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) |
| 2026-09-20 00:00 |
21:43:23.35 |
-75:30:23.3 |
HIP 107309 |
2.93 |
| 2026-09-20 12:00 |
21:43:18.25 |
-75:30:12.9 |
HIP 107309 |
3.13 |
| 2026-09-21 00:00 |
21:43:13.18 |
-75:30:02.2 |
HIP 107309 |
3.35 |
| 2026-09-21 12:00 |
21:43:08.14 |
-75:29:51.4 |
HIP 107309 |
3.59 |
| 2026-09-22 00:00 |
21:43:03.13 |
-75:29:40.5 |
HIP 107309 |
3.85 |
| 2026-09-22 12:00 |
21:42:58.16 |
-75:29:29.3 |
HIP 107309 |
4.13 |
| 2026-09-23 00:00 |
21:42:53.22 |
-75:29:18.0 |
HIP 107309 |
4.41 |
| 2026-09-23 12:00 |
21:42:48.32 |
-75:29:06.5 |
HIP 107309 |
4.71 |
| 2026-09-24 00:00 |
21:42:43.46 |
-75:28:54.8 |
HIP 107309 |
5.00 |
| 2026-09-24 12:00 |
21:42:38.62 |
-75:28:42.9 |
HIP 107309 |
5.31 |
| 2026-09-25 00:00 |
21:42:33.83 |
-75:28:30.9 |
HIP 107309 |
5.62 |
| 2026-09-25 12:00 |
21:42:29.07 |
-75:28:18.7 |
HIP 107309 |
5.93 |
| 2026-09-26 00:00 |
21:42:24.35 |
-75:28:06.4 |
HIP 107309 |
6.25 |
| 2026-09-26 12:00 |
21:42:19.66 |
-75:27:53.8 |
HIP 107309 |
6.57 |
| 2026-09-27 00:00 |
21:42:15.01 |
-75:27:41.1 |
HIP 107309 |
6.89 |
| 2026-09-27 12:00 |
21:42:10.40 |
-75:27:28.2 |
HIP 107309 |
7.22 |
| 2026-09-28 00:00 |
21:42:05.83 |
-75:27:15.2 |
HIP 107309 |
7.54 |
| 2026-09-28 12:00 |
21:42:01.30 |
-75:27:02.0 |
HIP 107309 |
7.87 |
| 2026-09-29 00:00 |
21:41:56.80 |
-75:26:48.6 |
HIP 107309 |
8.20 |
| 2026-09-29 12:00 |
21:41:52.35 |
-75:26:35.0 |
HIP 107309 |
8.53 |
| 2026-09-30 00:00 |
21:41:47.93 |
-75:26:21.3 |
HIP 107309 |
8.86 |
| 2026-09-30 12:00 |
21:41:43.55 |
-75:26:07.5 |
HIP 107309 |
9.19 |
| 2026-10-01 00:00 |
21:41:39.21 |
-75:25:53.4 |
HIP 107309 |
9.52 |
| 2026-10-01 12:00 |
21:41:34.92 |
-75:25:39.2 |
HIP 107309 |
9.86 |
| 2026-10-02 00:00 |
21:41:30.66 |
-75:25:24.9 |
HIP 107309 |
10.19 |
| 2026-10-02 12:00 |
21:41:26.45 |
-75:25:10.4 |
HIP 107309 |
10.52 |
| 2026-10-03 00:00 |
21:41:22.27 |
-75:24:55.7 |
HIP 107309 |
10.86 |
| 2026-10-03 12:00 |
21:41:18.14 |
-75:24:40.9 |
HIP 107309 |
11.19 |
| 2026-10-04 00:00 |
21:41:14.05 |
-75:24:25.9 |
HIP 107309 |
11.52 |
| 2026-10-04 12:00 |
21:41:10.00 |
-75:24:10.8 |
HIP 107309 |
11.86 |
| 2026-10-05 00:00 |
21:41:06.00 |
-75:23:55.5 |
HIP 107309 |
12.19 |
| 2026-10-05 12:00 |
21:41:02.04 |
-75:23:40.0 |
HIP 107309 |
12.53 |
| 2026-10-06 00:00 |
21:40:58.12 |
-75:23:24.4 |
HIP 107309 |
12.86 |
| 2026-10-06 12:00 |
21:40:54.25 |
-75:23:08.7 |
HIP 107309 |
13.19 |
| 2026-10-07 00:00 |
21:40:50.42 |
-75:22:52.8 |
HIP 107309 |
13.53 |
| 2026-10-07 12:00 |
21:40:46.63 |
-75:22:36.7 |
HIP 107309 |
13.86 |
| 2026-10-08 00:00 |
21:40:42.89 |
-75:22:20.5 |
HIP 107309 |
14.20 |
| 2026-10-08 12:00 |
21:40:39.19 |
-75:22:04.2 |
HIP 107309 |
14.53 |
| 2026-10-09 00:00 |
21:40:35.54 |
-75:21:47.7 |
HIP 107309 |
14.87 |
| 2026-10-09 12:00 |
21:40:31.94 |
-75:21:31.0 |
HIP 107309 |
15.20 |
| 2026-10-10 00:00 |
21:40:28.38 |
-75:21:14.3 |
HIP 107309 |
15.53 |
| 2026-10-10 12:00 |
21:40:24.87 |
-75:20:57.4 |
HIP 107309 |
15.87 |
| 2026-10-11 00:00 |
21:40:21.41 |
-75:20:40.3 |
HIP 107309 |
16.20 |