메타데이터
| 항목 |
값 |
| Designation |
C/1898 R1 (Perrine-Chofardet) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1898-10-21T00:56:12.053760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:56Z |
| Obs used |
71 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1898-09-21.0000000 |
| e |
1.00003407 |
| q (au) |
0.420481 |
| a (au) |
-12342.273054 |
| i (deg) |
28.858333 |
| Ω (om, deg) |
36.291475 |
| ω (w, deg) |
162.363692 |
| M (ma, deg) |
-0.000022 |
밝기
산란 + 전체 선형
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
01:14:40.92 |
-04:17:40.5 |
HIP 5845 |
31.21 |
| 2026-07-29 12:00 |
01:14:40.71 |
-04:17:44.2 |
HIP 5845 |
31.28 |
| 2026-07-30 00:00 |
01:14:40.50 |
-04:17:48.0 |
HIP 5845 |
31.35 |
| 2026-07-30 12:00 |
01:14:40.28 |
-04:17:51.7 |
HIP 5845 |
31.42 |
| 2026-07-31 00:00 |
01:14:40.05 |
-04:17:55.6 |
HIP 5845 |
31.49 |
| 2026-07-31 12:00 |
01:14:39.82 |
-04:17:59.4 |
HIP 5845 |
31.56 |
| 2026-08-01 00:00 |
01:14:39.58 |
-04:18:03.3 |
HIP 5845 |
31.64 |
| 2026-08-01 12:00 |
01:14:39.33 |
-04:18:07.2 |
HIP 5845 |
31.71 |
| 2026-08-02 00:00 |
01:14:39.08 |
-04:18:11.1 |
HIP 5845 |
31.78 |
| 2026-08-02 12:00 |
01:14:38.83 |
-04:18:15.0 |
HIP 5845 |
31.86 |
| 2026-08-03 00:00 |
01:14:38.56 |
-04:18:19.0 |
HIP 5845 |
31.94 |
| 2026-08-03 12:00 |
01:14:38.29 |
-04:18:23.0 |
HIP 5845 |
32.01 |
| 2026-08-04 00:00 |
01:14:38.02 |
-04:18:27.1 |
HIP 5845 |
32.09 |
| 2026-08-04 12:00 |
01:14:37.73 |
-04:18:31.2 |
HIP 5845 |
32.17 |
| 2026-08-05 00:00 |
01:14:37.45 |
-04:18:35.3 |
HIP 5845 |
32.25 |
| 2026-08-05 12:00 |
01:14:37.15 |
-04:18:39.4 |
HIP 5845 |
32.33 |
| 2026-08-06 00:00 |
01:14:36.85 |
-04:18:43.6 |
HIP 5845 |
32.42 |
| 2026-08-06 12:00 |
01:14:36.54 |
-04:18:47.7 |
HIP 5845 |
32.50 |
| 2026-08-07 00:00 |
01:14:36.23 |
-04:18:52.0 |
HIP 5845 |
32.58 |
| 2026-08-07 12:00 |
01:14:35.91 |
-04:18:56.2 |
HIP 5845 |
32.67 |
| 2026-08-08 00:00 |
01:14:35.59 |
-04:19:00.5 |
HIP 5845 |
32.75 |
| 2026-08-08 12:00 |
01:14:35.26 |
-04:19:04.8 |
HIP 5845 |
32.84 |
| 2026-08-09 00:00 |
01:14:34.92 |
-04:19:09.1 |
HIP 5845 |
32.92 |
| 2026-08-09 12:00 |
01:14:34.58 |
-04:19:13.4 |
HIP 5845 |
33.01 |
| 2026-08-10 00:00 |
01:14:34.23 |
-04:19:17.8 |
HIP 5845 |
33.10 |
| 2026-08-10 12:00 |
01:14:33.88 |
-04:19:22.2 |
HIP 5754 |
33.15 |
| 2026-08-11 00:00 |
01:14:33.52 |
-04:19:26.6 |
HIP 5754 |
33.05 |
| 2026-08-11 12:00 |
01:14:33.15 |
-04:19:31.1 |
HIP 5754 |
32.95 |
| 2026-08-12 00:00 |
01:14:32.78 |
-04:19:35.5 |
HIP 5754 |
32.85 |
| 2026-08-12 12:00 |
01:14:32.40 |
-04:19:40.0 |
HIP 5754 |
32.75 |
| 2026-08-13 00:00 |
01:14:32.02 |
-04:19:44.5 |
HIP 5754 |
32.65 |
| 2026-08-13 12:00 |
01:14:31.63 |
-04:19:49.1 |
HIP 5754 |
32.55 |
| 2026-08-14 00:00 |
01:14:31.23 |
-04:19:53.7 |
HIP 5754 |
32.45 |
| 2026-08-14 12:00 |
01:14:30.83 |
-04:19:58.2 |
HIP 5754 |
32.35 |
| 2026-08-15 00:00 |
01:14:30.43 |
-04:20:02.9 |
HIP 5754 |
32.24 |
| 2026-08-15 12:00 |
01:14:30.02 |
-04:20:07.5 |
HIP 5754 |
32.14 |
| 2026-08-16 00:00 |
01:14:29.60 |
-04:20:12.1 |
HIP 5754 |
32.03 |
| 2026-08-16 12:00 |
01:14:29.18 |
-04:20:16.8 |
HIP 5754 |
31.93 |
| 2026-08-17 00:00 |
01:14:28.75 |
-04:20:21.5 |
HIP 5754 |
31.82 |
| 2026-08-17 12:00 |
01:14:28.31 |
-04:20:26.2 |
HIP 5754 |
31.72 |
| 2026-08-18 00:00 |
01:14:27.87 |
-04:20:30.9 |
HIP 5754 |
31.61 |
| 2026-08-18 12:00 |
01:14:27.43 |
-04:20:35.7 |
HIP 5754 |
31.50 |
| 2026-08-19 00:00 |
01:14:26.98 |
-04:20:40.5 |
HIP 5754 |
31.39 |