メタデータ
| 項目 |
値 |
| Designation |
252P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-03-15T06:19:30.322560Z |
| Orbit solution date (soln_date, UTC) |
2021-09-07T14:01:25Z |
| Obs used |
122 |
| NEO |
Yes |
| M1 |
16.400 |
| K1 |
16.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-06-13.0000000 |
| e |
0.67308502 |
| q (au) |
0.996046 |
| a (au) |
3.046804 |
| i (deg) |
10.422196 |
| Ω (om, deg) |
190.948496 |
| ω (w, deg) |
343.310475 |
| M (ma, deg) |
16.630534 |
等級
散乱 + 全体線形
$$
M_a = (12.317 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.317 |
| n |
6.000 |
| gf |
0.999 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
04:21:35.36 |
+15:42:10.8 |
HIP 20389 |
7.49 |
| 2026-06-01 12:00 |
04:22:36.89 |
+15:44:14.0 |
HIP 20389 |
9.59 |
| 2026-06-02 00:00 |
04:23:38.61 |
+15:46:16.1 |
HIP 20485 |
3.26 |
| 2026-06-02 12:00 |
04:24:40.51 |
+15:48:17.0 |
HIP 20605 |
4.57 |
| 2026-06-03 00:00 |
04:25:42.60 |
+15:50:16.6 |
HIP 20661 |
6.32 |
| 2026-06-03 12:00 |
04:26:44.87 |
+15:52:15.0 |
HIP 20713 |
16.23 |
| 2026-06-04 00:00 |
04:27:47.33 |
+15:54:12.3 |
HIP 20885 |
11.86 |
| 2026-06-04 12:00 |
04:28:49.97 |
+15:56:08.2 |
HIP 20885 |
4.06 |
| 2026-06-05 00:00 |
04:29:52.81 |
+15:58:02.9 |
HIP 21029 |
16.75 |
| 2026-06-05 12:00 |
04:30:55.83 |
+15:59:56.3 |
HIP 21053 |
9.25 |
| 2026-06-06 00:00 |
04:31:59.05 |
+16:01:48.5 |
HIP 21137 |
10.85 |
| 2026-06-06 12:00 |
04:33:02.45 |
+16:03:39.3 |
HIP 21257 |
17.92 |
| 2026-06-07 00:00 |
04:34:06.04 |
+16:05:28.8 |
HIP 21257 |
15.46 |
| 2026-06-07 12:00 |
04:35:09.83 |
+16:07:17.0 |
HIP 21257 |
25.14 |
| 2026-06-08 00:00 |
04:36:13.81 |
+16:09:03.9 |
HIP 21474 |
18.09 |
| 2026-06-08 12:00 |
04:37:17.98 |
+16:10:49.4 |
HIP 21588 |
15.17 |
| 2026-06-09 00:00 |
04:38:22.35 |
+16:12:33.6 |
HIP 21588 |
11.01 |
| 2026-06-09 12:00 |
04:39:26.91 |
+16:14:16.3 |
HIP 21751 |
14.62 |
| 2026-06-10 00:00 |
04:40:31.67 |
+16:15:57.7 |
HIP 21751 |
9.17 |
| 2026-06-10 12:00 |
04:41:36.62 |
+16:17:37.6 |
HIP 21912 |
20.87 |
| 2026-06-11 00:00 |
04:42:41.76 |
+16:19:16.2 |
HIP 21912 |
11.59 |
| 2026-06-11 12:00 |
04:43:47.11 |
+16:20:53.3 |
HIP 21912 |
18.12 |
| 2026-06-12 00:00 |
04:44:52.65 |
+16:22:28.9 |
HIP 22225 |
28.35 |
| 2026-06-12 12:00 |
04:45:58.39 |
+16:24:03.1 |
HIP 22225 |
13.61 |
| 2026-06-13 00:00 |
04:47:04.33 |
+16:25:35.7 |
HIP 22225 |
8.31 |
| 2026-06-13 12:00 |
04:48:10.46 |
+16:27:06.9 |
HIP 22347 |
13.21 |
| 2026-06-14 00:00 |
04:49:16.80 |
+16:28:36.6 |
HIP 22347 |
12.73 |
| 2026-06-14 12:00 |
04:50:23.33 |
+16:30:04.7 |
HIP 22524 |
18.46 |
| 2026-06-15 00:00 |
04:51:30.07 |
+16:31:31.3 |
HIP 22524 |
21.36 |
| 2026-06-15 12:00 |
04:52:37.00 |
+16:32:56.3 |
HIP 22740 |
21.00 |
| 2026-06-16 00:00 |
04:53:44.14 |
+16:34:19.8 |
HIP 22740 |
15.28 |
| 2026-06-16 12:00 |
04:54:51.47 |
+16:35:41.7 |
HIP 22846 |
12.53 |
| 2026-06-17 00:00 |
04:55:59.01 |
+16:37:01.9 |
HIP 22990 |
13.58 |
| 2026-06-17 12:00 |
04:57:06.75 |
+16:38:20.6 |
HIP 22990 |
7.34 |
| 2026-06-18 00:00 |
04:58:14.69 |
+16:39:37.6 |
HIP 22990 |
21.34 |
| 2026-06-18 12:00 |
04:59:22.84 |
+16:40:53.0 |
HIP 23227 |
11.47 |
| 2026-06-19 00:00 |
05:00:31.19 |
+16:42:06.7 |
HIP 23227 |
11.89 |
| 2026-06-19 12:00 |
05:01:39.74 |
+16:43:18.7 |
HIP 23227 |
26.32 |
| 2026-06-20 00:00 |
05:02:48.50 |
+16:44:29.1 |
HIP 23574 |
29.46 |
| 2026-06-20 12:00 |
05:03:57.46 |
+16:45:37.7 |
HIP 23574 |
21.95 |
| 2026-06-21 00:00 |
05:05:06.63 |
+16:46:44.7 |
HIP 23574 |
25.41 |
| 2026-06-21 12:00 |
05:06:16.00 |
+16:47:49.9 |
HIP 23807 |
11.02 |
| 2026-06-22 00:00 |
05:07:25.59 |
+16:48:53.3 |
HIP 23810 |
5.59 |