メタデータ
| 項目 |
値 |
| Designation |
158P/Kowal-LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-09-25T04:18:05.472000Z |
| Orbit solution date (soln_date, UTC) |
2025-02-13T09:13:06Z |
| Obs used |
1093 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
13.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-07-12.0000000 |
| e |
0.03060860 |
| q (au) |
4.576459 |
| a (au) |
4.720961 |
| i (deg) |
7.907531 |
| Ω (om, deg) |
137.306066 |
| ω (w, deg) |
232.612379 |
| M (ma, deg) |
352.776355 |
等級
散乱 + 全体線形
$$
M_a = (5.344 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.344 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.957 |
| 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 |
| 2018-02-14 |
2025-01-25 |
+18.3296 |
-12.712 |
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 |
06:47:06.96 |
+20:56:52.1 |
HIP 32459 |
10.91 |
| 2026-06-01 12:00 |
06:47:30.56 |
+20:56:42.8 |
HIP 32459 |
15.69 |
| 2026-06-02 00:00 |
06:47:54.21 |
+20:56:33.2 |
HIP 32459 |
20.84 |
| 2026-06-02 12:00 |
06:48:17.90 |
+20:56:23.2 |
HIP 32676 |
24.35 |
| 2026-06-03 00:00 |
06:48:41.64 |
+20:56:12.9 |
HIP 32676 |
22.68 |
| 2026-06-03 12:00 |
06:49:05.42 |
+20:56:02.3 |
HIP 32676 |
22.29 |
| 2026-06-04 00:00 |
06:49:29.25 |
+20:55:51.3 |
HIP 32676 |
23.26 |
| 2026-06-04 12:00 |
06:49:53.12 |
+20:55:39.9 |
HIP 32676 |
25.45 |
| 2026-06-05 00:00 |
06:50:17.03 |
+20:55:28.2 |
HIP 32676 |
28.58 |
| 2026-06-05 12:00 |
06:50:40.98 |
+20:55:16.2 |
HIP 32885 |
31.07 |
| 2026-06-06 00:00 |
06:51:04.98 |
+20:55:03.8 |
HIP 32885 |
30.64 |
| 2026-06-06 12:00 |
06:51:29.02 |
+20:54:51.0 |
HIP 32885 |
31.23 |
| 2026-06-07 00:00 |
06:51:53.09 |
+20:54:37.9 |
HIP 32885 |
32.80 |
| 2026-06-07 12:00 |
06:52:17.21 |
+20:54:24.5 |
HIP 33179 |
32.74 |
| 2026-06-08 00:00 |
06:52:41.36 |
+20:54:10.7 |
HIP 33179 |
28.01 |
| 2026-06-08 12:00 |
06:53:05.56 |
+20:53:56.6 |
HIP 33179 |
23.67 |
| 2026-06-09 00:00 |
06:53:29.79 |
+20:53:42.1 |
HIP 33179 |
20.00 |
| 2026-06-09 12:00 |
06:53:54.05 |
+20:53:27.2 |
HIP 33179 |
17.44 |
| 2026-06-10 00:00 |
06:54:18.36 |
+20:53:12.0 |
HIP 33179 |
16.50 |
| 2026-06-10 12:00 |
06:54:42.70 |
+20:52:56.5 |
HIP 33179 |
17.47 |
| 2026-06-11 00:00 |
06:55:07.07 |
+20:52:40.6 |
HIP 33179 |
20.09 |
| 2026-06-11 12:00 |
06:55:31.48 |
+20:52:24.4 |
HIP 33399 |
18.86 |
| 2026-06-12 00:00 |
06:55:55.92 |
+20:52:07.8 |
HIP 33399 |
13.64 |
| 2026-06-12 12:00 |
06:56:20.40 |
+20:51:50.8 |
HIP 33399 |
9.03 |
| 2026-06-13 00:00 |
06:56:44.90 |
+20:51:33.5 |
HIP 33399 |
6.53 |
| 2026-06-13 12:00 |
06:57:09.44 |
+20:51:15.9 |
HIP 33399 |
8.34 |
| 2026-06-14 00:00 |
06:57:34.01 |
+20:50:57.9 |
HIP 33399 |
12.75 |
| 2026-06-14 12:00 |
06:57:58.61 |
+20:50:39.6 |
HIP 33531 |
16.04 |
| 2026-06-15 00:00 |
06:58:23.23 |
+20:50:20.9 |
HIP 33531 |
16.63 |
| 2026-06-15 12:00 |
06:58:47.89 |
+20:50:01.9 |
HIP 33531 |
19.03 |
| 2026-06-16 00:00 |
06:59:12.57 |
+20:49:42.5 |
HIP 33531 |
22.68 |
| 2026-06-16 12:00 |
06:59:37.28 |
+20:49:22.8 |
HIP 33647 |
22.93 |
| 2026-06-17 00:00 |
07:00:02.02 |
+20:49:02.7 |
HIP 33647 |
24.16 |
| 2026-06-17 12:00 |
07:00:26.77 |
+20:48:42.3 |
HIP 33906 |
24.95 |
| 2026-06-18 00:00 |
07:00:51.56 |
+20:48:21.6 |
HIP 33906 |
19.19 |
| 2026-06-18 12:00 |
07:01:16.37 |
+20:48:00.5 |
HIP 33906 |
13.45 |
| 2026-06-19 00:00 |
07:01:41.19 |
+20:47:39.0 |
HIP 33906 |
7.81 |
| 2026-06-19 12:00 |
07:02:06.05 |
+20:47:17.3 |
HIP 33906 |
2.97 |
| 2026-06-20 00:00 |
07:02:30.92 |
+20:46:55.2 |
HIP 33906 |
4.93 |
| 2026-06-20 12:00 |
07:02:55.81 |
+20:46:32.7 |
HIP 33906 |
10.38 |
| 2026-06-21 00:00 |
07:03:20.72 |
+20:46:09.9 |
HIP 34088 |
16.05 |
| 2026-06-21 12:00 |
07:03:45.65 |
+20:45:46.8 |
HIP 34088 |
12.55 |
| 2026-06-22 00:00 |
07:04:10.60 |
+20:45:23.4 |
HIP 34088 |
11.21 |