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) |
| 2026-09-20 00:00 |
01:13:48.62 |
-04:26:09.6 |
HIP 5754 |
24.69 |
| 2026-09-20 12:00 |
01:13:47.90 |
-04:26:14.8 |
HIP 5754 |
24.61 |
| 2026-09-21 00:00 |
01:13:47.18 |
-04:26:20.0 |
HIP 5754 |
24.54 |
| 2026-09-21 12:00 |
01:13:46.45 |
-04:26:25.3 |
HIP 5754 |
24.46 |
| 2026-09-22 00:00 |
01:13:45.73 |
-04:26:30.5 |
HIP 5620 |
24.30 |
| 2026-09-22 12:00 |
01:13:45.00 |
-04:26:35.7 |
HIP 5620 |
24.11 |
| 2026-09-23 00:00 |
01:13:44.27 |
-04:26:40.9 |
HIP 5620 |
23.92 |
| 2026-09-23 12:00 |
01:13:43.54 |
-04:26:46.1 |
HIP 5620 |
23.73 |
| 2026-09-24 00:00 |
01:13:42.80 |
-04:26:51.3 |
HIP 5620 |
23.54 |
| 2026-09-24 12:00 |
01:13:42.06 |
-04:26:56.5 |
HIP 5620 |
23.34 |
| 2026-09-25 00:00 |
01:13:41.32 |
-04:27:01.6 |
HIP 5620 |
23.15 |
| 2026-09-25 12:00 |
01:13:40.58 |
-04:27:06.8 |
HIP 5620 |
22.96 |
| 2026-09-26 00:00 |
01:13:39.84 |
-04:27:11.9 |
HIP 5620 |
22.77 |
| 2026-09-26 12:00 |
01:13:39.09 |
-04:27:17.1 |
HIP 5620 |
22.57 |
| 2026-09-27 00:00 |
01:13:38.34 |
-04:27:22.2 |
HIP 5620 |
22.38 |
| 2026-09-27 12:00 |
01:13:37.59 |
-04:27:27.4 |
HIP 5620 |
22.18 |
| 2026-09-28 00:00 |
01:13:36.84 |
-04:27:32.5 |
HIP 5620 |
21.99 |
| 2026-09-28 12:00 |
01:13:36.09 |
-04:27:37.6 |
HIP 5620 |
21.79 |
| 2026-09-29 00:00 |
01:13:35.33 |
-04:27:42.7 |
HIP 5620 |
21.60 |
| 2026-09-29 12:00 |
01:13:34.58 |
-04:27:47.7 |
HIP 5620 |
21.41 |
| 2026-09-30 00:00 |
01:13:33.82 |
-04:27:52.8 |
HIP 5620 |
21.21 |
| 2026-09-30 12:00 |
01:13:33.06 |
-04:27:57.8 |
HIP 5620 |
21.01 |
| 2026-10-01 00:00 |
01:13:32.30 |
-04:28:02.9 |
HIP 5620 |
20.82 |
| 2026-10-01 12:00 |
01:13:31.54 |
-04:28:07.9 |
HIP 5620 |
20.62 |
| 2026-10-02 00:00 |
01:13:30.77 |
-04:28:12.9 |
HIP 5620 |
20.43 |
| 2026-10-02 12:00 |
01:13:30.01 |
-04:28:17.9 |
HIP 5620 |
20.23 |
| 2026-10-03 00:00 |
01:13:29.24 |
-04:28:22.9 |
HIP 5620 |
20.04 |
| 2026-10-03 12:00 |
01:13:28.47 |
-04:28:27.9 |
HIP 5620 |
19.84 |
| 2026-10-04 00:00 |
01:13:27.70 |
-04:28:32.8 |
HIP 5620 |
19.65 |
| 2026-10-04 12:00 |
01:13:26.93 |
-04:28:37.8 |
HIP 5620 |
19.45 |
| 2026-10-05 00:00 |
01:13:26.16 |
-04:28:42.7 |
HIP 5620 |
19.25 |
| 2026-10-05 12:00 |
01:13:25.39 |
-04:28:47.6 |
HIP 5620 |
19.06 |
| 2026-10-06 00:00 |
01:13:24.61 |
-04:28:52.5 |
HIP 5620 |
18.86 |
| 2026-10-06 12:00 |
01:13:23.84 |
-04:28:57.3 |
HIP 5620 |
18.67 |
| 2026-10-07 00:00 |
01:13:23.06 |
-04:29:02.2 |
HIP 5620 |
18.47 |
| 2026-10-07 12:00 |
01:13:22.29 |
-04:29:07.0 |
HIP 5620 |
18.28 |
| 2026-10-08 00:00 |
01:13:21.51 |
-04:29:11.8 |
HIP 5620 |
18.08 |
| 2026-10-08 12:00 |
01:13:20.73 |
-04:29:16.6 |
HIP 5620 |
17.89 |
| 2026-10-09 00:00 |
01:13:19.95 |
-04:29:21.4 |
HIP 5620 |
17.69 |
| 2026-10-09 12:00 |
01:13:19.17 |
-04:29:26.1 |
HIP 5620 |
17.50 |
| 2026-10-10 00:00 |
01:13:18.40 |
-04:29:30.9 |
HIP 5620 |
17.30 |
| 2026-10-10 12:00 |
01:13:17.62 |
-04:29:35.6 |
HIP 5620 |
17.11 |
| 2026-10-11 00:00 |
01:13:16.84 |
-04:29:40.3 |
HIP 5620 |
16.91 |