メタデータ
| 項目 |
値 |
| Designation |
269P/Jedicke |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-11-25T22:04:56.112960Z |
| Orbit solution date (soln_date, UTC) |
2023-05-03T22:44:27Z |
| Obs used |
904 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
12.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-11-07.0000000 |
| e |
0.43469217 |
| q (au) |
4.077250 |
| a (au) |
7.212443 |
| i (deg) |
6.611643 |
| Ω (om, deg) |
248.991032 |
| ω (w, deg) |
223.915918 |
| M (ma, deg) |
266.123247 |
等級
散乱 + 全体線形
$$
M_a = (4.141 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.141 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.932 |
| 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 |
| 2012-09-11 |
2013-11-03 |
+7.2265 |
-4.196 |
| 2013-11-03 |
2014-11-25 |
+12.8920 |
-8.168 |
| 2014-12-14 |
2016-03-13 |
+7.6679 |
-4.901 |
| 2016-03-13 |
2017-03-21 |
+16.4470 |
-11.763 |
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) |
| 2026-03-26 00:00 |
20:43:36.04 |
-11:54:49.4 |
HIP 102291 |
16.34 |
| 2026-03-26 12:00 |
20:43:45.22 |
-11:53:55.7 |
HIP 102291 |
15.65 |
| 2026-03-27 00:00 |
20:43:54.32 |
-11:53:02.1 |
HIP 102291 |
15.31 |
| 2026-03-27 12:00 |
20:44:03.36 |
-11:52:08.6 |
HIP 102291 |
15.35 |
| 2026-03-28 00:00 |
20:44:12.33 |
-11:51:15.3 |
HIP 102342 |
15.06 |
| 2026-03-28 12:00 |
20:44:21.22 |
-11:50:22.2 |
HIP 102342 |
14.46 |
| 2026-03-29 00:00 |
20:44:30.05 |
-11:49:29.2 |
HIP 102342 |
14.22 |
| 2026-03-29 12:00 |
20:44:38.80 |
-11:48:36.3 |
HIP 102342 |
14.36 |
| 2026-03-30 00:00 |
20:44:47.47 |
-11:47:43.6 |
HIP 102342 |
14.85 |
| 2026-03-30 12:00 |
20:44:56.08 |
-11:46:51.1 |
HIP 102342 |
15.66 |
| 2026-03-31 00:00 |
20:45:04.61 |
-11:45:58.8 |
HIP 102342 |
16.73 |
| 2026-03-31 12:00 |
20:45:13.07 |
-11:45:06.6 |
HIP 102342 |
18.00 |
| 2026-04-01 00:00 |
20:45:21.45 |
-11:44:14.6 |
HIP 102342 |
19.44 |
| 2026-04-01 12:00 |
20:45:29.76 |
-11:43:22.7 |
HIP 102342 |
21.00 |
| 2026-04-02 00:00 |
20:45:37.99 |
-11:42:31.1 |
HIP 102342 |
22.65 |
| 2026-04-02 12:00 |
20:45:46.15 |
-11:41:39.6 |
HIP 102342 |
24.37 |
| 2026-04-03 00:00 |
20:45:54.23 |
-11:40:48.3 |
HIP 102342 |
26.14 |
| 2026-04-03 12:00 |
20:46:02.23 |
-11:39:57.2 |
HIP 102342 |
27.95 |
| 2026-04-04 00:00 |
20:46:10.16 |
-11:39:06.2 |
HIP 102342 |
29.78 |
| 2026-04-04 12:00 |
20:46:18.01 |
-11:38:15.5 |
HIP 102342 |
31.63 |
| 2026-04-05 00:00 |
20:46:25.78 |
-11:37:24.9 |
HIP 102342 |
33.49 |
| 2026-04-05 12:00 |
20:46:33.48 |
-11:36:34.6 |
HIP 102342 |
35.35 |
| 2026-04-06 00:00 |
20:46:41.10 |
-11:35:44.4 |
HIP 102342 |
37.22 |
| 2026-04-06 12:00 |
20:46:48.63 |
-11:34:54.5 |
HIP 102785 |
39.07 |
| 2026-04-07 00:00 |
20:46:56.09 |
-11:34:04.8 |
HIP 102785 |
37.12 |
| 2026-04-07 12:00 |
20:47:03.47 |
-11:33:15.2 |
HIP 102785 |
35.20 |
| 2026-04-08 00:00 |
20:47:10.77 |
-11:32:25.9 |
HIP 102785 |
33.30 |
| 2026-04-08 12:00 |
20:47:17.98 |
-11:31:36.8 |
HIP 102785 |
31.43 |
| 2026-04-09 00:00 |
20:47:25.12 |
-11:30:47.9 |
HIP 102785 |
29.60 |
| 2026-04-09 12:00 |
20:47:32.17 |
-11:29:59.2 |
HIP 102785 |
27.79 |
| 2026-04-10 00:00 |
20:47:39.15 |
-11:29:10.8 |
HIP 102785 |
26.02 |
| 2026-04-10 12:00 |
20:47:46.04 |
-11:28:22.6 |
HIP 102785 |
24.29 |
| 2026-04-11 00:00 |
20:47:52.84 |
-11:27:34.6 |
HIP 102785 |
22.60 |
| 2026-04-11 12:00 |
20:47:59.57 |
-11:26:46.9 |
HIP 102785 |
20.96 |
| 2026-04-12 00:00 |
20:48:06.21 |
-11:25:59.4 |
HIP 102785 |
19.37 |
| 2026-04-12 12:00 |
20:48:12.76 |
-11:25:12.1 |
HIP 102785 |
17.84 |
| 2026-04-13 00:00 |
20:48:19.23 |
-11:24:25.1 |
HIP 102785 |
16.39 |
| 2026-04-13 12:00 |
20:48:25.62 |
-11:23:38.3 |
HIP 102785 |
15.02 |
| 2026-04-14 00:00 |
20:48:31.92 |
-11:22:51.8 |
HIP 102785 |
13.76 |
| 2026-04-14 12:00 |
20:48:38.13 |
-11:22:05.5 |
HIP 102785 |
12.63 |
| 2026-04-15 00:00 |
20:48:44.26 |
-11:21:19.5 |
HIP 102785 |
11.65 |
| 2026-04-15 12:00 |
20:48:50.30 |
-11:20:33.7 |
HIP 102785 |
10.86 |
| 2026-04-16 00:00 |
20:48:56.26 |
-11:19:48.2 |
HIP 102785 |
10.30 |