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
$$
M_a = (14.198 + 2.119\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.198 |
| n |
2.119 |
| gf |
0.800 |
| gb |
-0.900 |
| k |
0.800 |
| δ90 |
9.972 |
| 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) |
| 2026-05-12 00:00 |
22:01:15.50 |
-74:42:53.0 |
HIP 108777 |
13.39 |
| 2026-05-12 12:00 |
22:01:16.34 |
-74:43:13.3 |
HIP 108777 |
13.71 |
| 2026-05-13 00:00 |
22:01:17.14 |
-74:43:33.6 |
HIP 108777 |
14.03 |
| 2026-05-13 12:00 |
22:01:17.88 |
-74:43:54.1 |
HIP 108777 |
14.34 |
| 2026-05-14 00:00 |
22:01:18.57 |
-74:44:14.5 |
HIP 108777 |
14.67 |
| 2026-05-14 12:00 |
22:01:19.21 |
-74:44:35.0 |
HIP 108777 |
14.99 |
| 2026-05-15 00:00 |
22:01:19.81 |
-74:44:55.6 |
HIP 108777 |
15.32 |
| 2026-05-15 12:00 |
22:01:20.35 |
-74:45:16.2 |
HIP 108777 |
15.65 |
| 2026-05-16 00:00 |
22:01:20.84 |
-74:45:36.9 |
HIP 108777 |
15.98 |
| 2026-05-16 12:00 |
22:01:21.28 |
-74:45:57.6 |
HIP 108777 |
16.32 |
| 2026-05-17 00:00 |
22:01:21.67 |
-74:46:18.4 |
HIP 108777 |
16.65 |
| 2026-05-17 12:00 |
22:01:22.01 |
-74:46:39.2 |
HIP 108777 |
16.99 |
| 2026-05-18 00:00 |
22:01:22.30 |
-74:47:00.1 |
HIP 108777 |
17.33 |
| 2026-05-18 12:00 |
22:01:22.54 |
-74:47:21.0 |
HIP 108777 |
17.67 |
| 2026-05-19 00:00 |
22:01:22.73 |
-74:47:41.9 |
HIP 108777 |
18.01 |
| 2026-05-19 12:00 |
22:01:22.86 |
-74:48:02.9 |
HIP 108777 |
18.35 |
| 2026-05-20 00:00 |
22:01:22.95 |
-74:48:23.9 |
HIP 108777 |
18.70 |
| 2026-05-20 12:00 |
22:01:22.98 |
-74:48:44.9 |
HIP 108777 |
19.04 |
| 2026-05-21 00:00 |
22:01:22.97 |
-74:49:06.0 |
HIP 108777 |
19.39 |
| 2026-05-21 12:00 |
22:01:22.90 |
-74:49:27.0 |
HIP 108777 |
19.74 |
| 2026-05-22 00:00 |
22:01:22.78 |
-74:49:48.2 |
HIP 108777 |
20.09 |
| 2026-05-22 12:00 |
22:01:22.62 |
-74:50:09.3 |
HIP 108777 |
20.44 |
| 2026-05-23 00:00 |
22:01:22.40 |
-74:50:30.5 |
HIP 108777 |
20.79 |
| 2026-05-23 12:00 |
22:01:22.13 |
-74:50:51.7 |
HIP 108777 |
21.14 |
| 2026-05-24 00:00 |
22:01:21.81 |
-74:51:12.9 |
HIP 108777 |
21.50 |
| 2026-05-24 12:00 |
22:01:21.43 |
-74:51:34.1 |
HIP 108777 |
21.85 |
| 2026-05-25 00:00 |
22:01:21.01 |
-74:51:55.4 |
HIP 108777 |
22.21 |
| 2026-05-25 12:00 |
22:01:20.54 |
-74:52:16.7 |
HIP 108777 |
22.56 |
| 2026-05-26 00:00 |
22:01:20.01 |
-74:52:37.9 |
HIP 108777 |
22.92 |
| 2026-05-26 12:00 |
22:01:19.44 |
-74:52:59.2 |
HIP 108777 |
23.27 |
| 2026-05-27 00:00 |
22:01:18.81 |
-74:53:20.6 |
HIP 108777 |
23.63 |
| 2026-05-27 12:00 |
22:01:18.13 |
-74:53:41.9 |
HIP 108777 |
23.99 |
| 2026-05-28 00:00 |
22:01:17.41 |
-74:54:03.2 |
HIP 108777 |
24.35 |
| 2026-05-28 12:00 |
22:01:16.63 |
-74:54:24.5 |
HIP 108777 |
24.71 |
| 2026-05-29 00:00 |
22:01:15.80 |
-74:54:45.9 |
HIP 108777 |
25.07 |
| 2026-05-29 12:00 |
22:01:14.92 |
-74:55:07.2 |
HIP 108777 |
25.43 |
| 2026-05-30 00:00 |
22:01:13.99 |
-74:55:28.6 |
HIP 108777 |
25.79 |
| 2026-05-30 12:00 |
22:01:13.01 |
-74:55:49.9 |
HIP 108777 |
26.15 |
| 2026-05-31 00:00 |
22:01:11.98 |
-74:56:11.3 |
HIP 108777 |
26.51 |
| 2026-05-31 12:00 |
22:01:10.89 |
-74:56:32.6 |
HIP 108777 |
26.87 |
| 2026-06-01 00:00 |
22:01:09.76 |
-74:56:53.9 |
HIP 108777 |
27.23 |
| 2026-06-01 12:00 |
22:01:08.58 |
-74:57:15.3 |
HIP 108777 |
27.60 |
| 2026-06-02 00:00 |
22:01:07.34 |
-74:57:36.6 |
HIP 108777 |
27.96 |