メタデータ
| 項目 |
値 |
| Designation |
P/2012 NJ (La Sagra) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-06-13T02:10:00.287040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:19Z |
| Obs used |
2490 |
| NEO |
Yes |
| M1 |
14.800 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-08-19.0000000 |
| e |
0.84806204 |
| q (au) |
1.291890 |
| a (au) |
8.502747 |
| i (deg) |
84.375461 |
| Ω (om, deg) |
315.763185 |
| ω (w, deg) |
338.413906 |
| M (ma, deg) |
2.659833 |
等級
散乱 + 全体線形
$$
M_a = (15.413 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.413 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
09:12:34.73 |
+34:42:16.0 |
HIP 45053 |
25.52 |
| 2026-05-12 12:00 |
09:12:35.25 |
+34:41:26.6 |
HIP 45053 |
25.46 |
| 2026-05-13 00:00 |
09:12:35.84 |
+34:40:37.1 |
HIP 45053 |
25.44 |
| 2026-05-13 12:00 |
09:12:36.51 |
+34:39:47.3 |
HIP 45053 |
25.47 |
| 2026-05-14 00:00 |
09:12:37.25 |
+34:38:57.3 |
HIP 45053 |
25.53 |
| 2026-05-14 12:00 |
09:12:38.06 |
+34:38:07.2 |
HIP 45053 |
25.64 |
| 2026-05-15 00:00 |
09:12:38.95 |
+34:37:16.9 |
HIP 45053 |
25.79 |
| 2026-05-15 12:00 |
09:12:39.91 |
+34:36:26.4 |
HIP 45053 |
25.98 |
| 2026-05-16 00:00 |
09:12:40.94 |
+34:35:35.7 |
HIP 45053 |
26.22 |
| 2026-05-16 12:00 |
09:12:42.04 |
+34:34:44.9 |
HIP 45053 |
26.50 |
| 2026-05-17 00:00 |
09:12:43.21 |
+34:33:53.9 |
HIP 45053 |
26.81 |
| 2026-05-17 12:00 |
09:12:44.46 |
+34:33:02.7 |
HIP 45053 |
27.17 |
| 2026-05-18 00:00 |
09:12:45.77 |
+34:32:11.4 |
HIP 45053 |
27.57 |
| 2026-05-18 12:00 |
09:12:47.16 |
+34:31:19.9 |
HIP 45053 |
28.00 |
| 2026-05-19 00:00 |
09:12:48.62 |
+34:30:28.2 |
HIP 45053 |
28.48 |
| 2026-05-19 12:00 |
09:12:50.15 |
+34:29:36.4 |
HIP 45053 |
28.98 |
| 2026-05-20 00:00 |
09:12:51.74 |
+34:28:44.5 |
HIP 45053 |
29.53 |
| 2026-05-20 12:00 |
09:12:53.41 |
+34:27:52.4 |
HIP 45053 |
30.10 |
| 2026-05-21 00:00 |
09:12:55.14 |
+34:27:00.2 |
HIP 45412 |
30.71 |
| 2026-05-21 12:00 |
09:12:56.95 |
+34:26:07.8 |
HIP 45412 |
30.69 |
| 2026-05-22 00:00 |
09:12:58.82 |
+34:25:15.3 |
HIP 45412 |
30.69 |
| 2026-05-22 12:00 |
09:13:00.76 |
+34:24:22.7 |
HIP 45412 |
30.71 |
| 2026-05-23 00:00 |
09:13:02.77 |
+34:23:29.9 |
HIP 45412 |
30.74 |
| 2026-05-23 12:00 |
09:13:04.85 |
+34:22:37.0 |
HIP 45412 |
30.80 |
| 2026-05-24 00:00 |
09:13:06.99 |
+34:21:44.0 |
HIP 45412 |
30.88 |
| 2026-05-24 12:00 |
09:13:09.20 |
+34:20:50.8 |
HIP 45412 |
30.98 |
| 2026-05-25 00:00 |
09:13:11.47 |
+34:19:57.6 |
HIP 45412 |
31.09 |
| 2026-05-25 12:00 |
09:13:13.82 |
+34:19:04.2 |
HIP 45412 |
31.24 |
| 2026-05-26 00:00 |
09:13:16.22 |
+34:18:10.7 |
HIP 45412 |
31.40 |
| 2026-05-26 12:00 |
09:13:18.70 |
+34:17:17.1 |
HIP 45325 |
30.54 |
| 2026-05-27 00:00 |
09:13:21.23 |
+34:16:23.4 |
HIP 45325 |
29.51 |
| 2026-05-27 12:00 |
09:13:23.84 |
+34:15:29.6 |
HIP 45325 |
28.48 |
| 2026-05-28 00:00 |
09:13:26.50 |
+34:14:35.7 |
HIP 45325 |
27.44 |
| 2026-05-28 12:00 |
09:13:29.23 |
+34:13:41.7 |
HIP 45325 |
26.40 |
| 2026-05-29 00:00 |
09:13:32.03 |
+34:12:47.6 |
HIP 45325 |
25.35 |
| 2026-05-29 12:00 |
09:13:34.88 |
+34:11:53.4 |
HIP 45325 |
24.30 |
| 2026-05-30 00:00 |
09:13:37.81 |
+34:10:59.1 |
HIP 45325 |
23.24 |
| 2026-05-30 12:00 |
09:13:40.79 |
+34:10:04.7 |
HIP 45325 |
22.19 |
| 2026-05-31 00:00 |
09:13:43.83 |
+34:09:10.2 |
HIP 45325 |
21.13 |
| 2026-05-31 12:00 |
09:13:46.94 |
+34:08:15.6 |
HIP 45325 |
20.07 |
| 2026-06-01 00:00 |
09:13:50.11 |
+34:07:21.0 |
HIP 45325 |
19.01 |
| 2026-06-01 12:00 |
09:13:53.34 |
+34:06:26.3 |
HIP 45325 |
17.96 |
| 2026-06-02 00:00 |
09:13:56.63 |
+34:05:31.5 |
HIP 45325 |
16.91 |