メタデータ
| 項目 |
値 |
| Designation |
C/1913 Y1 (Delavan) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1914-10-26T18:27:07.724160Z |
| Orbit solution date (soln_date, UTC) |
2024-04-15T15:43:28Z |
| Obs used |
157 |
| NEO |
- |
| M1 |
4.800 |
| K1 |
4.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1914-03-15.0000000 |
| e |
1.00014579 |
| q (au) |
1.104401 |
| a (au) |
-7575.468577 |
| i (deg) |
68.042932 |
| Ω (om, deg) |
60.397252 |
| ω (w, deg) |
97.469440 |
| M (ma, deg) |
-0.000337 |
等級
散乱 + 全体線形
$$
M_a = (-2.437 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-2.437 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
01:47:32.23 |
-70:00:09.7 |
HIP 8394 |
5.66 |
| 2026-03-26 12:00 |
01:47:34.53 |
-70:00:03.2 |
HIP 8394 |
5.60 |
| 2026-03-27 00:00 |
01:47:36.83 |
-69:59:56.8 |
HIP 8394 |
5.55 |
| 2026-03-27 12:00 |
01:47:39.14 |
-69:59:50.6 |
HIP 8394 |
5.50 |
| 2026-03-28 00:00 |
01:47:41.46 |
-69:59:44.4 |
HIP 8394 |
5.47 |
| 2026-03-28 12:00 |
01:47:43.79 |
-69:59:38.4 |
HIP 8394 |
5.44 |
| 2026-03-29 00:00 |
01:47:46.12 |
-69:59:32.4 |
HIP 8394 |
5.41 |
| 2026-03-29 12:00 |
01:47:48.46 |
-69:59:26.6 |
HIP 8394 |
5.40 |
| 2026-03-30 00:00 |
01:47:50.81 |
-69:59:20.8 |
HIP 8394 |
5.39 |
| 2026-03-30 12:00 |
01:47:53.17 |
-69:59:15.2 |
HIP 8394 |
5.39 |
| 2026-03-31 00:00 |
01:47:55.53 |
-69:59:09.7 |
HIP 8394 |
5.40 |
| 2026-03-31 12:00 |
01:47:57.90 |
-69:59:04.2 |
HIP 8394 |
5.41 |
| 2026-04-01 00:00 |
01:48:00.27 |
-69:58:58.9 |
HIP 8394 |
5.43 |
| 2026-04-01 12:00 |
01:48:02.66 |
-69:58:53.7 |
HIP 8394 |
5.46 |
| 2026-04-02 00:00 |
01:48:05.04 |
-69:58:48.6 |
HIP 8394 |
5.49 |
| 2026-04-02 12:00 |
01:48:07.44 |
-69:58:43.6 |
HIP 8394 |
5.54 |
| 2026-04-03 00:00 |
01:48:09.84 |
-69:58:38.7 |
HIP 8394 |
5.58 |
| 2026-04-03 12:00 |
01:48:12.24 |
-69:58:33.9 |
HIP 8394 |
5.64 |
| 2026-04-04 00:00 |
01:48:14.65 |
-69:58:29.3 |
HIP 8394 |
5.70 |
| 2026-04-04 12:00 |
01:48:17.07 |
-69:58:24.7 |
HIP 8394 |
5.77 |
| 2026-04-05 00:00 |
01:48:19.49 |
-69:58:20.2 |
HIP 8394 |
5.84 |
| 2026-04-05 12:00 |
01:48:21.92 |
-69:58:15.9 |
HIP 8394 |
5.92 |
| 2026-04-06 00:00 |
01:48:24.35 |
-69:58:11.6 |
HIP 8394 |
6.00 |
| 2026-04-06 12:00 |
01:48:26.79 |
-69:58:07.5 |
HIP 8394 |
6.09 |
| 2026-04-07 00:00 |
01:48:29.23 |
-69:58:03.5 |
HIP 8394 |
6.18 |
| 2026-04-07 12:00 |
01:48:31.68 |
-69:57:59.6 |
HIP 8394 |
6.28 |
| 2026-04-08 00:00 |
01:48:34.13 |
-69:57:55.8 |
HIP 8394 |
6.38 |
| 2026-04-08 12:00 |
01:48:36.58 |
-69:57:52.1 |
HIP 8394 |
6.48 |
| 2026-04-09 00:00 |
01:48:39.04 |
-69:57:48.5 |
HIP 8394 |
6.59 |
| 2026-04-09 12:00 |
01:48:41.50 |
-69:57:45.0 |
HIP 8394 |
6.71 |
| 2026-04-10 00:00 |
01:48:43.97 |
-69:57:41.7 |
HIP 8394 |
6.82 |
| 2026-04-10 12:00 |
01:48:46.44 |
-69:57:38.4 |
HIP 8394 |
6.94 |
| 2026-04-11 00:00 |
01:48:48.91 |
-69:57:35.3 |
HIP 8394 |
7.07 |
| 2026-04-11 12:00 |
01:48:51.38 |
-69:57:32.3 |
HIP 8394 |
7.19 |
| 2026-04-12 00:00 |
01:48:53.86 |
-69:57:29.3 |
HIP 8394 |
7.32 |
| 2026-04-12 12:00 |
01:48:56.34 |
-69:57:26.5 |
HIP 8394 |
7.45 |
| 2026-04-13 00:00 |
01:48:58.83 |
-69:57:23.8 |
HIP 8394 |
7.59 |
| 2026-04-13 12:00 |
01:49:01.31 |
-69:57:21.3 |
HIP 8394 |
7.72 |
| 2026-04-14 00:00 |
01:49:03.80 |
-69:57:18.8 |
HIP 8394 |
7.86 |
| 2026-04-14 12:00 |
01:49:06.29 |
-69:57:16.5 |
HIP 8394 |
8.00 |
| 2026-04-15 00:00 |
01:49:08.79 |
-69:57:14.2 |
HIP 8394 |
8.14 |
| 2026-04-15 12:00 |
01:49:11.28 |
-69:57:12.1 |
HIP 8394 |
8.29 |
| 2026-04-16 00:00 |
01:49:13.78 |
-69:57:10.1 |
HIP 8394 |
8.43 |