メタデータ
| 項目 |
値 |
| Designation |
C/2007 N3 (Lulin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-01-10T15:21:20.111040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:10Z |
| Obs used |
3853 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
6.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-12-05.0000000 |
| e |
0.99998362 |
| q (au) |
1.212259 |
| a (au) |
74017.562220 |
| i (deg) |
178.373611 |
| Ω (om, deg) |
338.535163 |
| ω (w, deg) |
136.862191 |
| M (ma, deg) |
359.999998 |
等級
散乱 + 全体線形
$$
M_a = (11.207 + 3.193\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.207 |
| n |
3.193 |
| gf |
1.000 |
| gb |
-0.711 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2007-07-11 |
2007-11-01 |
+6.9416 |
-5.422 |
| 2007-11-01 |
2008-03-31 |
+15.1159 |
-11.353 |
| 2008-03-31 |
2008-08-20 |
-8.4186 |
+3.052 |
| 2008-08-20 |
2008-10-02 |
+13.2417 |
-5.726 |
| 2008-10-02 |
2009-01-10 |
+4.8132 |
-3.658 |
| 2009-01-10 |
2009-02-28 |
+40.2005 |
-6.492 |
| 2009-02-28 |
2011-01-01 |
+3.0849 |
-1.522 |
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) |
| 2026-09-20 00:00 |
02:46:29.27 |
+14:30:17.3 |
HIP 12838 |
26.45 |
| 2026-09-20 12:00 |
02:46:26.90 |
+14:30:05.7 |
HIP 12838 |
25.87 |
| 2026-09-21 00:00 |
02:46:24.51 |
+14:29:54.0 |
HIP 12838 |
25.30 |
| 2026-09-21 12:00 |
02:46:22.10 |
+14:29:42.1 |
HIP 12838 |
24.72 |
| 2026-09-22 00:00 |
02:46:19.67 |
+14:29:30.2 |
HIP 12838 |
24.13 |
| 2026-09-22 12:00 |
02:46:17.21 |
+14:29:18.2 |
HIP 12838 |
23.55 |
| 2026-09-23 00:00 |
02:46:14.74 |
+14:29:06.2 |
HIP 12838 |
22.96 |
| 2026-09-23 12:00 |
02:46:12.25 |
+14:28:54.0 |
HIP 12838 |
22.37 |
| 2026-09-24 00:00 |
02:46:09.74 |
+14:28:41.8 |
HIP 12838 |
21.78 |
| 2026-09-24 12:00 |
02:46:07.21 |
+14:28:29.5 |
HIP 12838 |
21.19 |
| 2026-09-25 00:00 |
02:46:04.66 |
+14:28:17.1 |
HIP 12838 |
20.59 |
| 2026-09-25 12:00 |
02:46:02.09 |
+14:28:04.6 |
HIP 12838 |
20.00 |
| 2026-09-26 00:00 |
02:45:59.51 |
+14:27:52.0 |
HIP 12838 |
19.40 |
| 2026-09-26 12:00 |
02:45:56.90 |
+14:27:39.4 |
HIP 12838 |
18.81 |
| 2026-09-27 00:00 |
02:45:54.28 |
+14:27:26.7 |
HIP 12838 |
18.21 |
| 2026-09-27 12:00 |
02:45:51.63 |
+14:27:13.9 |
HIP 12838 |
17.62 |
| 2026-09-28 00:00 |
02:45:48.97 |
+14:27:01.1 |
HIP 12838 |
17.03 |
| 2026-09-28 12:00 |
02:45:46.30 |
+14:26:48.1 |
HIP 12838 |
16.44 |
| 2026-09-29 00:00 |
02:45:43.60 |
+14:26:35.1 |
HIP 12838 |
15.86 |
| 2026-09-29 12:00 |
02:45:40.89 |
+14:26:22.0 |
HIP 12838 |
15.28 |
| 2026-09-30 00:00 |
02:45:38.16 |
+14:26:08.9 |
HIP 12838 |
14.71 |
| 2026-09-30 12:00 |
02:45:35.41 |
+14:25:55.6 |
HIP 12838 |
14.14 |
| 2026-10-01 00:00 |
02:45:32.65 |
+14:25:42.3 |
HIP 12838 |
13.59 |
| 2026-10-01 12:00 |
02:45:29.86 |
+14:25:29.0 |
HIP 12838 |
13.05 |
| 2026-10-02 00:00 |
02:45:27.07 |
+14:25:15.5 |
HIP 12838 |
12.52 |
| 2026-10-02 12:00 |
02:45:24.25 |
+14:25:02.0 |
HIP 12838 |
12.00 |
| 2026-10-03 00:00 |
02:45:21.42 |
+14:24:48.5 |
HIP 12838 |
11.51 |
| 2026-10-03 12:00 |
02:45:18.57 |
+14:24:34.8 |
HIP 12838 |
11.04 |
| 2026-10-04 00:00 |
02:45:15.71 |
+14:24:21.1 |
HIP 12838 |
10.60 |
| 2026-10-04 12:00 |
02:45:12.83 |
+14:24:07.3 |
HIP 12838 |
10.18 |
| 2026-10-05 00:00 |
02:45:09.94 |
+14:23:53.5 |
HIP 12838 |
9.80 |
| 2026-10-05 12:00 |
02:45:07.03 |
+14:23:39.6 |
HIP 12838 |
9.47 |
| 2026-10-06 00:00 |
02:45:04.11 |
+14:23:25.7 |
HIP 12838 |
9.18 |
| 2026-10-06 12:00 |
02:45:01.17 |
+14:23:11.6 |
HIP 12838 |
8.94 |
| 2026-10-07 00:00 |
02:44:58.21 |
+14:22:57.6 |
HIP 12838 |
8.76 |
| 2026-10-07 12:00 |
02:44:55.24 |
+14:22:43.4 |
HIP 12838 |
8.64 |
| 2026-10-08 00:00 |
02:44:52.26 |
+14:22:29.2 |
HIP 12838 |
8.59 |
| 2026-10-08 12:00 |
02:44:49.26 |
+14:22:15.0 |
HIP 12838 |
8.60 |
| 2026-10-09 00:00 |
02:44:46.25 |
+14:22:00.7 |
HIP 12838 |
8.69 |
| 2026-10-09 12:00 |
02:44:43.23 |
+14:21:46.3 |
HIP 12838 |
8.83 |
| 2026-10-10 00:00 |
02:44:40.19 |
+14:21:31.9 |
HIP 12838 |
9.05 |
| 2026-10-10 12:00 |
02:44:37.14 |
+14:21:17.4 |
HIP 12838 |
9.32 |
| 2026-10-11 00:00 |
02:44:34.08 |
+14:21:02.9 |
HIP 12838 |
9.66 |