메타데이터
| 항목 |
값 |
| Designation |
C/1999 F2 (Dalcanton) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-08-23T16:33:57.314880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
7.800 |
| K1 |
7.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1999-09-29.0000000 |
| e |
0.99821105 |
| q (au) |
4.718078 |
| a (au) |
2637.338054 |
| i (deg) |
56.427410 |
| Ω (om, deg) |
210.297746 |
| ω (w, deg) |
352.352637 |
| M (ma, deg) |
0.002920 |
밝기
산란 + 전체 선형
$$
M_a = (5.004 + 5.237\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.004 |
| n |
5.237 |
| gf |
0.998 |
| gb |
-0.608 |
| k |
0.800 |
| δ90 |
10.000 |
| 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) |
| 2026-05-12 00:00 |
23:07:29.06 |
+33:00:43.6 |
HIP 114121 |
9.84 |
| 2026-05-12 12:00 |
23:07:30.38 |
+33:01:08.3 |
HIP 114121 |
10.08 |
| 2026-05-13 00:00 |
23:07:31.69 |
+33:01:33.1 |
HIP 114121 |
10.34 |
| 2026-05-13 12:00 |
23:07:32.98 |
+33:01:57.8 |
HIP 114121 |
10.60 |
| 2026-05-14 00:00 |
23:07:34.24 |
+33:02:22.6 |
HIP 114121 |
10.88 |
| 2026-05-14 12:00 |
23:07:35.48 |
+33:02:47.3 |
HIP 114121 |
11.17 |
| 2026-05-15 00:00 |
23:07:36.71 |
+33:03:12.0 |
HIP 114121 |
11.47 |
| 2026-05-15 12:00 |
23:07:37.91 |
+33:03:36.7 |
HIP 114121 |
11.78 |
| 2026-05-16 00:00 |
23:07:39.09 |
+33:04:01.4 |
HIP 114121 |
12.09 |
| 2026-05-16 12:00 |
23:07:40.25 |
+33:04:26.1 |
HIP 114121 |
12.41 |
| 2026-05-17 00:00 |
23:07:41.39 |
+33:04:50.8 |
HIP 114121 |
12.74 |
| 2026-05-17 12:00 |
23:07:42.50 |
+33:05:15.4 |
HIP 114121 |
13.07 |
| 2026-05-18 00:00 |
23:07:43.60 |
+33:05:40.1 |
HIP 114121 |
13.40 |
| 2026-05-18 12:00 |
23:07:44.67 |
+33:06:04.7 |
HIP 114121 |
13.74 |
| 2026-05-19 00:00 |
23:07:45.73 |
+33:06:29.2 |
HIP 114121 |
14.08 |
| 2026-05-19 12:00 |
23:07:46.76 |
+33:06:53.8 |
HIP 114121 |
14.42 |
| 2026-05-20 00:00 |
23:07:47.77 |
+33:07:18.3 |
HIP 114121 |
14.77 |
| 2026-05-20 12:00 |
23:07:48.75 |
+33:07:42.8 |
HIP 114121 |
15.12 |
| 2026-05-21 00:00 |
23:07:49.72 |
+33:08:07.3 |
HIP 114121 |
15.46 |
| 2026-05-21 12:00 |
23:07:50.66 |
+33:08:31.7 |
HIP 114121 |
15.81 |
| 2026-05-22 00:00 |
23:07:51.58 |
+33:08:56.1 |
HIP 114121 |
16.16 |
| 2026-05-22 12:00 |
23:07:52.48 |
+33:09:20.5 |
HIP 114121 |
16.51 |
| 2026-05-23 00:00 |
23:07:53.36 |
+33:09:44.8 |
HIP 114121 |
16.86 |
| 2026-05-23 12:00 |
23:07:54.22 |
+33:10:09.0 |
HIP 114121 |
17.22 |
| 2026-05-24 00:00 |
23:07:55.05 |
+33:10:33.3 |
HIP 114121 |
17.57 |
| 2026-05-24 12:00 |
23:07:55.86 |
+33:10:57.5 |
HIP 114121 |
17.92 |
| 2026-05-25 00:00 |
23:07:56.65 |
+33:11:21.6 |
HIP 114121 |
18.27 |
| 2026-05-25 12:00 |
23:07:57.42 |
+33:11:45.7 |
HIP 114121 |
18.61 |
| 2026-05-26 00:00 |
23:07:58.16 |
+33:12:09.8 |
HIP 114121 |
18.96 |
| 2026-05-26 12:00 |
23:07:58.89 |
+33:12:33.8 |
HIP 114121 |
19.31 |
| 2026-05-27 00:00 |
23:07:59.59 |
+33:12:57.7 |
HIP 114121 |
19.66 |
| 2026-05-27 12:00 |
23:08:00.27 |
+33:13:21.6 |
HIP 114121 |
20.00 |
| 2026-05-28 00:00 |
23:08:00.92 |
+33:13:45.4 |
HIP 114121 |
20.34 |
| 2026-05-28 12:00 |
23:08:01.56 |
+33:14:09.2 |
HIP 114121 |
20.68 |
| 2026-05-29 00:00 |
23:08:02.17 |
+33:14:32.9 |
HIP 114121 |
21.02 |
| 2026-05-29 12:00 |
23:08:02.76 |
+33:14:56.6 |
HIP 114121 |
21.36 |
| 2026-05-30 00:00 |
23:08:03.32 |
+33:15:20.2 |
HIP 114121 |
21.70 |
| 2026-05-30 12:00 |
23:08:03.87 |
+33:15:43.7 |
HIP 114121 |
22.03 |
| 2026-05-31 00:00 |
23:08:04.39 |
+33:16:07.2 |
HIP 114121 |
22.37 |
| 2026-05-31 12:00 |
23:08:04.89 |
+33:16:30.6 |
HIP 114121 |
22.70 |
| 2026-06-01 00:00 |
23:08:05.37 |
+33:16:54.0 |
HIP 114121 |
23.03 |
| 2026-06-01 12:00 |
23:08:05.82 |
+33:17:17.2 |
HIP 114121 |
23.35 |
| 2026-06-02 00:00 |
23:08:06.25 |
+33:17:40.4 |
HIP 114121 |
23.68 |