メタデータ
| 項目 |
値 |
| Designation |
P/1996 R2 (Lagerkvist) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
1997-01-19T04:33:27.567360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:50Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
20.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1996-10-08.0000000 |
| e |
0.30999078 |
| q (au) |
2.609642 |
| a (au) |
3.782040 |
| i (deg) |
2.605342 |
| Ω (om, deg) |
40.240561 |
| ω (w, deg) |
334.042486 |
| M (ma, deg) |
346.172231 |
等級
散乱 + 全体線形
$$
M_a = (8.462 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.462 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
01:35:44.73 |
+08:49:41.3 |
HIP 7525 |
17.00 |
| 2026-06-01 12:00 |
01:36:32.89 |
+08:54:30.8 |
HIP 7525 |
5.74 |
| 2026-06-02 00:00 |
01:37:21.02 |
+08:59:19.5 |
HIP 7525 |
10.31 |
| 2026-06-02 12:00 |
01:38:09.10 |
+09:04:07.5 |
HIP 7525 |
22.53 |
| 2026-06-03 00:00 |
01:38:57.15 |
+09:08:54.7 |
HIP 7819 |
33.52 |
| 2026-06-03 12:00 |
01:39:45.15 |
+09:13:41.1 |
HIP 7883 |
26.40 |
| 2026-06-04 00:00 |
01:40:33.11 |
+09:18:26.7 |
HIP 7883 |
19.06 |
| 2026-06-04 12:00 |
01:41:21.03 |
+09:23:11.6 |
HIP 7883 |
18.84 |
| 2026-06-05 00:00 |
01:42:08.91 |
+09:27:55.6 |
HIP 8078 |
24.48 |
| 2026-06-05 12:00 |
01:42:56.75 |
+09:32:38.8 |
HIP 8078 |
11.98 |
| 2026-06-06 00:00 |
01:43:44.54 |
+09:37:21.3 |
HIP 8078 |
3.23 |
| 2026-06-06 12:00 |
01:44:32.29 |
+09:42:02.9 |
HIP 8113 |
8.85 |
| 2026-06-07 00:00 |
01:45:19.99 |
+09:46:43.7 |
HIP 8113 |
20.19 |
| 2026-06-07 12:00 |
01:46:07.65 |
+09:51:23.7 |
HIP 8113 |
32.50 |
| 2026-06-08 00:00 |
01:46:55.26 |
+09:56:02.9 |
HIP 8416 |
29.83 |
| 2026-06-08 12:00 |
01:47:42.82 |
+10:00:41.2 |
HIP 8416 |
17.76 |
| 2026-06-09 00:00 |
01:48:30.34 |
+10:05:18.7 |
HIP 8416 |
7.67 |
| 2026-06-09 12:00 |
01:49:17.81 |
+10:09:55.3 |
HIP 8416 |
10.88 |
| 2026-06-10 00:00 |
01:50:05.23 |
+10:14:31.1 |
HIP 8416 |
22.19 |
| 2026-06-10 12:00 |
01:50:52.60 |
+10:19:06.1 |
HIP 8708 |
34.17 |
| 2026-06-11 00:00 |
01:51:39.92 |
+10:23:40.2 |
HIP 8708 |
25.58 |
| 2026-06-11 12:00 |
01:52:27.18 |
+10:28:13.4 |
HIP 8708 |
21.29 |
| 2026-06-12 00:00 |
01:53:14.40 |
+10:32:45.7 |
HIP 8859 |
11.43 |
| 2026-06-12 12:00 |
01:54:01.56 |
+10:37:17.2 |
HIP 8859 |
1.01 |
| 2026-06-13 00:00 |
01:54:48.67 |
+10:41:47.7 |
HIP 8904 |
9.39 |
| 2026-06-13 12:00 |
01:55:35.72 |
+10:46:17.4 |
HIP 8904 |
14.73 |
| 2026-06-14 00:00 |
01:56:22.72 |
+10:50:46.2 |
HIP 8904 |
25.54 |
| 2026-06-14 12:00 |
01:57:09.66 |
+10:55:14.1 |
HIP 9210 |
20.87 |
| 2026-06-15 00:00 |
01:57:56.54 |
+10:59:41.1 |
HIP 9210 |
14.45 |
| 2026-06-15 12:00 |
01:58:43.36 |
+11:04:07.1 |
HIP 9210 |
16.92 |
| 2026-06-16 00:00 |
01:59:30.13 |
+11:08:32.3 |
HIP 9210 |
25.81 |
| 2026-06-16 12:00 |
02:00:16.83 |
+11:12:56.5 |
HIP 9369 |
35.18 |
| 2026-06-17 00:00 |
02:01:03.47 |
+11:17:19.8 |
HIP 9561 |
26.93 |
| 2026-06-17 12:00 |
02:01:50.05 |
+11:21:42.2 |
HIP 9561 |
15.06 |
| 2026-06-18 00:00 |
02:02:36.56 |
+11:26:03.6 |
HIP 9561 |
5.21 |
| 2026-06-18 12:00 |
02:03:23.01 |
+11:30:24.1 |
HIP 9561 |
11.18 |
| 2026-06-19 00:00 |
02:04:09.40 |
+11:34:43.6 |
HIP 9709 |
15.00 |
| 2026-06-19 12:00 |
02:04:55.72 |
+11:39:02.2 |
HIP 9709 |
14.75 |
| 2026-06-20 00:00 |
02:05:41.98 |
+11:43:19.9 |
HIP 9709 |
22.44 |
| 2026-06-20 12:00 |
02:06:28.16 |
+11:47:36.6 |
HIP 9764 |
26.42 |
| 2026-06-21 00:00 |
02:07:14.28 |
+11:51:52.3 |
HIP 9764 |
31.03 |
| 2026-06-21 12:00 |
02:08:00.34 |
+11:56:07.1 |
HIP 10118 |
32.99 |
| 2026-06-22 00:00 |
02:08:46.32 |
+12:00:21.0 |
HIP 10118 |
20.98 |