メタデータ
| 項目 |
値 |
| Designation |
C/2018 B1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-03-30T10:39:55.339200Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
316 |
| NEO |
- |
| M1 |
12.300 |
| 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) |
2018-10-22.0000000 |
| e |
1.00296934 |
| q (au) |
5.116718 |
| a (au) |
-1723.183540 |
| i (deg) |
162.423569 |
| Ω (om, deg) |
133.168875 |
| ω (w, deg) |
68.349093 |
| M (ma, deg) |
0.002832 |
等級
散乱 + 全体線形
$$
M_a = (15.479 + 2.127\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.479 |
| n |
2.127 |
| gf |
1.000 |
| gb |
-0.810 |
| 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 |
| 2017-01-16 |
2018-03-03 |
+44.9933 |
-31.597 |
| 2018-08-17 |
2019-10-31 |
+3.0484 |
-2.392 |
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 |
20:28:59.11 |
-21:12:51.8 |
HIP 101098 |
10.26 |
| 2026-09-20 12:00 |
20:28:54.34 |
-21:13:10.2 |
HIP 101098 |
11.38 |
| 2026-09-21 00:00 |
20:28:49.61 |
-21:13:28.4 |
HIP 101098 |
12.49 |
| 2026-09-21 12:00 |
20:28:44.92 |
-21:13:46.5 |
HIP 101098 |
13.60 |
| 2026-09-22 00:00 |
20:28:40.29 |
-21:14:04.3 |
HIP 101098 |
14.70 |
| 2026-09-22 12:00 |
20:28:35.71 |
-21:14:21.9 |
HIP 101098 |
15.79 |
| 2026-09-23 00:00 |
20:28:31.18 |
-21:14:39.4 |
HIP 101098 |
16.87 |
| 2026-09-23 12:00 |
20:28:26.69 |
-21:14:56.6 |
HIP 101098 |
17.94 |
| 2026-09-24 00:00 |
20:28:22.26 |
-21:15:13.7 |
HIP 101098 |
19.00 |
| 2026-09-24 12:00 |
20:28:17.88 |
-21:15:30.5 |
HIP 101098 |
20.05 |
| 2026-09-25 00:00 |
20:28:13.54 |
-21:15:47.1 |
HIP 101098 |
21.08 |
| 2026-09-25 12:00 |
20:28:09.26 |
-21:16:03.6 |
HIP 101098 |
22.11 |
| 2026-09-26 00:00 |
20:28:05.03 |
-21:16:19.8 |
HIP 101098 |
23.12 |
| 2026-09-26 12:00 |
20:28:00.84 |
-21:16:35.9 |
HIP 101098 |
24.13 |
| 2026-09-27 00:00 |
20:27:56.71 |
-21:16:51.7 |
HIP 101098 |
25.12 |
| 2026-09-27 12:00 |
20:27:52.63 |
-21:17:07.4 |
HIP 101098 |
26.10 |
| 2026-09-28 00:00 |
20:27:48.61 |
-21:17:22.8 |
HIP 101098 |
27.07 |
| 2026-09-28 12:00 |
20:27:44.63 |
-21:17:38.0 |
HIP 101098 |
28.02 |
| 2026-09-29 00:00 |
20:27:40.71 |
-21:17:53.1 |
HIP 101098 |
28.97 |
| 2026-09-29 12:00 |
20:27:36.83 |
-21:18:07.9 |
HIP 101098 |
29.90 |
| 2026-09-30 00:00 |
20:27:33.01 |
-21:18:22.6 |
HIP 100740 |
30.53 |
| 2026-09-30 12:00 |
20:27:29.24 |
-21:18:37.0 |
HIP 100740 |
29.76 |
| 2026-10-01 00:00 |
20:27:25.53 |
-21:18:51.2 |
HIP 100740 |
29.01 |
| 2026-10-01 12:00 |
20:27:21.87 |
-21:19:05.3 |
HIP 100740 |
28.29 |
| 2026-10-02 00:00 |
20:27:18.26 |
-21:19:19.1 |
HIP 100740 |
27.58 |
| 2026-10-02 12:00 |
20:27:14.70 |
-21:19:32.7 |
HIP 100740 |
26.89 |
| 2026-10-03 00:00 |
20:27:11.20 |
-21:19:46.2 |
HIP 100740 |
26.22 |
| 2026-10-03 12:00 |
20:27:07.75 |
-21:19:59.4 |
HIP 100740 |
25.58 |
| 2026-10-04 00:00 |
20:27:04.35 |
-21:20:12.4 |
HIP 100740 |
24.95 |
| 2026-10-04 12:00 |
20:27:01.01 |
-21:20:25.2 |
HIP 100740 |
24.34 |
| 2026-10-05 00:00 |
20:26:57.72 |
-21:20:37.8 |
HIP 100740 |
23.76 |
| 2026-10-05 12:00 |
20:26:54.48 |
-21:20:50.2 |
HIP 100740 |
23.20 |
| 2026-10-06 00:00 |
20:26:51.30 |
-21:21:02.5 |
HIP 100740 |
22.66 |
| 2026-10-06 12:00 |
20:26:48.18 |
-21:21:14.5 |
HIP 100740 |
22.14 |
| 2026-10-07 00:00 |
20:26:45.11 |
-21:21:26.3 |
HIP 100740 |
21.65 |
| 2026-10-07 12:00 |
20:26:42.09 |
-21:21:37.9 |
HIP 100740 |
21.18 |
| 2026-10-08 00:00 |
20:26:39.13 |
-21:21:49.3 |
HIP 100740 |
20.73 |
| 2026-10-08 12:00 |
20:26:36.23 |
-21:22:00.4 |
HIP 100740 |
20.31 |
| 2026-10-09 00:00 |
20:26:33.38 |
-21:22:11.4 |
HIP 100740 |
19.91 |
| 2026-10-09 12:00 |
20:26:30.58 |
-21:22:22.2 |
HIP 100740 |
19.53 |
| 2026-10-10 00:00 |
20:26:27.85 |
-21:22:32.8 |
HIP 100740 |
19.18 |
| 2026-10-10 12:00 |
20:26:25.16 |
-21:22:43.2 |
HIP 100740 |
18.85 |
| 2026-10-11 00:00 |
20:26:22.53 |
-21:22:53.3 |
HIP 100740 |
18.54 |