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 · University of Arizona 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) |
| 2026-06-01 00:00 |
09:26:27.24 |
-68:36:05.1 |
HIP 46205 |
15.78 |
| 2026-06-01 12:00 |
09:26:33.01 |
-68:34:49.1 |
HIP 46205 |
14.89 |
| 2026-06-02 00:00 |
09:26:38.89 |
-68:33:33.4 |
HIP 46205 |
14.08 |
| 2026-06-02 12:00 |
09:26:44.88 |
-68:32:18.1 |
HIP 46205 |
13.37 |
| 2026-06-03 00:00 |
09:26:50.98 |
-68:31:03.1 |
HIP 46205 |
12.79 |
| 2026-06-03 12:00 |
09:26:57.18 |
-68:29:48.5 |
HIP 46205 |
12.34 |
| 2026-06-04 00:00 |
09:27:03.50 |
-68:28:34.2 |
HIP 46205 |
12.04 |
| 2026-06-04 12:00 |
09:27:09.93 |
-68:27:20.2 |
HIP 46205 |
11.91 |
| 2026-06-05 00:00 |
09:27:16.46 |
-68:26:06.6 |
HIP 46205 |
11.95 |
| 2026-06-05 12:00 |
09:27:23.10 |
-68:24:53.4 |
HIP 46205 |
12.15 |
| 2026-06-06 00:00 |
09:27:29.84 |
-68:23:40.5 |
HIP 46205 |
12.51 |
| 2026-06-06 12:00 |
09:27:36.69 |
-68:22:28.1 |
HIP 46205 |
13.02 |
| 2026-06-07 00:00 |
09:27:43.65 |
-68:21:15.9 |
HIP 46205 |
13.65 |
| 2026-06-07 12:00 |
09:27:50.71 |
-68:20:04.2 |
HIP 46205 |
14.40 |
| 2026-06-08 00:00 |
09:27:57.87 |
-68:18:52.9 |
HIP 46205 |
15.24 |
| 2026-06-08 12:00 |
09:28:05.13 |
-68:17:41.9 |
HIP 46205 |
16.16 |
| 2026-06-09 00:00 |
09:28:12.50 |
-68:16:31.3 |
HIP 46423 |
15.70 |
| 2026-06-09 12:00 |
09:28:19.96 |
-68:15:21.2 |
HIP 46423 |
14.62 |
| 2026-06-10 00:00 |
09:28:27.53 |
-68:14:11.4 |
HIP 46423 |
13.60 |
| 2026-06-10 12:00 |
09:28:35.20 |
-68:13:02.1 |
HIP 46423 |
12.64 |
| 2026-06-11 00:00 |
09:28:42.96 |
-68:11:53.1 |
HIP 46423 |
11.78 |
| 2026-06-11 12:00 |
09:28:50.82 |
-68:10:44.6 |
HIP 46423 |
11.03 |
| 2026-06-12 00:00 |
09:28:58.78 |
-68:09:36.5 |
HIP 46423 |
10.41 |
| 2026-06-12 12:00 |
09:29:06.84 |
-68:08:28.9 |
HIP 46423 |
9.96 |
| 2026-06-13 00:00 |
09:29:14.99 |
-68:07:21.6 |
HIP 46423 |
9.68 |
| 2026-06-13 12:00 |
09:29:23.24 |
-68:06:14.8 |
HIP 46423 |
9.61 |
| 2026-06-14 00:00 |
09:29:31.58 |
-68:05:08.5 |
HIP 46667 |
9.66 |
| 2026-06-14 12:00 |
09:29:40.01 |
-68:04:02.6 |
HIP 46667 |
9.79 |
| 2026-06-15 00:00 |
09:29:48.54 |
-68:02:57.2 |
HIP 46667 |
10.09 |
| 2026-06-15 12:00 |
09:29:57.16 |
-68:01:52.2 |
HIP 46667 |
10.55 |
| 2026-06-16 00:00 |
09:30:05.87 |
-68:00:47.6 |
HIP 46667 |
11.14 |
| 2026-06-16 12:00 |
09:30:14.67 |
-67:59:43.6 |
HIP 46667 |
11.84 |
| 2026-06-17 00:00 |
09:30:23.56 |
-67:58:40.0 |
HIP 46667 |
12.64 |
| 2026-06-17 12:00 |
09:30:32.53 |
-67:57:36.9 |
HIP 46667 |
13.52 |
| 2026-06-18 00:00 |
09:30:41.60 |
-67:56:34.2 |
HIP 46667 |
14.45 |
| 2026-06-18 12:00 |
09:30:50.75 |
-67:55:32.1 |
HIP 46667 |
15.45 |
| 2026-06-19 00:00 |
09:30:59.98 |
-67:54:30.4 |
HIP 46667 |
16.48 |
| 2026-06-19 12:00 |
09:31:09.30 |
-67:53:29.2 |
HIP 46667 |
17.55 |
| 2026-06-20 00:00 |
09:31:18.71 |
-67:52:28.5 |
HIP 46851 |
16.45 |
| 2026-06-20 12:00 |
09:31:28.20 |
-67:51:28.3 |
HIP 46851 |
15.13 |
| 2026-06-21 00:00 |
09:31:37.77 |
-67:50:28.6 |
HIP 46851 |
13.81 |
| 2026-06-21 12:00 |
09:31:47.42 |
-67:49:29.4 |
HIP 46851 |
12.50 |
| 2026-06-22 00:00 |
09:31:57.15 |
-67:48:30.8 |
HIP 46851 |
11.21 |