メタデータ
| 項目 |
値 |
| Designation |
187P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-10-22T14:00:37.010880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:48Z |
| Obs used |
296 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
16.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-02-09.0000000 |
| e |
0.17318236 |
| q (au) |
3.715328 |
| a (au) |
4.493528 |
| i (deg) |
13.655086 |
| Ω (om, deg) |
111.736093 |
| ω (w, deg) |
134.735817 |
| M (ma, deg) |
86.856101 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
11:56:40.99 |
+11:15:00.2 |
HIP 58171 |
12.75 |
| 2026-09-20 12:00 |
11:57:13.49 |
+11:11:50.5 |
HIP 58212 |
16.48 |
| 2026-09-21 00:00 |
11:57:46.00 |
+11:08:41.1 |
HIP 58212 |
22.12 |
| 2026-09-21 12:00 |
11:58:18.52 |
+11:05:31.8 |
HIP 58212 |
29.23 |
| 2026-09-22 00:00 |
11:58:51.05 |
+11:02:22.8 |
HIP 58212 |
36.97 |
| 2026-09-22 12:00 |
11:59:23.58 |
+10:59:14.0 |
HIP 58652 |
33.52 |
| 2026-09-23 00:00 |
11:59:56.11 |
+10:56:05.4 |
HIP 58652 |
26.44 |
| 2026-09-23 12:00 |
12:00:28.65 |
+10:52:57.1 |
HIP 58652 |
20.53 |
| 2026-09-24 00:00 |
12:01:01.20 |
+10:49:49.0 |
HIP 58652 |
17.05 |
| 2026-09-24 12:00 |
12:01:33.75 |
+10:46:41.1 |
HIP 58652 |
17.52 |
| 2026-09-25 00:00 |
12:02:06.30 |
+10:43:33.5 |
HIP 58652 |
21.69 |
| 2026-09-25 12:00 |
12:02:38.86 |
+10:40:26.2 |
HIP 58646 |
25.32 |
| 2026-09-26 00:00 |
12:03:11.42 |
+10:37:19.1 |
HIP 58646 |
29.23 |
| 2026-09-26 12:00 |
12:03:43.98 |
+10:34:12.3 |
HIP 58968 |
34.56 |
| 2026-09-27 00:00 |
12:04:16.55 |
+10:31:05.7 |
HIP 59025 |
27.01 |
| 2026-09-27 12:00 |
12:04:49.11 |
+10:27:59.4 |
HIP 59025 |
18.95 |
| 2026-09-28 00:00 |
12:05:21.68 |
+10:24:53.4 |
HIP 59025 |
11.64 |
| 2026-09-28 12:00 |
12:05:54.25 |
+10:21:47.7 |
HIP 59025 |
7.71 |
| 2026-09-29 00:00 |
12:06:26.82 |
+10:18:42.3 |
HIP 59025 |
11.43 |
| 2026-09-29 12:00 |
12:06:59.40 |
+10:15:37.1 |
HIP 59110 |
16.78 |
| 2026-09-30 00:00 |
12:07:31.97 |
+10:12:32.2 |
HIP 59110 |
19.75 |
| 2026-09-30 12:00 |
12:08:04.54 |
+10:09:27.7 |
HIP 59110 |
25.41 |
| 2026-10-01 00:00 |
12:08:37.11 |
+10:06:23.4 |
HIP 59110 |
32.38 |
| 2026-10-01 12:00 |
12:09:09.68 |
+10:03:19.5 |
HIP 59100 |
37.58 |
| 2026-10-02 00:00 |
12:09:42.26 |
+10:00:15.8 |
HIP 59100 |
42.57 |
| 2026-10-02 12:00 |
12:10:14.82 |
+09:57:12.5 |
HIP 59572 |
40.35 |
| 2026-10-03 00:00 |
12:10:47.39 |
+09:54:09.6 |
HIP 59572 |
33.04 |
| 2026-10-03 12:00 |
12:11:19.96 |
+09:51:06.9 |
HIP 59572 |
26.48 |
| 2026-10-04 00:00 |
12:11:52.52 |
+09:48:04.6 |
HIP 59572 |
21.40 |
| 2026-10-04 12:00 |
12:12:25.08 |
+09:45:02.6 |
HIP 59572 |
19.02 |
| 2026-10-05 00:00 |
12:12:57.63 |
+09:42:01.0 |
HIP 59572 |
20.30 |
| 2026-10-05 12:00 |
12:13:30.18 |
+09:38:59.7 |
HIP 59610 |
23.54 |
| 2026-10-06 00:00 |
12:14:02.73 |
+09:35:58.8 |
HIP 59737 |
27.47 |
| 2026-10-06 12:00 |
12:14:35.27 |
+09:32:58.3 |
HIP 59737 |
27.10 |
| 2026-10-07 00:00 |
12:15:07.80 |
+09:29:58.1 |
HIP 59737 |
29.34 |
| 2026-10-07 12:00 |
12:15:40.33 |
+09:26:58.4 |
HIP 59804 |
24.97 |
| 2026-10-08 00:00 |
12:16:12.85 |
+09:23:59.0 |
HIP 59804 |
22.69 |
| 2026-10-08 12:00 |
12:16:45.36 |
+09:21:00.0 |
HIP 59804 |
23.51 |
| 2026-10-09 00:00 |
12:17:17.87 |
+09:18:01.4 |
HIP 59804 |
27.15 |
| 2026-10-09 12:00 |
12:17:50.37 |
+09:15:03.2 |
HIP 60092 |
26.33 |
| 2026-10-10 00:00 |
12:18:22.85 |
+09:12:05.5 |
HIP 60092 |
21.77 |
| 2026-10-10 12:00 |
12:18:55.33 |
+09:09:08.1 |
HIP 60092 |
20.00 |
| 2026-10-11 00:00 |
12:19:27.79 |
+09:06:11.2 |
HIP 60092 |
21.72 |