메타데이터
| 항목 |
값 |
| Designation |
C/1991 F2 (Helin-Lawrence) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-01-20T00:37:43.368960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
108 |
| NEO |
- |
| M1 |
9.100 |
| K1 |
5.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1991-12-22.0000000 |
| e |
1.00042110 |
| q (au) |
1.517723 |
| a (au) |
-3604.185791 |
| i (deg) |
95.456559 |
| Ω (om, deg) |
11.835020 |
| ω (w, deg) |
271.158650 |
| M (ma, deg) |
-0.000132 |
밝기
산란 + 전체 선형
$$
M_a = (9.280 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.280 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.848 |
| δ90 |
1.000 |
| 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 |
20:25:23.11 |
+59:57:15.5 |
HIP 100727 |
3.55 |
| 2026-09-20 12:00 |
20:25:20.68 |
+59:56:50.9 |
HIP 100727 |
3.90 |
| 2026-09-21 00:00 |
20:25:18.28 |
+59:56:26.1 |
HIP 100727 |
4.29 |
| 2026-09-21 12:00 |
20:25:15.91 |
+59:56:01.1 |
HIP 100727 |
4.70 |
| 2026-09-22 00:00 |
20:25:13.56 |
+59:55:36.0 |
HIP 100727 |
5.13 |
| 2026-09-22 12:00 |
20:25:11.25 |
+59:55:10.8 |
HIP 100727 |
5.58 |
| 2026-09-23 00:00 |
20:25:08.97 |
+59:54:45.4 |
HIP 100727 |
6.04 |
| 2026-09-23 12:00 |
20:25:06.71 |
+59:54:19.9 |
HIP 100727 |
6.51 |
| 2026-09-24 00:00 |
20:25:04.48 |
+59:53:54.3 |
HIP 100727 |
6.98 |
| 2026-09-24 12:00 |
20:25:02.28 |
+59:53:28.5 |
HIP 100727 |
7.46 |
| 2026-09-25 00:00 |
20:25:00.12 |
+59:53:02.6 |
HIP 100727 |
7.95 |
| 2026-09-25 12:00 |
20:24:57.98 |
+59:52:36.6 |
HIP 100727 |
8.44 |
| 2026-09-26 00:00 |
20:24:55.87 |
+59:52:10.4 |
HIP 100727 |
8.93 |
| 2026-09-26 12:00 |
20:24:53.79 |
+59:51:44.2 |
HIP 100727 |
9.43 |
| 2026-09-27 00:00 |
20:24:51.74 |
+59:51:17.8 |
HIP 100727 |
9.93 |
| 2026-09-27 12:00 |
20:24:49.72 |
+59:50:51.3 |
HIP 100727 |
10.42 |
| 2026-09-28 00:00 |
20:24:47.73 |
+59:50:24.6 |
HIP 100727 |
10.93 |
| 2026-09-28 12:00 |
20:24:45.77 |
+59:49:57.9 |
HIP 100727 |
11.43 |
| 2026-09-29 00:00 |
20:24:43.84 |
+59:49:31.0 |
HIP 100545 |
11.66 |
| 2026-09-29 12:00 |
20:24:41.94 |
+59:49:04.0 |
HIP 100545 |
11.32 |
| 2026-09-30 00:00 |
20:24:40.07 |
+59:48:37.0 |
HIP 100545 |
11.01 |
| 2026-09-30 12:00 |
20:24:38.23 |
+59:48:09.8 |
HIP 100545 |
10.71 |
| 2026-10-01 00:00 |
20:24:36.43 |
+59:47:42.5 |
HIP 100545 |
10.43 |
| 2026-10-01 12:00 |
20:24:34.65 |
+59:47:15.1 |
HIP 100545 |
10.17 |
| 2026-10-02 00:00 |
20:24:32.91 |
+59:46:47.6 |
HIP 100545 |
9.94 |
| 2026-10-02 12:00 |
20:24:31.19 |
+59:46:20.0 |
HIP 100545 |
9.73 |
| 2026-10-03 00:00 |
20:24:29.51 |
+59:45:52.3 |
HIP 100545 |
9.54 |
| 2026-10-03 12:00 |
20:24:27.86 |
+59:45:24.5 |
HIP 100545 |
9.39 |
| 2026-10-04 00:00 |
20:24:26.24 |
+59:44:56.6 |
HIP 100545 |
9.26 |
| 2026-10-04 12:00 |
20:24:24.66 |
+59:44:28.6 |
HIP 100545 |
9.17 |
| 2026-10-05 00:00 |
20:24:23.10 |
+59:44:00.5 |
HIP 100545 |
9.10 |
| 2026-10-05 12:00 |
20:24:21.58 |
+59:43:32.4 |
HIP 100545 |
9.07 |
| 2026-10-06 00:00 |
20:24:20.09 |
+59:43:04.1 |
HIP 100714 |
9.06 |
| 2026-10-06 12:00 |
20:24:18.63 |
+59:42:35.8 |
HIP 100714 |
8.82 |
| 2026-10-07 00:00 |
20:24:17.21 |
+59:42:07.4 |
HIP 100714 |
8.59 |
| 2026-10-07 12:00 |
20:24:15.81 |
+59:41:38.9 |
HIP 100714 |
8.39 |
| 2026-10-08 00:00 |
20:24:14.45 |
+59:41:10.4 |
HIP 100714 |
8.21 |
| 2026-10-08 12:00 |
20:24:13.12 |
+59:40:41.7 |
HIP 100714 |
8.06 |
| 2026-10-09 00:00 |
20:24:11.83 |
+59:40:13.0 |
HIP 100714 |
7.93 |
| 2026-10-09 12:00 |
20:24:10.57 |
+59:39:44.2 |
HIP 100714 |
7.83 |
| 2026-10-10 00:00 |
20:24:09.34 |
+59:39:15.4 |
HIP 100714 |
7.75 |
| 2026-10-10 12:00 |
20:24:08.14 |
+59:38:46.5 |
HIP 100714 |
7.70 |
| 2026-10-11 00:00 |
20:24:06.98 |
+59:38:17.5 |
HIP 100714 |
7.68 |