C/2021 T1 (Lemmon)
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 · 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 |
0.999 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.999 |
| 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) |
| 2026-02-03 00:00 |
16:23:26.50 |
-16:48:28.0 |
HIP 80240 |
14.93 |
| 2026-02-03 12:00 |
16:23:28.55 |
-16:48:39.4 |
HIP 80240 |
15.03 |
| 2026-02-04 00:00 |
16:23:30.51 |
-16:48:50.6 |
HIP 80240 |
15.15 |
| 2026-02-04 12:00 |
16:23:32.40 |
-16:49:01.7 |
HIP 80240 |
15.27 |
| 2026-02-05 00:00 |
16:23:34.22 |
-16:49:12.5 |
HIP 80240 |
15.40 |
| 2026-02-05 12:00 |
16:23:35.96 |
-16:49:23.1 |
HIP 80240 |
15.53 |
| 2026-02-06 00:00 |
16:23:37.62 |
-16:49:33.4 |
HIP 80240 |
15.66 |
| 2026-02-06 12:00 |
16:23:39.21 |
-16:49:43.6 |
HIP 80240 |
15.80 |
| 2026-02-07 00:00 |
16:23:40.72 |
-16:49:53.6 |
HIP 80240 |
15.93 |
| 2026-02-07 12:00 |
16:23:42.15 |
-16:50:03.3 |
HIP 80240 |
16.06 |
| 2026-02-08 00:00 |
16:23:43.50 |
-16:50:12.8 |
HIP 80240 |
16.19 |
| 2026-02-08 12:00 |
16:23:44.78 |
-16:50:22.2 |
HIP 80240 |
16.31 |
| 2026-02-09 00:00 |
16:23:45.98 |
-16:50:31.3 |
HIP 80240 |
16.43 |
| 2026-02-09 12:00 |
16:23:47.09 |
-16:50:40.2 |
HIP 80240 |
16.54 |
| 2026-02-10 00:00 |
16:23:48.13 |
-16:50:48.8 |
HIP 80240 |
16.64 |
| 2026-02-10 12:00 |
16:23:49.09 |
-16:50:57.3 |
HIP 80240 |
16.74 |
| 2026-02-11 00:00 |
16:23:49.97 |
-16:51:05.6 |
HIP 80240 |
16.82 |
| 2026-02-11 12:00 |
16:23:50.77 |
-16:51:13.6 |
HIP 80240 |
16.90 |
| 2026-02-12 00:00 |
16:23:51.49 |
-16:51:21.4 |
HIP 80240 |
16.96 |
| 2026-02-12 12:00 |
16:23:52.13 |
-16:51:29.1 |
HIP 80240 |
17.01 |
| 2026-02-13 00:00 |
16:23:52.69 |
-16:51:36.5 |
HIP 80240 |
17.05 |
| 2026-02-13 12:00 |
16:23:53.16 |
-16:51:43.7 |
HIP 80240 |
17.08 |
| 2026-02-14 00:00 |
16:23:53.56 |
-16:51:50.6 |
HIP 80240 |
17.10 |
| 2026-02-14 12:00 |
16:23:53.87 |
-16:51:57.4 |
HIP 80240 |
17.10 |
| 2026-02-15 00:00 |
16:23:54.10 |
-16:52:04.0 |
HIP 80240 |
17.09 |
| 2026-02-15 12:00 |
16:23:54.24 |
-16:52:10.3 |
HIP 80240 |
17.06 |
| 2026-02-16 00:00 |
16:23:54.30 |
-16:52:16.5 |
HIP 80240 |
17.02 |
| 2026-02-16 12:00 |
16:23:54.28 |
-16:52:22.4 |
HIP 80240 |
16.96 |
| 2026-02-17 00:00 |
16:23:54.18 |
-16:52:28.1 |
HIP 80240 |
16.89 |
| 2026-02-17 12:00 |
16:23:53.99 |
-16:52:33.6 |
HIP 80240 |
16.81 |
| 2026-02-18 00:00 |
16:23:53.72 |
-16:52:39.0 |
HIP 80240 |
16.71 |
| 2026-02-18 12:00 |
16:23:53.37 |
-16:52:44.0 |
HIP 80240 |
16.59 |
| 2026-02-19 00:00 |
16:23:52.93 |
-16:52:48.9 |
HIP 80240 |
16.46 |
| 2026-02-19 12:00 |
16:23:52.40 |
-16:52:53.6 |
HIP 80240 |
16.31 |
| 2026-02-20 00:00 |
16:23:51.79 |
-16:52:58.1 |
HIP 80240 |
16.15 |
| 2026-02-20 12:00 |
16:23:51.10 |
-16:53:02.4 |
HIP 80240 |
15.97 |
| 2026-02-21 00:00 |
16:23:50.32 |
-16:53:06.4 |
HIP 80240 |
15.77 |
| 2026-02-21 12:00 |
16:23:49.45 |
-16:53:10.3 |
HIP 80240 |
15.56 |
| 2026-02-22 00:00 |
16:23:48.50 |
-16:53:14.0 |
HIP 80240 |
15.33 |
| 2026-02-22 12:00 |
16:23:47.46 |
-16:53:17.4 |
HIP 80240 |
15.09 |
| 2026-02-23 00:00 |
16:23:46.34 |
-16:53:20.7 |
HIP 80240 |
14.84 |
| 2026-02-23 12:00 |
16:23:45.14 |
-16:53:23.7 |
HIP 80240 |
14.56 |
| 2026-02-24 00:00 |
16:23:43.84 |
-16:53:26.6 |
HIP 80240 |
14.28 |