メタデータ
| 項目 |
値 |
| Designation |
C/2012 B3 (La Sagra) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-12-06T20:01:59.358720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:00Z |
| Obs used |
295 |
| NEO |
- |
| M1 |
13.400 |
| 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) |
2012-04-01.0000000 |
| e |
1.00118336 |
| q (au) |
3.536536 |
| a (au) |
-2988.542542 |
| i (deg) |
106.932915 |
| Ω (om, deg) |
252.999494 |
| ω (w, deg) |
50.733261 |
| M (ma, deg) |
0.000701 |
等級
散乱 + 全体線形
$$
M_a = (16.433 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.433 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
9.991 |
| 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 |
04:36:14.52 |
+11:59:49.7 |
HIP 21475 |
8.27 |
| 2026-05-12 12:00 |
04:36:18.05 |
+11:59:55.5 |
HIP 21475 |
7.67 |
| 2026-05-13 00:00 |
04:36:21.59 |
+12:00:01.2 |
HIP 21475 |
7.13 |
| 2026-05-13 12:00 |
04:36:25.14 |
+12:00:06.9 |
HIP 21475 |
6.65 |
| 2026-05-14 00:00 |
04:36:28.70 |
+12:00:12.5 |
HIP 21475 |
6.26 |
| 2026-05-14 12:00 |
04:36:32.26 |
+12:00:18.0 |
HIP 21475 |
5.97 |
| 2026-05-15 00:00 |
04:36:35.84 |
+12:00:23.5 |
HIP 21475 |
5.80 |
| 2026-05-15 12:00 |
04:36:39.42 |
+12:00:28.9 |
HIP 21475 |
5.75 |
| 2026-05-16 00:00 |
04:36:43.02 |
+12:00:34.3 |
HIP 21475 |
5.84 |
| 2026-05-16 12:00 |
04:36:46.62 |
+12:00:39.6 |
HIP 21475 |
6.06 |
| 2026-05-17 00:00 |
04:36:50.23 |
+12:00:44.8 |
HIP 21475 |
6.39 |
| 2026-05-17 12:00 |
04:36:53.84 |
+12:00:49.9 |
HIP 21475 |
6.83 |
| 2026-05-18 00:00 |
04:36:57.47 |
+12:00:55.0 |
HIP 21475 |
7.34 |
| 2026-05-18 12:00 |
04:37:01.10 |
+12:01:00.0 |
HIP 21475 |
7.93 |
| 2026-05-19 00:00 |
04:37:04.73 |
+12:01:05.0 |
HIP 21475 |
8.56 |
| 2026-05-19 12:00 |
04:37:08.38 |
+12:01:09.9 |
HIP 21475 |
9.24 |
| 2026-05-20 00:00 |
04:37:12.03 |
+12:01:14.7 |
HIP 21475 |
9.95 |
| 2026-05-20 12:00 |
04:37:15.68 |
+12:01:19.4 |
HIP 21475 |
10.70 |
| 2026-05-21 00:00 |
04:37:19.34 |
+12:01:24.0 |
HIP 21475 |
11.46 |
| 2026-05-21 12:00 |
04:37:23.01 |
+12:01:28.6 |
HIP 21475 |
12.24 |
| 2026-05-22 00:00 |
04:37:26.68 |
+12:01:33.1 |
HIP 21475 |
13.04 |
| 2026-05-22 12:00 |
04:37:30.36 |
+12:01:37.6 |
HIP 21475 |
13.85 |
| 2026-05-23 00:00 |
04:37:34.04 |
+12:01:41.9 |
HIP 21475 |
14.68 |
| 2026-05-23 12:00 |
04:37:37.73 |
+12:01:46.2 |
HIP 21475 |
15.51 |
| 2026-05-24 00:00 |
04:37:41.42 |
+12:01:50.4 |
HIP 21475 |
16.35 |
| 2026-05-24 12:00 |
04:37:45.11 |
+12:01:54.5 |
HIP 21475 |
17.19 |
| 2026-05-25 00:00 |
04:37:48.81 |
+12:01:58.6 |
HIP 21650 |
16.59 |
| 2026-05-25 12:00 |
04:37:52.51 |
+12:02:02.5 |
HIP 21650 |
15.70 |
| 2026-05-26 00:00 |
04:37:56.21 |
+12:02:06.4 |
HIP 21650 |
14.81 |
| 2026-05-26 12:00 |
04:37:59.92 |
+12:02:10.2 |
HIP 21650 |
13.93 |
| 2026-05-27 00:00 |
04:38:03.63 |
+12:02:14.0 |
HIP 21650 |
13.05 |
| 2026-05-27 12:00 |
04:38:07.34 |
+12:02:17.6 |
HIP 21650 |
12.17 |
| 2026-05-28 00:00 |
04:38:11.05 |
+12:02:21.2 |
HIP 21650 |
11.29 |
| 2026-05-28 12:00 |
04:38:14.77 |
+12:02:24.7 |
HIP 21650 |
10.42 |
| 2026-05-29 00:00 |
04:38:18.48 |
+12:02:28.1 |
HIP 21650 |
9.56 |
| 2026-05-29 12:00 |
04:38:22.20 |
+12:02:31.4 |
HIP 21650 |
8.71 |
| 2026-05-30 00:00 |
04:38:25.92 |
+12:02:34.7 |
HIP 21650 |
7.86 |
| 2026-05-30 12:00 |
04:38:29.64 |
+12:02:37.8 |
HIP 21650 |
7.04 |
| 2026-05-31 00:00 |
04:38:33.37 |
+12:02:40.9 |
HIP 21650 |
6.24 |
| 2026-05-31 12:00 |
04:38:37.09 |
+12:02:43.9 |
HIP 21650 |
5.47 |
| 2026-06-01 00:00 |
04:38:40.81 |
+12:02:46.8 |
HIP 21650 |
4.75 |
| 2026-06-01 12:00 |
04:38:44.53 |
+12:02:49.7 |
HIP 21650 |
4.11 |
| 2026-06-02 00:00 |
04:38:48.26 |
+12:02:52.4 |
HIP 21650 |
3.59 |