メタデータ
| 項目 |
値 |
| Designation |
P/2010 E2 (Jarnac) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-04-07T22:14:05.470080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:41Z |
| Obs used |
344 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-04-02.0000000 |
| e |
0.72237010 |
| q (au) |
2.398733 |
| a (au) |
8.640039 |
| i (deg) |
15.437000 |
| Ω (om, deg) |
177.899371 |
| ω (w, deg) |
8.294555 |
| M (ma, deg) |
359.770001 |
等級
散乱 + 全体線形
$$
M_a = (11.468 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.468 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-07-29 00:00 |
01:30:09.77 |
+03:27:47.0 |
HIP 6922 |
24.79 |
| 2026-07-29 12:00 |
01:30:09.43 |
+03:27:27.2 |
HIP 6922 |
25.00 |
| 2026-07-30 00:00 |
01:30:09.03 |
+03:27:07.0 |
HIP 6922 |
25.21 |
| 2026-07-30 12:00 |
01:30:08.57 |
+03:26:46.4 |
HIP 6922 |
25.41 |
| 2026-07-31 00:00 |
01:30:08.04 |
+03:26:25.4 |
HIP 6922 |
25.61 |
| 2026-07-31 12:00 |
01:30:07.44 |
+03:26:04.0 |
HIP 6922 |
25.81 |
| 2026-08-01 00:00 |
01:30:06.77 |
+03:25:42.3 |
HIP 6922 |
26.02 |
| 2026-08-01 12:00 |
01:30:06.05 |
+03:25:20.2 |
HIP 6922 |
26.22 |
| 2026-08-02 00:00 |
01:30:05.25 |
+03:24:57.7 |
HIP 6922 |
26.42 |
| 2026-08-02 12:00 |
01:30:04.39 |
+03:24:34.8 |
HIP 6922 |
26.63 |
| 2026-08-03 00:00 |
01:30:03.46 |
+03:24:11.5 |
HIP 7022 |
26.70 |
| 2026-08-03 12:00 |
01:30:02.47 |
+03:23:47.9 |
HIP 7022 |
26.38 |
| 2026-08-04 00:00 |
01:30:01.41 |
+03:23:23.8 |
HIP 7022 |
26.06 |
| 2026-08-04 12:00 |
01:30:00.28 |
+03:22:59.4 |
HIP 7022 |
25.75 |
| 2026-08-05 00:00 |
01:29:59.09 |
+03:22:34.6 |
HIP 7022 |
25.44 |
| 2026-08-05 12:00 |
01:29:57.84 |
+03:22:09.5 |
HIP 7022 |
25.13 |
| 2026-08-06 00:00 |
01:29:56.51 |
+03:21:43.9 |
HIP 7022 |
24.83 |
| 2026-08-06 12:00 |
01:29:55.12 |
+03:21:18.0 |
HIP 7022 |
24.54 |
| 2026-08-07 00:00 |
01:29:53.67 |
+03:20:51.7 |
HIP 7022 |
24.26 |
| 2026-08-07 12:00 |
01:29:52.15 |
+03:20:25.0 |
HIP 7022 |
23.99 |
| 2026-08-08 00:00 |
01:29:50.56 |
+03:19:58.0 |
HIP 7022 |
23.74 |
| 2026-08-08 12:00 |
01:29:48.91 |
+03:19:30.6 |
HIP 7022 |
23.49 |
| 2026-08-09 00:00 |
01:29:47.19 |
+03:19:02.8 |
HIP 7022 |
23.27 |
| 2026-08-09 12:00 |
01:29:45.40 |
+03:18:34.7 |
HIP 7022 |
23.06 |
| 2026-08-10 00:00 |
01:29:43.55 |
+03:18:06.2 |
HIP 7022 |
22.87 |
| 2026-08-10 12:00 |
01:29:41.64 |
+03:17:37.3 |
HIP 7022 |
22.70 |
| 2026-08-11 00:00 |
01:29:39.66 |
+03:17:08.1 |
HIP 7022 |
22.55 |
| 2026-08-11 12:00 |
01:29:37.61 |
+03:16:38.5 |
HIP 7022 |
22.43 |
| 2026-08-12 00:00 |
01:29:35.50 |
+03:16:08.6 |
HIP 7022 |
22.33 |
| 2026-08-12 12:00 |
01:29:33.32 |
+03:15:38.3 |
HIP 7022 |
22.27 |
| 2026-08-13 00:00 |
01:29:31.08 |
+03:15:07.6 |
HIP 7022 |
22.23 |
| 2026-08-13 12:00 |
01:29:28.77 |
+03:14:36.6 |
HIP 7022 |
22.23 |
| 2026-08-14 00:00 |
01:29:26.40 |
+03:14:05.3 |
HIP 7022 |
22.26 |
| 2026-08-14 12:00 |
01:29:23.96 |
+03:13:33.6 |
HIP 7022 |
22.33 |
| 2026-08-15 00:00 |
01:29:21.46 |
+03:13:01.5 |
HIP 7022 |
22.43 |
| 2026-08-15 12:00 |
01:29:18.90 |
+03:12:29.1 |
HIP 7022 |
22.57 |
| 2026-08-16 00:00 |
01:29:16.27 |
+03:11:56.4 |
HIP 7022 |
22.75 |
| 2026-08-16 12:00 |
01:29:13.58 |
+03:11:23.3 |
HIP 7022 |
22.98 |
| 2026-08-17 00:00 |
01:29:10.82 |
+03:10:49.9 |
HIP 7022 |
23.24 |
| 2026-08-17 12:00 |
01:29:08.00 |
+03:10:16.2 |
HIP 7022 |
23.54 |
| 2026-08-18 00:00 |
01:29:05.12 |
+03:09:42.1 |
HIP 7022 |
23.89 |
| 2026-08-18 12:00 |
01:29:02.18 |
+03:09:07.7 |
HIP 7022 |
24.27 |
| 2026-08-19 00:00 |
01:28:59.17 |
+03:08:33.0 |
HIP 7022 |
24.70 |