メタデータ
| 項目 |
値 |
| Designation |
C/2012 BJ98 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-09-20T10:27:43.799040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:00Z |
| Obs used |
155 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
19.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-04-10.0000000 |
| e |
0.87364959 |
| q (au) |
2.156578 |
| a (au) |
17.068229 |
| i (deg) |
2.636892 |
| Ω (om, deg) |
124.031746 |
| ω (w, deg) |
72.969830 |
| M (ma, deg) |
357.715617 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-09-20 00:00 |
23:58:47.92 |
-02:34:30.9 |
HIP 118286 |
19.42 |
| 2026-09-20 12:00 |
23:58:43.57 |
-02:34:59.4 |
HIP 118286 |
19.66 |
| 2026-09-21 00:00 |
23:58:39.23 |
-02:35:27.8 |
HIP 118286 |
19.98 |
| 2026-09-21 12:00 |
23:58:34.88 |
-02:35:56.3 |
HIP 118286 |
20.36 |
| 2026-09-22 00:00 |
23:58:30.53 |
-02:36:24.7 |
HIP 118286 |
20.80 |
| 2026-09-22 12:00 |
23:58:26.18 |
-02:36:53.0 |
HIP 118073 |
20.45 |
| 2026-09-23 00:00 |
23:58:21.83 |
-02:37:21.4 |
HIP 118073 |
19.37 |
| 2026-09-23 12:00 |
23:58:17.48 |
-02:37:49.7 |
HIP 118073 |
18.30 |
| 2026-09-24 00:00 |
23:58:13.13 |
-02:38:18.0 |
HIP 118073 |
17.25 |
| 2026-09-24 12:00 |
23:58:08.79 |
-02:38:46.2 |
HIP 118073 |
16.22 |
| 2026-09-25 00:00 |
23:58:04.45 |
-02:39:14.4 |
HIP 118073 |
15.21 |
| 2026-09-25 12:00 |
23:58:00.10 |
-02:39:42.5 |
HIP 118073 |
14.22 |
| 2026-09-26 00:00 |
23:57:55.76 |
-02:40:10.6 |
HIP 118073 |
13.27 |
| 2026-09-26 12:00 |
23:57:51.43 |
-02:40:38.7 |
HIP 118073 |
12.36 |
| 2026-09-27 00:00 |
23:57:47.10 |
-02:41:06.7 |
HIP 118073 |
11.50 |
| 2026-09-27 12:00 |
23:57:42.77 |
-02:41:34.6 |
HIP 118073 |
10.70 |
| 2026-09-28 00:00 |
23:57:38.44 |
-02:42:02.5 |
HIP 118073 |
9.98 |
| 2026-09-28 12:00 |
23:57:34.12 |
-02:42:30.4 |
HIP 118073 |
9.34 |
| 2026-09-29 00:00 |
23:57:29.80 |
-02:42:58.1 |
HIP 118073 |
8.82 |
| 2026-09-29 12:00 |
23:57:25.49 |
-02:43:25.8 |
HIP 118073 |
8.44 |
| 2026-09-30 00:00 |
23:57:21.19 |
-02:43:53.5 |
HIP 118073 |
8.20 |
| 2026-09-30 12:00 |
23:57:16.89 |
-02:44:21.1 |
HIP 118073 |
8.12 |
| 2026-10-01 00:00 |
23:57:12.59 |
-02:44:48.6 |
HIP 118073 |
8.21 |
| 2026-10-01 12:00 |
23:57:08.31 |
-02:45:16.0 |
HIP 118073 |
8.47 |
| 2026-10-02 00:00 |
23:57:04.03 |
-02:45:43.4 |
HIP 118073 |
8.86 |
| 2026-10-02 12:00 |
23:56:59.76 |
-02:46:10.7 |
HIP 118073 |
9.39 |
| 2026-10-03 00:00 |
23:56:55.49 |
-02:46:37.9 |
HIP 118073 |
10.02 |
| 2026-10-03 12:00 |
23:56:51.23 |
-02:47:05.0 |
HIP 118073 |
10.73 |
| 2026-10-04 00:00 |
23:56:46.99 |
-02:47:32.1 |
HIP 118073 |
11.52 |
| 2026-10-04 12:00 |
23:56:42.75 |
-02:47:59.0 |
HIP 118073 |
12.36 |
| 2026-10-05 00:00 |
23:56:38.52 |
-02:48:25.9 |
HIP 118073 |
13.24 |
| 2026-10-05 12:00 |
23:56:34.30 |
-02:48:52.7 |
HIP 118073 |
14.16 |
| 2026-10-06 00:00 |
23:56:30.09 |
-02:49:19.4 |
HIP 118073 |
15.11 |
| 2026-10-06 12:00 |
23:56:25.89 |
-02:49:45.9 |
HIP 118073 |
16.08 |
| 2026-10-07 00:00 |
23:56:21.70 |
-02:50:12.4 |
HIP 118073 |
17.07 |
| 2026-10-07 12:00 |
23:56:17.52 |
-02:50:38.8 |
HIP 118073 |
18.07 |
| 2026-10-08 00:00 |
23:56:13.36 |
-02:51:05.1 |
HIP 118073 |
19.08 |
| 2026-10-08 12:00 |
23:56:09.20 |
-02:51:31.3 |
HIP 118073 |
20.11 |
| 2026-10-09 00:00 |
23:56:05.06 |
-02:51:57.3 |
HIP 118073 |
21.14 |
| 2026-10-09 12:00 |
23:56:00.93 |
-02:52:23.3 |
HIP 118073 |
22.17 |
| 2026-10-10 00:00 |
23:55:56.82 |
-02:52:49.1 |
HIP 117875 |
21.33 |
| 2026-10-10 12:00 |
23:55:52.72 |
-02:53:14.8 |
HIP 117875 |
20.23 |
| 2026-10-11 00:00 |
23:55:48.63 |
-02:53:40.4 |
HIP 117875 |
19.13 |