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) |
| 2026-09-20 00:00 |
08:13:42.18 |
+18:34:48.1 |
HIP 40187 |
17.08 |
| 2026-09-20 12:00 |
08:14:00.03 |
+18:34:00.6 |
HIP 40187 |
21.10 |
| 2026-09-21 00:00 |
08:14:17.77 |
+18:33:13.4 |
HIP 40187 |
25.20 |
| 2026-09-21 12:00 |
08:14:35.42 |
+18:32:26.4 |
HIP 40483 |
21.71 |
| 2026-09-22 00:00 |
08:14:52.96 |
+18:31:39.6 |
HIP 40483 |
18.45 |
| 2026-09-22 12:00 |
08:15:10.40 |
+18:30:53.0 |
HIP 40483 |
15.66 |
| 2026-09-23 00:00 |
08:15:27.74 |
+18:30:06.6 |
HIP 40483 |
13.63 |
| 2026-09-23 12:00 |
08:15:44.97 |
+18:29:20.4 |
HIP 40483 |
12.70 |
| 2026-09-24 00:00 |
08:16:02.10 |
+18:28:34.5 |
HIP 40483 |
13.09 |
| 2026-09-24 12:00 |
08:16:19.13 |
+18:27:48.8 |
HIP 40483 |
14.67 |
| 2026-09-25 00:00 |
08:16:36.04 |
+18:27:03.3 |
HIP 40483 |
17.09 |
| 2026-09-25 12:00 |
08:16:52.85 |
+18:26:18.1 |
HIP 40483 |
20.03 |
| 2026-09-26 00:00 |
08:17:09.56 |
+18:25:33.1 |
HIP 40564 |
21.05 |
| 2026-09-26 12:00 |
08:17:26.15 |
+18:24:48.4 |
HIP 40733 |
21.10 |
| 2026-09-27 00:00 |
08:17:42.64 |
+18:24:03.9 |
HIP 40733 |
17.14 |
| 2026-09-27 12:00 |
08:17:59.02 |
+18:23:19.7 |
HIP 40733 |
13.21 |
| 2026-09-28 00:00 |
08:18:15.28 |
+18:22:35.7 |
HIP 40733 |
9.33 |
| 2026-09-28 12:00 |
08:18:31.44 |
+18:21:52.0 |
HIP 40733 |
5.55 |
| 2026-09-29 00:00 |
08:18:47.48 |
+18:21:08.6 |
HIP 40733 |
2.22 |
| 2026-09-29 12:00 |
08:19:03.42 |
+18:20:25.4 |
HIP 40733 |
3.01 |
| 2026-09-30 00:00 |
08:19:19.24 |
+18:19:42.6 |
HIP 40733 |
6.51 |
| 2026-09-30 12:00 |
08:19:34.94 |
+18:19:00.0 |
HIP 40733 |
10.22 |
| 2026-10-01 00:00 |
08:19:50.53 |
+18:18:17.7 |
HIP 40747 |
13.84 |
| 2026-10-01 12:00 |
08:20:06.01 |
+18:17:35.7 |
HIP 40747 |
16.56 |
| 2026-10-02 00:00 |
08:20:21.36 |
+18:16:54.0 |
HIP 40747 |
19.59 |
| 2026-10-02 12:00 |
08:20:36.61 |
+18:16:12.6 |
HIP 40747 |
22.80 |
| 2026-10-03 00:00 |
08:20:51.73 |
+18:15:31.6 |
HIP 40747 |
26.11 |
| 2026-10-03 12:00 |
08:21:06.73 |
+18:14:50.8 |
HIP 40747 |
29.48 |
| 2026-10-04 00:00 |
08:21:21.62 |
+18:14:10.4 |
HIP 41117 |
29.12 |
| 2026-10-04 12:00 |
08:21:36.38 |
+18:13:30.3 |
HIP 41117 |
25.85 |
| 2026-10-05 00:00 |
08:21:51.03 |
+18:12:50.5 |
HIP 41117 |
22.70 |
| 2026-10-05 12:00 |
08:22:05.55 |
+18:12:11.1 |
HIP 41120 |
19.48 |
| 2026-10-06 00:00 |
08:22:19.95 |
+18:11:32.0 |
HIP 41120 |
16.00 |
| 2026-10-06 12:00 |
08:22:34.22 |
+18:10:53.3 |
HIP 41120 |
12.55 |
| 2026-10-07 00:00 |
08:22:48.37 |
+18:10:14.9 |
HIP 41120 |
9.14 |
| 2026-10-07 12:00 |
08:23:02.39 |
+18:09:36.9 |
HIP 41120 |
5.75 |
| 2026-10-08 00:00 |
08:23:16.29 |
+18:08:59.2 |
HIP 41120 |
2.40 |
| 2026-10-08 12:00 |
08:23:30.05 |
+18:08:22.0 |
HIP 41120 |
1.02 |
| 2026-10-09 00:00 |
08:23:43.69 |
+18:07:45.1 |
HIP 41120 |
4.27 |
| 2026-10-09 12:00 |
08:23:57.21 |
+18:07:08.6 |
HIP 41120 |
7.53 |
| 2026-10-10 00:00 |
08:24:10.59 |
+18:06:32.5 |
HIP 41120 |
10.76 |
| 2026-10-10 12:00 |
08:24:23.84 |
+18:05:56.7 |
HIP 41120 |
13.96 |
| 2026-10-11 00:00 |
08:24:36.96 |
+18:05:21.4 |
HIP 41120 |
17.13 |