12:00 |
10:35:35.80 |
+37:53:29.7 |
HIP 51705 |
20.53 |
| 2026-04-01 00:00 |
10:35:18.76 |
+37:52:26.5 |
HIP 51705 |
17.42 |
| 2026-04-01 12:00 |
10:35:01.94 |
+37:51:21.2 |
HIP 51705 |
14.55 |
| 2026-04-02 00:00 |
10:34:45.34 |
+37:50:14.0 |
HIP 51705 |
12.06 |
| 2026-04-02 12:00 |
10:34:28.97 |
+37:49:04.7 |
HIP 51705 |
10.21 |
| 2026-04-03 00:00 |
10:34:12.83 |
+37:47:53.5 |
HIP 51705 |
9.36 |
| 2026-04-03 12:00 |
10:33:56.92 |
+37:46:40.3 |
HIP 51705 |
9.73 |
| 2026-04-04 00:00 |
10:33:41.24 |
+37:45:25.2 |
HIP 51665 |
6.91 |
| 2026-04-04 12:00 |
10:33:25.79 |
+37:44:08.1 |
HIP 51665 |
4.09 |
| 2026-04-05 00:00 |
10:33:10.57 |
+37:42:49.2 |
HIP 51665 |
2.72 |
| 2026-04-05 12:00 |
10:32:55.59 |
+37:41:28.3 |
HIP 51665 |
4.38 |
| 2026-04-06 00:00 |
10:32:40.85 |
+37:40:05.6 |
HIP 51665 |
7.17 |
| 2026-04-06 12:00 |
10:32:26.34 |
+37:38:41.0 |
HIP 51665 |
10.19 |
| 2026-04-07 00:00 |
10:32:12.07 |
+37:37:14.6 |
HIP 51665 |
13.25 |
| 2026-04-07 12:00 |
10:31:58.04 |
+37:35:46.4 |
HIP 51665 |
16.32 |
| 2026-04-08 00:00 |
10:31:44.25 |
+37:34:16.4 |
HIP 51665 |
19.38 |
| 2026-04-08 12:00 |
10:31:30.70 |
+37:32:44.6 |
HIP 51433 |
18.53 |
| 2026-04-09 00:00 |
10:31:17.39 |
+37:31:11.1 |
HIP 51433 |
17.56 |
| 2026-04-09 12:00 |
10:31:04.32 |
+37:29:35.8 |
HIP 51433 |
17.13 |
| 2026-04-10 00:00 |
10:30:51.50 |
+37:27:58.8 |
HIP 51433 |
17.28 |
| 2026-04-10 12:00 |
10:30:38.92 |
+37:26:20.1 |
HIP 51433 |
17.98 |
| 2026-04-11 00:00 |
10:30:26.58 |
+37:24:39.7 |
HIP 51433 |
19.17 |
| 2026-04-11 12:00 |
10:30:14.49 |
+37:22:57.6 |
HIP 51433 |
20.73 |
| 2026-04-12 00:00 |
10:30:02.65 |
+37:21:13.9 |
HIP 51455 |
20.20 |
| 2026-04-12 12:00 |
10:29:51.05 |
+37:19:28.6 |
HIP 51455 |
19.47 |
| 2026-04-13 00:00 |
10:29:39.70 |
+37:17:41.6 |
HIP 51455 |
19.11 |
| 2026-04-13 12:00 |
10:29:28.60 |
+37:15:53.1 |
HIP 51455 |
19.13 |
| 2026-04-14 00:00 |
10:29:17.75 |
+37:14:03.0 |
HIP 51455 |
19.51 |
| 2026-04-14 12:00 |
10:29:07.14 |
+37:12:11.3 |
HIP 51455 |
20.24 |
| 2026-04-15 00:00 |
10:28:56.79 |
+37:10:18.2 |
HIP 51455 |
21.26 |
| 2026-04-15 12:00 |
10:28:46.68 |
+37:08:23.4 |
HIP 51455 |
22.53 |
| 2026-04-16 00:00 |
10:28:36.82 |
+37:06:27.2 |
HIP 51455 |
24.00 |