メタデータ
| 項目 |
値 |
| Designation |
C/1977 D1 (Lovas) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1976-11-01T07:57:55.978560Z |
| Orbit solution date (soln_date, UTC) |
2023-08-28T01:42:37Z |
| Obs used |
30 |
| NEO |
- |
| M1 |
5.000 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1977-05-05.0000000 |
| e |
1.00340358 |
| q (au) |
5.715993 |
| a (au) |
-1679.405282 |
| i (deg) |
64.522285 |
| Ω (om, deg) |
338.172768 |
| ω (w, deg) |
146.312104 |
| M (ma, deg) |
0.002645 |
等級
散乱 + 全体線形
$$
M_a = (13.384 + 2.544\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.384 |
| n |
2.544 |
| gf |
0.999 |
| gb |
-0.900 |
| k |
0.800 |
| 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 |
21:53:52.32 |
-75:30:28.9 |
HIP 107829 |
17.38 |
| 2026-07-29 12:00 |
21:53:46.52 |
-75:30:38.9 |
HIP 107829 |
17.25 |
| 2026-07-30 00:00 |
21:53:40.70 |
-75:30:48.7 |
HIP 107829 |
17.13 |
| 2026-07-30 12:00 |
21:53:34.86 |
-75:30:58.4 |
HIP 107829 |
17.01 |
| 2026-07-31 00:00 |
21:53:29.00 |
-75:31:07.9 |
HIP 107829 |
16.90 |
| 2026-07-31 12:00 |
21:53:23.12 |
-75:31:17.2 |
HIP 107829 |
16.80 |
| 2026-08-01 00:00 |
21:53:17.23 |
-75:31:26.3 |
HIP 107829 |
16.70 |
| 2026-08-01 12:00 |
21:53:11.32 |
-75:31:35.2 |
HIP 107829 |
16.61 |
| 2026-08-02 00:00 |
21:53:05.39 |
-75:31:44.0 |
HIP 107829 |
16.52 |
| 2026-08-02 12:00 |
21:52:59.44 |
-75:31:52.6 |
HIP 107829 |
16.44 |
| 2026-08-03 00:00 |
21:52:53.48 |
-75:32:01.0 |
HIP 107829 |
16.37 |
| 2026-08-03 12:00 |
21:52:47.50 |
-75:32:09.2 |
HIP 107829 |
16.31 |
| 2026-08-04 00:00 |
21:52:41.51 |
-75:32:17.2 |
HIP 107829 |
16.25 |
| 2026-08-04 12:00 |
21:52:35.50 |
-75:32:25.1 |
HIP 107829 |
16.19 |
| 2026-08-05 00:00 |
21:52:29.48 |
-75:32:32.8 |
HIP 107829 |
16.14 |
| 2026-08-05 12:00 |
21:52:23.44 |
-75:32:40.3 |
HIP 107829 |
16.10 |
| 2026-08-06 00:00 |
21:52:17.39 |
-75:32:47.6 |
HIP 107829 |
16.07 |
| 2026-08-06 12:00 |
21:52:11.32 |
-75:32:54.7 |
HIP 107829 |
16.04 |
| 2026-08-07 00:00 |
21:52:05.25 |
-75:33:01.6 |
HIP 107829 |
16.02 |
| 2026-08-07 12:00 |
21:51:59.16 |
-75:33:08.4 |
HIP 107829 |
16.01 |
| 2026-08-08 00:00 |
21:51:53.06 |
-75:33:15.0 |
HIP 107829 |
16.00 |
| 2026-08-08 12:00 |
21:51:46.95 |
-75:33:21.3 |
HIP 107829 |
16.00 |
| 2026-08-09 00:00 |
21:51:40.83 |
-75:33:27.5 |
HIP 107597 |
15.71 |
| 2026-08-09 12:00 |
21:51:34.70 |
-75:33:33.5 |
HIP 107597 |
15.37 |
| 2026-08-10 00:00 |
21:51:28.56 |
-75:33:39.3 |
HIP 107597 |
15.03 |
| 2026-08-10 12:00 |
21:51:22.41 |
-75:33:44.9 |
HIP 107597 |
14.69 |
| 2026-08-11 00:00 |
21:51:16.25 |
-75:33:50.3 |
HIP 107597 |
14.35 |
| 2026-08-11 12:00 |
21:51:10.08 |
-75:33:55.5 |
HIP 107597 |
14.01 |
| 2026-08-12 00:00 |
21:51:03.91 |
-75:34:00.6 |
HIP 107597 |
13.67 |
| 2026-08-12 12:00 |
21:50:57.73 |
-75:34:05.4 |
HIP 107597 |
13.34 |
| 2026-08-13 00:00 |
21:50:51.54 |
-75:34:10.0 |
HIP 107597 |
13.01 |
| 2026-08-13 12:00 |
21:50:45.35 |
-75:34:14.5 |
HIP 107597 |
12.68 |
| 2026-08-14 00:00 |
21:50:39.15 |
-75:34:18.7 |
HIP 107597 |
12.35 |
| 2026-08-14 12:00 |
21:50:32.95 |
-75:34:22.8 |
HIP 107597 |
12.02 |
| 2026-08-15 00:00 |
21:50:26.75 |
-75:34:26.6 |
HIP 107597 |
11.70 |
| 2026-08-15 12:00 |
21:50:20.54 |
-75:34:30.3 |
HIP 107597 |
11.38 |
| 2026-08-16 00:00 |
21:50:14.33 |
-75:34:33.8 |
HIP 107597 |
11.06 |
| 2026-08-16 12:00 |
21:50:08.12 |
-75:34:37.0 |
HIP 107597 |
10.75 |
| 2026-08-17 00:00 |
21:50:01.90 |
-75:34:40.1 |
HIP 107597 |
10.44 |
| 2026-08-17 12:00 |
21:49:55.69 |
-75:34:43.0 |
HIP 107597 |
10.13 |
| 2026-08-18 00:00 |
21:49:49.47 |
-75:34:45.6 |
HIP 107597 |
9.83 |
| 2026-08-18 12:00 |
21:49:43.25 |
-75:34:48.1 |
HIP 107597 |
9.53 |
| 2026-08-19 00:00 |
21:49:37.04 |
-75:34:50.4 |
HIP 107597 |
9.23 |