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) |
| 2026-03-26 00:00 |
23:56:53.03 |
-02:33:57.8 |
HIP 118073 |
4.04 |
| 2026-03-26 12:00 |
23:56:57.88 |
-02:33:26.7 |
HIP 118073 |
3.77 |
| 2026-03-27 00:00 |
23:57:02.72 |
-02:32:55.8 |
HIP 118073 |
3.95 |
| 2026-03-27 12:00 |
23:57:07.56 |
-02:32:24.8 |
HIP 118073 |
4.52 |
| 2026-03-28 00:00 |
23:57:12.40 |
-02:31:54.0 |
HIP 118073 |
5.36 |
| 2026-03-28 12:00 |
23:57:17.23 |
-02:31:23.2 |
HIP 118073 |
6.35 |
| 2026-03-29 00:00 |
23:57:22.05 |
-02:30:52.4 |
HIP 118073 |
7.45 |
| 2026-03-29 12:00 |
23:57:26.87 |
-02:30:21.8 |
HIP 118073 |
8.60 |
| 2026-03-30 00:00 |
23:57:31.68 |
-02:29:51.1 |
HIP 118073 |
9.79 |
| 2026-03-30 12:00 |
23:57:36.49 |
-02:29:20.6 |
HIP 118073 |
11.01 |
| 2026-03-31 00:00 |
23:57:41.29 |
-02:28:50.1 |
HIP 118073 |
12.24 |
| 2026-03-31 12:00 |
23:57:46.08 |
-02:28:19.7 |
HIP 118073 |
13.48 |
| 2026-04-01 00:00 |
23:57:50.86 |
-02:27:49.3 |
HIP 118073 |
14.73 |
| 2026-04-01 12:00 |
23:57:55.64 |
-02:27:19.1 |
HIP 118073 |
15.98 |
| 2026-04-02 00:00 |
23:58:00.41 |
-02:26:48.9 |
HIP 118073 |
17.24 |
| 2026-04-02 12:00 |
23:58:05.17 |
-02:26:18.7 |
HIP 118073 |
18.50 |
| 2026-04-03 00:00 |
23:58:09.92 |
-02:25:48.7 |
HIP 118073 |
19.77 |
| 2026-04-03 12:00 |
23:58:14.67 |
-02:25:18.7 |
HIP 118073 |
21.03 |
| 2026-04-04 00:00 |
23:58:19.40 |
-02:24:48.8 |
HIP 118073 |
22.29 |
| 2026-04-04 12:00 |
23:58:24.13 |
-02:24:19.0 |
HIP 118073 |
23.55 |
| 2026-04-05 00:00 |
23:58:28.84 |
-02:23:49.3 |
HIP 118073 |
24.82 |
| 2026-04-05 12:00 |
23:58:33.55 |
-02:23:19.6 |
HIP 118312 |
25.11 |
| 2026-04-06 00:00 |
23:58:38.25 |
-02:22:50.1 |
HIP 118312 |
23.91 |
| 2026-04-06 12:00 |
23:58:42.94 |
-02:22:20.6 |
HIP 118312 |
22.71 |
| 2026-04-07 00:00 |
23:58:47.61 |
-02:21:51.2 |
HIP 118312 |
21.53 |
| 2026-04-07 12:00 |
23:58:52.28 |
-02:21:21.9 |
HIP 118312 |
20.37 |
| 2026-04-08 00:00 |
23:58:56.93 |
-02:20:52.7 |
HIP 118312 |
19.21 |
| 2026-04-08 12:00 |
23:59:01.58 |
-02:20:23.6 |
HIP 118312 |
18.08 |
| 2026-04-09 00:00 |
23:59:06.21 |
-02:19:54.6 |
HIP 118312 |
16.96 |
| 2026-04-09 12:00 |
23:59:10.83 |
-02:19:25.7 |
HIP 118312 |
15.87 |
| 2026-04-10 00:00 |
23:59:15.44 |
-02:18:56.9 |
HIP 118312 |
14.81 |
| 2026-04-10 12:00 |
23:59:20.03 |
-02:18:28.2 |
HIP 118312 |
13.78 |
| 2026-04-11 00:00 |
23:59:24.62 |
-02:17:59.6 |
HIP 118312 |
12.79 |
| 2026-04-11 12:00 |
23:59:29.19 |
-02:17:31.1 |
HIP 118312 |
11.86 |
| 2026-04-12 00:00 |
23:59:33.74 |
-02:17:02.7 |
HIP 118312 |
10.98 |
| 2026-04-12 12:00 |
23:59:38.29 |
-02:16:34.4 |
HIP 118312 |
10.18 |
| 2026-04-13 00:00 |
23:59:42.82 |
-02:16:06.2 |
HIP 118312 |
9.48 |
| 2026-04-13 12:00 |
23:59:47.33 |
-02:15:38.2 |
HIP 118312 |
8.89 |
| 2026-04-14 00:00 |
23:59:51.84 |
-02:15:10.2 |
HIP 118312 |
8.45 |
| 2026-04-14 12:00 |
23:59:56.32 |
-02:14:42.4 |
HIP 118312 |
8.16 |
| 2026-04-15 00:00 |
00:00:00.80 |
-02:14:14.7 |
HIP 118312 |
8.04 |
| 2026-04-15 12:00 |
00:00:05.25 |
-02:13:47.1 |
HIP 118312 |
8.11 |
| 2026-04-16 00:00 |
00:00:09.70 |
-02:13:19.6 |
HIP 118312 |
8.35 |