C/2018 R3 (Lemmon)
メタデータ
| 項目 |
値 |
| Designation |
C/2018 R3 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-06-07T04:45:17.421120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:46Z |
| Obs used |
272 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
11.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-09-07T03:53:59.136000Z |
| Discovery magnitude (MPC) |
19.20 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-02-24.0000000 |
| e |
0.99934491 |
| q (au) |
1.290602 |
| a (au) |
1970.100092 |
| i (deg) |
69.715410 |
| Ω (om, deg) |
324.626026 |
| ω (w, deg) |
112.875459 |
| M (ma, deg) |
359.998837 |
等級
散乱 + 全体線形
$$
M_a = (9.265 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.265 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.875 |
| k |
0.998 |
| 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 |
| 2018-08-08 |
2019-06-07 |
-0.2234 |
+0.114 |
| 2019-06-07 |
2020-03-03 |
+8.0397 |
-3.207 |
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) |
| 2026-02-03 00:00 |
10:05:20.76 |
-72:01:39.4 |
HIP 49403 |
2.98 |
| 2026-02-03 12:00 |
10:05:01.99 |
-72:02:08.3 |
HIP 49403 |
2.36 |
| 2026-02-04 00:00 |
10:04:43.15 |
-72:02:36.3 |
HIP 49403 |
2.65 |
| 2026-02-04 12:00 |
10:04:24.26 |
-72:03:03.4 |
HIP 49403 |
3.63 |
| 2026-02-05 00:00 |
10:04:05.32 |
-72:03:29.6 |
HIP 49403 |
4.90 |
| 2026-02-05 12:00 |
10:03:46.32 |
-72:03:54.8 |
HIP 49403 |
6.29 |
| 2026-02-06 00:00 |
10:03:27.26 |
-72:04:19.1 |
HIP 49403 |
7.73 |
| 2026-02-06 12:00 |
10:03:08.16 |
-72:04:42.4 |
HIP 49403 |
9.20 |
| 2026-02-07 00:00 |
10:02:49.01 |
-72:05:04.8 |
HIP 49403 |
10.69 |
| 2026-02-07 12:00 |
10:02:29.81 |
-72:05:26.3 |
HIP 49403 |
12.18 |
| 2026-02-08 00:00 |
10:02:10.57 |
-72:05:46.8 |
HIP 49403 |
13.69 |
| 2026-02-08 12:00 |
10:01:51.29 |
-72:06:06.3 |
HIP 49086 |
13.47 |
| 2026-02-09 00:00 |
10:01:31.96 |
-72:06:25.0 |
HIP 49086 |
12.86 |
| 2026-02-09 12:00 |
10:01:12.61 |
-72:06:42.6 |
HIP 49086 |
12.42 |
| 2026-02-10 00:00 |
10:00:53.21 |
-72:06:59.3 |
HIP 49086 |
12.17 |
| 2026-02-10 12:00 |
10:00:33.79 |
-72:07:15.1 |
HIP 48882 |
11.42 |
| 2026-02-11 00:00 |
10:00:14.33 |
-72:07:29.9 |
HIP 48882 |
10.08 |
| 2026-02-11 12:00 |
09:59:54.85 |
-72:07:43.8 |
HIP 48882 |
8.80 |
| 2026-02-12 00:00 |
09:59:35.34 |
-72:07:56.7 |
HIP 48882 |
7.59 |
| 2026-02-12 12:00 |
09:59:15.81 |
-72:08:08.6 |
HIP 48882 |
6.50 |
| 2026-02-13 00:00 |
09:58:56.25 |
-72:08:19.6 |
HIP 48882 |
5.60 |
| 2026-02-13 12:00 |
09:58:36.68 |
-72:08:29.6 |
HIP 48882 |
4.99 |
| 2026-02-14 00:00 |
09:58:17.10 |
-72:08:38.6 |
HIP 48882 |
4.78 |
| 2026-02-14 12:00 |
09:57:57.50 |
-72:08:46.7 |
HIP 48882 |
5.02 |
| 2026-02-15 00:00 |
09:57:37.89 |
-72:08:53.9 |
HIP 48882 |
5.65 |
| 2026-02-15 12:00 |
09:57:18.27 |
-72:09:00.0 |
HIP 48882 |
6.57 |
| 2026-02-16 00:00 |
09:56:58.64 |
-72:09:05.3 |
HIP 48882 |
7.66 |
| 2026-02-16 12:00 |
09:56:39.01 |
-72:09:09.5 |
HIP 48882 |
8.87 |
| 2026-02-17 00:00 |
09:56:19.38 |
-72:09:12.8 |
HIP 48882 |
10.15 |
| 2026-02-17 12:00 |
09:55:59.75 |
-72:09:15.1 |
HIP 48882 |
11.48 |
| 2026-02-18 00:00 |
09:55:40.12 |
-72:09:16.5 |
HIP 48882 |
12.84 |
| 2026-02-18 12:00 |
09:55:20.50 |
-72:09:16.9 |
HIP 48882 |
14.23 |
| 2026-02-19 00:00 |
09:55:00.89 |
-72:09:16.3 |
HIP 48882 |
15.63 |
| 2026-02-19 12:00 |
09:54:41.29 |
-72:09:14.8 |
HIP 48430 |
16.37 |
| 2026-02-20 00:00 |
09:54:21.70 |
-72:09:12.3 |
HIP 48430 |
15.42 |
| 2026-02-20 12:00 |
09:54:02.13 |
-72:09:08.9 |
HIP 48430 |
14.56 |
| 2026-02-21 00:00 |
09:53:42.57 |
-72:09:04.5 |
HIP 48430 |
13.79 |
| 2026-02-21 12:00 |
09:53:23.04 |
-72:08:59.2 |
HIP 48430 |
13.13 |
| 2026-02-22 00:00 |
09:53:03.53 |
-72:08:52.9 |
HIP 48430 |
12.61 |
| 2026-02-22 12:00 |
09:52:44.04 |
-72:08:45.7 |
HIP 48430 |
12.23 |
| 2026-02-23 00:00 |
09:52:24.59 |
-72:08:37.5 |
HIP 48430 |
12.02 |
| 2026-02-23 12:00 |
09:52:05.16 |
-72:08:28.4 |
HIP 48430 |
11.98 |
| 2026-02-24 00:00 |
09:51:45.77 |
-72:08:18.3 |
HIP 48430 |
12.11 |