メタデータ
| 項目 |
値 |
| Designation |
C/2023 H2 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-10-29T04:33:37.779840Z |
| Orbit solution date (soln_date, UTC) |
2024-07-30T14:57:25Z |
| Obs used |
724 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
5.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-04-23T06:42:47.548800Z |
| Discovery magnitude (MPC) |
20.78 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) |
2023-10-07.0000000 |
| e |
0.99628184 |
| q (au) |
0.894405 |
| a (au) |
240.550492 |
| i (deg) |
113.753483 |
| Ω (om, deg) |
217.044806 |
| ω (w, deg) |
150.650349 |
| M (ma, deg) |
359.994138 |
等級
散乱 + 全体線形
$$
M_a = (13.783 + 4.803\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.783 |
| n |
4.803 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.000 |
| 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 |
| 2023-03-26 |
2023-10-28 |
+3.5183 |
-1.258 |
| 2023-10-29 |
2024-02-05 |
-12.4077 |
-0.879 |
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 |
14:54:16.59 |
-82:15:46.3 |
HIP 72081 |
23.08 |
| 2026-06-01 12:00 |
14:52:53.84 |
-82:13:42.5 |
HIP 72081 |
19.63 |
| 2026-06-02 00:00 |
14:51:32.19 |
-82:11:36.6 |
HIP 72081 |
16.18 |
| 2026-06-02 12:00 |
14:50:11.65 |
-82:09:28.6 |
HIP 72081 |
12.75 |
| 2026-06-03 00:00 |
14:48:52.22 |
-82:07:18.5 |
HIP 72081 |
9.37 |
| 2026-06-03 12:00 |
14:47:33.91 |
-82:05:06.4 |
HIP 72081 |
6.09 |
| 2026-06-04 00:00 |
14:46:16.73 |
-82:02:52.2 |
HIP 72081 |
3.26 |
| 2026-06-04 12:00 |
14:45:00.67 |
-82:00:36.1 |
HIP 72081 |
2.92 |
| 2026-06-05 00:00 |
14:43:45.74 |
-81:58:18.1 |
HIP 72081 |
5.54 |
| 2026-06-05 12:00 |
14:42:31.94 |
-81:55:58.1 |
HIP 72081 |
8.79 |
| 2026-06-06 00:00 |
14:41:19.27 |
-81:53:36.3 |
HIP 72081 |
12.17 |
| 2026-06-06 12:00 |
14:40:07.74 |
-81:51:12.7 |
HIP 72081 |
15.60 |
| 2026-06-07 00:00 |
14:38:57.35 |
-81:48:47.2 |
HIP 72081 |
19.06 |
| 2026-06-07 12:00 |
14:37:48.08 |
-81:46:20.1 |
HIP 71883 |
20.91 |
| 2026-06-08 00:00 |
14:36:39.95 |
-81:43:51.1 |
HIP 71883 |
20.13 |
| 2026-06-08 12:00 |
14:35:32.95 |
-81:41:20.6 |
HIP 71883 |
19.91 |
| 2026-06-09 00:00 |
14:34:27.08 |
-81:38:48.3 |
HIP 71883 |
20.28 |
| 2026-06-09 12:00 |
14:33:22.33 |
-81:36:14.5 |
HIP 70610 |
17.51 |
| 2026-06-10 00:00 |
14:32:18.71 |
-81:33:39.1 |
HIP 70610 |
14.22 |
| 2026-06-10 12:00 |
14:31:16.20 |
-81:31:02.1 |
HIP 70610 |
11.08 |
| 2026-06-11 00:00 |
14:30:14.81 |
-81:28:23.7 |
HIP 70610 |
8.22 |
| 2026-06-11 12:00 |
14:29:14.53 |
-81:25:43.7 |
HIP 70610 |
6.08 |
| 2026-06-12 00:00 |
14:28:15.35 |
-81:23:02.4 |
HIP 70610 |
5.55 |
| 2026-06-12 12:00 |
14:27:17.28 |
-81:20:19.6 |
HIP 70610 |
7.01 |
| 2026-06-13 00:00 |
14:26:20.30 |
-81:17:35.5 |
HIP 70610 |
9.59 |
| 2026-06-13 12:00 |
14:25:24.41 |
-81:14:50.1 |
HIP 70610 |
12.62 |
| 2026-06-14 00:00 |
14:24:29.60 |
-81:12:03.3 |
HIP 70610 |
15.84 |
| 2026-06-14 12:00 |
14:23:35.86 |
-81:09:15.3 |
HIP 69896 |
15.27 |
| 2026-06-15 00:00 |
14:22:43.19 |
-81:06:26.1 |
HIP 69896 |
12.05 |
| 2026-06-15 12:00 |
14:21:51.59 |
-81:03:35.7 |
HIP 69896 |
9.04 |
| 2026-06-16 00:00 |
14:21:01.03 |
-81:00:44.2 |
HIP 69896 |
6.53 |
| 2026-06-16 12:00 |
14:20:11.52 |
-80:57:51.5 |
HIP 69896 |
5.29 |
| 2026-06-17 00:00 |
14:19:23.05 |
-80:54:57.7 |
HIP 69896 |
6.13 |
| 2026-06-17 12:00 |
14:18:35.60 |
-80:52:02.9 |
HIP 69896 |
8.45 |
| 2026-06-18 00:00 |
14:17:49.17 |
-80:49:07.1 |
HIP 69896 |
11.38 |
| 2026-06-18 12:00 |
14:17:03.76 |
-80:46:10.3 |
HIP 69896 |
14.55 |
| 2026-06-19 00:00 |
14:16:19.34 |
-80:43:12.6 |
HIP 69896 |
17.84 |
| 2026-06-19 12:00 |
14:15:35.91 |
-80:40:13.9 |
HIP 69055 |
19.05 |
| 2026-06-20 00:00 |
14:14:53.46 |
-80:37:14.3 |
HIP 69055 |
18.64 |
| 2026-06-20 12:00 |
14:14:11.98 |
-80:34:13.9 |
HIP 69055 |
18.89 |
| 2026-06-21 00:00 |
14:13:31.47 |
-80:31:12.7 |
HIP 69055 |
19.77 |
| 2026-06-21 12:00 |
14:12:51.90 |
-80:28:10.7 |
HIP 69055 |
21.20 |
| 2026-06-22 00:00 |
14:12:13.27 |
-80:25:07.9 |
HIP 69055 |
23.07 |