メタデータ
| 項目 |
値 |
| Designation |
C/2023 TD22 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-09-16T06:56:29.990400Z |
| Orbit solution date (soln_date, UTC) |
2025-10-28T16:12:33Z |
| Obs used |
594 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
9.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-08-07.0000000 |
| e |
0.95098622 |
| q (au) |
2.356803 |
| a (au) |
48.084497 |
| i (deg) |
170.489633 |
| Ω (om, deg) |
5.555928 |
| ω (w, deg) |
32.533029 |
| M (ma, deg) |
359.880907 |
等級
散乱 + 全体線形
$$
M_a = (13.564 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.564 |
| n |
2.000 |
| gf |
0.993 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
3.095 |
| 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) |
| 2026-03-26 00:00 |
15:48:50.21 |
-12:19:26.8 |
HIP 77337 |
22.86 |
| 2026-03-26 12:00 |
15:48:27.23 |
-12:17:49.8 |
HIP 77337 |
17.02 |
| 2026-03-27 00:00 |
15:48:04.05 |
-12:16:12.2 |
HIP 77337 |
11.13 |
| 2026-03-27 12:00 |
15:47:40.70 |
-12:14:34.2 |
HIP 77337 |
5.19 |
| 2026-03-28 00:00 |
15:47:17.16 |
-12:12:55.6 |
HIP 77337 |
0.80 |
| 2026-03-28 12:00 |
15:46:53.44 |
-12:11:16.5 |
HIP 77337 |
6.82 |
| 2026-03-29 00:00 |
15:46:29.55 |
-12:09:36.9 |
HIP 77337 |
12.89 |
| 2026-03-29 12:00 |
15:46:05.47 |
-12:07:56.8 |
HIP 77337 |
19.00 |
| 2026-03-30 00:00 |
15:45:41.23 |
-12:06:16.2 |
HIP 77071 |
22.49 |
| 2026-03-30 12:00 |
15:45:16.80 |
-12:04:35.1 |
HIP 77071 |
16.33 |
| 2026-03-31 00:00 |
15:44:52.21 |
-12:02:53.6 |
HIP 77071 |
10.20 |
| 2026-03-31 12:00 |
15:44:27.44 |
-12:01:11.6 |
HIP 77071 |
4.37 |
| 2026-04-01 00:00 |
15:44:02.51 |
-11:59:29.1 |
HIP 77071 |
3.67 |
| 2026-04-01 12:00 |
15:43:37.41 |
-11:57:46.1 |
HIP 77071 |
9.43 |
| 2026-04-02 00:00 |
15:43:12.14 |
-11:56:02.7 |
HIP 77071 |
15.71 |
| 2026-04-02 12:00 |
15:42:46.71 |
-11:54:18.8 |
HIP 77071 |
22.11 |
| 2026-04-03 00:00 |
15:42:21.12 |
-11:52:34.5 |
HIP 76828 |
17.39 |
| 2026-04-03 12:00 |
15:41:55.37 |
-11:50:49.8 |
HIP 76828 |
11.16 |
| 2026-04-04 00:00 |
15:41:29.47 |
-11:49:04.6 |
HIP 76828 |
5.65 |
| 2026-04-04 12:00 |
15:41:03.40 |
-11:47:19.1 |
HIP 76828 |
5.09 |
| 2026-04-05 00:00 |
15:40:37.19 |
-11:45:33.1 |
HIP 76828 |
10.40 |
| 2026-04-05 12:00 |
15:40:10.82 |
-11:43:46.7 |
HIP 76828 |
16.73 |
| 2026-04-06 00:00 |
15:39:44.30 |
-11:41:59.9 |
HIP 76828 |
23.31 |
| 2026-04-06 12:00 |
15:39:17.64 |
-11:40:12.7 |
HIP 76828 |
29.99 |
| 2026-04-07 00:00 |
15:38:50.83 |
-11:38:25.1 |
HIP 76436 |
34.09 |
| 2026-04-07 12:00 |
15:38:23.88 |
-11:36:37.2 |
HIP 76436 |
27.30 |
| 2026-04-08 00:00 |
15:37:56.78 |
-11:34:48.9 |
HIP 76436 |
20.50 |
| 2026-04-08 12:00 |
15:37:29.55 |
-11:33:00.2 |
HIP 76436 |
13.74 |
| 2026-04-09 00:00 |
15:37:02.18 |
-11:31:11.2 |
HIP 76436 |
7.26 |
| 2026-04-09 12:00 |
15:36:34.68 |
-11:29:21.9 |
HIP 76436 |
3.62 |
| 2026-04-10 00:00 |
15:36:07.05 |
-11:27:32.2 |
HIP 76436 |
8.45 |
| 2026-04-10 12:00 |
15:35:39.29 |
-11:25:42.2 |
HIP 76436 |
15.14 |
| 2026-04-11 00:00 |
15:35:11.40 |
-11:23:51.9 |
HIP 76322 |
17.30 |
| 2026-04-11 12:00 |
15:34:43.39 |
-11:22:01.3 |
HIP 76322 |
21.24 |
| 2026-04-12 00:00 |
15:34:15.25 |
-11:20:10.4 |
HIP 76322 |
26.55 |
| 2026-04-12 12:00 |
15:33:47.00 |
-11:18:19.2 |
HIP 76020 |
31.81 |
| 2026-04-13 00:00 |
15:33:18.63 |
-11:16:27.8 |
HIP 76020 |
24.71 |
| 2026-04-13 12:00 |
15:32:50.14 |
-11:14:36.1 |
HIP 76020 |
17.65 |
| 2026-04-14 00:00 |
15:32:21.55 |
-11:12:44.2 |
HIP 76020 |
10.81 |
| 2026-04-14 12:00 |
15:31:52.84 |
-11:10:52.0 |
HIP 76020 |
5.21 |
| 2026-04-15 00:00 |
15:31:24.03 |
-11:08:59.6 |
HIP 76020 |
6.61 |
| 2026-04-15 12:00 |
15:30:55.12 |
-11:07:06.9 |
HIP 76020 |
12.95 |
| 2026-04-16 00:00 |
15:30:26.11 |
-11:05:14.1 |
HIP 76020 |
20.01 |