メタデータ
| 項目 |
値 |
| Designation |
C/2021 T1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-10-14T01:40:49.874880Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:43:17Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
11.500 |
| K1 |
13.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-10-02T04:59:50.640000Z |
| Discovery magnitude (MPC) |
20.04 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) |
2021-12-07.0000000 |
| e |
0.99796291 |
| q (au) |
3.058012 |
| a (au) |
1501.163873 |
| i (deg) |
140.350038 |
| Ω (om, deg) |
56.816270 |
| ω (w, deg) |
51.501528 |
| M (ma, deg) |
0.000914 |
等級
散乱 + 全体線形
$$
M_a = (10.107 + 5.998\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.107 |
| n |
5.998 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.999 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
15:40:56.89 |
-16:10:38.4 |
HIP 76647 |
26.67 |
| 2026-07-29 12:00 |
15:40:52.32 |
-16:10:46.7 |
HIP 76647 |
25.59 |
| 2026-07-30 00:00 |
15:40:47.83 |
-16:10:55.2 |
HIP 76647 |
24.54 |
| 2026-07-30 12:00 |
15:40:43.41 |
-16:11:04.0 |
HIP 76647 |
23.51 |
| 2026-07-31 00:00 |
15:40:39.07 |
-16:11:13.0 |
HIP 76647 |
22.50 |
| 2026-07-31 12:00 |
15:40:34.81 |
-16:11:22.2 |
HIP 76647 |
21.52 |
| 2026-08-01 00:00 |
15:40:30.63 |
-16:11:31.7 |
HIP 76647 |
20.56 |
| 2026-08-01 12:00 |
15:40:26.52 |
-16:11:41.4 |
HIP 76647 |
19.62 |
| 2026-08-02 00:00 |
15:40:22.49 |
-16:11:51.4 |
HIP 76647 |
18.71 |
| 2026-08-02 12:00 |
15:40:18.55 |
-16:12:01.6 |
HIP 76647 |
17.83 |
| 2026-08-03 00:00 |
15:40:14.68 |
-16:12:12.0 |
HIP 76647 |
16.97 |
| 2026-08-03 12:00 |
15:40:10.88 |
-16:12:22.7 |
HIP 76647 |
16.14 |
| 2026-08-04 00:00 |
15:40:07.17 |
-16:12:33.6 |
HIP 76647 |
15.35 |
| 2026-08-04 12:00 |
15:40:03.53 |
-16:12:44.7 |
HIP 76647 |
14.58 |
| 2026-08-05 00:00 |
15:39:59.97 |
-16:12:56.1 |
HIP 76647 |
13.86 |
| 2026-08-05 12:00 |
15:39:56.49 |
-16:13:07.7 |
HIP 76647 |
13.16 |
| 2026-08-06 00:00 |
15:39:53.09 |
-16:13:19.6 |
HIP 76647 |
12.51 |
| 2026-08-06 12:00 |
15:39:49.77 |
-16:13:31.7 |
HIP 76647 |
11.90 |
| 2026-08-07 00:00 |
15:39:46.53 |
-16:13:44.1 |
HIP 76647 |
11.33 |
| 2026-08-07 12:00 |
15:39:43.36 |
-16:13:56.6 |
HIP 76647 |
10.82 |
| 2026-08-08 00:00 |
15:39:40.27 |
-16:14:09.5 |
HIP 76647 |
10.35 |
| 2026-08-08 12:00 |
15:39:37.26 |
-16:14:22.5 |
HIP 76647 |
9.94 |
| 2026-08-09 00:00 |
15:39:34.33 |
-16:14:35.8 |
HIP 76647 |
9.58 |
| 2026-08-09 12:00 |
15:39:31.48 |
-16:14:49.4 |
HIP 76647 |
9.29 |
| 2026-08-10 00:00 |
15:39:28.71 |
-16:15:03.1 |
HIP 76647 |
9.06 |
| 2026-08-10 12:00 |
15:39:26.01 |
-16:15:17.1 |
HIP 76647 |
8.89 |
| 2026-08-11 00:00 |
15:39:23.39 |
-16:15:31.4 |
HIP 76647 |
8.79 |
| 2026-08-11 12:00 |
15:39:20.85 |
-16:15:45.8 |
HIP 76647 |
8.75 |
| 2026-08-12 00:00 |
15:39:18.39 |
-16:16:00.6 |
HIP 76647 |
8.76 |
| 2026-08-12 12:00 |
15:39:16.01 |
-16:16:15.5 |
HIP 76647 |
8.83 |
| 2026-08-13 00:00 |
15:39:13.71 |
-16:16:30.7 |
HIP 76647 |
8.95 |
| 2026-08-13 12:00 |
15:39:11.48 |
-16:16:46.1 |
HIP 76647 |
9.12 |
| 2026-08-14 00:00 |
15:39:09.33 |
-16:17:01.7 |
HIP 76647 |
9.33 |
| 2026-08-14 12:00 |
15:39:07.26 |
-16:17:17.6 |
HIP 76647 |
9.57 |
| 2026-08-15 00:00 |
15:39:05.27 |
-16:17:33.7 |
HIP 76647 |
9.84 |
| 2026-08-15 12:00 |
15:39:03.36 |
-16:17:50.0 |
HIP 76647 |
10.14 |
| 2026-08-16 00:00 |
15:39:01.52 |
-16:18:06.6 |
HIP 76647 |
10.45 |
| 2026-08-16 12:00 |
15:38:59.76 |
-16:18:23.4 |
HIP 76647 |
10.79 |
| 2026-08-17 00:00 |
15:38:58.08 |
-16:18:40.4 |
HIP 76647 |
11.13 |
| 2026-08-17 12:00 |
15:38:56.47 |
-16:18:57.6 |
HIP 76647 |
11.49 |
| 2026-08-18 00:00 |
15:38:54.94 |
-16:19:15.1 |
HIP 76647 |
11.85 |
| 2026-08-18 12:00 |
15:38:53.49 |
-16:19:32.7 |
HIP 76647 |
12.23 |
| 2026-08-19 00:00 |
15:38:52.11 |
-16:19:50.6 |
HIP 76647 |
12.60 |