메타데이터
| 항목 |
값 |
| Designation |
C/2013 U2 (Holvorcem) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-10-25T20:53:27.847680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
471 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2014-11-05.0000000 |
| e |
0.99429888 |
| q (au) |
5.116737 |
| a (au) |
897.497310 |
| i (deg) |
43.094095 |
| Ω (om, deg) |
7.001119 |
| ω (w, deg) |
107.375509 |
| M (ma, deg) |
0.000371 |
밝기
산란 + 전체 선형
$$
M_a = (2.650 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
2.650 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.503 |
| k |
1.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2013-10-23 |
2014-10-24 |
+10.6160 |
-7.950 |
| 2014-11-29 |
2016-03-11 |
+5.6262 |
-4.008 |
| 2016-03-11 |
2017-03-27 |
+0.3891 |
-0.346 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
14:32:41.24 |
-51:26:54.2 |
HIP 71089 |
7.58 |
| 2026-03-26 12:00 |
14:32:35.71 |
-51:27:12.5 |
HIP 71089 |
7.47 |
| 2026-03-27 00:00 |
14:32:30.14 |
-51:27:30.4 |
HIP 71089 |
7.47 |
| 2026-03-27 12:00 |
14:32:24.53 |
-51:27:47.8 |
HIP 71089 |
7.57 |
| 2026-03-28 00:00 |
14:32:18.88 |
-51:28:04.9 |
HIP 71089 |
7.77 |
| 2026-03-28 12:00 |
14:32:13.19 |
-51:28:21.5 |
HIP 71089 |
8.06 |
| 2026-03-29 00:00 |
14:32:07.46 |
-51:28:37.6 |
HIP 71089 |
8.45 |
| 2026-03-29 12:00 |
14:32:01.70 |
-51:28:53.4 |
HIP 71089 |
8.90 |
| 2026-03-30 00:00 |
14:31:55.89 |
-51:29:08.7 |
HIP 71001 |
8.78 |
| 2026-03-30 12:00 |
14:31:50.05 |
-51:29:23.6 |
HIP 71001 |
8.35 |
| 2026-03-31 00:00 |
14:31:44.18 |
-51:29:38.1 |
HIP 71001 |
8.00 |
| 2026-03-31 12:00 |
14:31:38.27 |
-51:29:52.1 |
HIP 71001 |
7.75 |
| 2026-04-01 00:00 |
14:31:32.32 |
-51:30:05.8 |
HIP 71001 |
7.60 |
| 2026-04-01 12:00 |
14:31:26.34 |
-51:30:19.0 |
HIP 71001 |
7.55 |
| 2026-04-02 00:00 |
14:31:20.33 |
-51:30:31.7 |
HIP 71001 |
7.63 |
| 2026-04-02 12:00 |
14:31:14.28 |
-51:30:44.0 |
HIP 71001 |
7.81 |
| 2026-04-03 00:00 |
14:31:08.21 |
-51:30:55.9 |
HIP 71001 |
8.10 |
| 2026-04-03 12:00 |
14:31:02.09 |
-51:31:07.4 |
HIP 71001 |
8.48 |
| 2026-04-04 00:00 |
14:30:55.95 |
-51:31:18.4 |
HIP 71001 |
8.95 |
| 2026-04-04 12:00 |
14:30:49.78 |
-51:31:29.0 |
HIP 71001 |
9.49 |
| 2026-04-05 00:00 |
14:30:43.57 |
-51:31:39.2 |
HIP 71001 |
10.09 |
| 2026-04-05 12:00 |
14:30:37.34 |
-51:31:48.9 |
HIP 71001 |
10.74 |
| 2026-04-06 00:00 |
14:30:31.07 |
-51:31:58.2 |
HIP 71001 |
11.44 |
| 2026-04-06 12:00 |
14:30:24.78 |
-51:32:07.0 |
HIP 71001 |
12.18 |
| 2026-04-07 00:00 |
14:30:18.46 |
-51:32:15.4 |
HIP 71001 |
12.95 |
| 2026-04-07 12:00 |
14:30:12.11 |
-51:32:23.4 |
HIP 71001 |
13.74 |
| 2026-04-08 00:00 |
14:30:05.73 |
-51:32:30.9 |
HIP 71001 |
14.56 |
| 2026-04-08 12:00 |
14:29:59.33 |
-51:32:38.0 |
HIP 71001 |
15.40 |
| 2026-04-09 00:00 |
14:29:52.90 |
-51:32:44.6 |
HIP 71001 |
16.26 |
| 2026-04-09 12:00 |
14:29:46.44 |
-51:32:50.9 |
HIP 71001 |
17.13 |
| 2026-04-10 00:00 |
14:29:39.96 |
-51:32:56.6 |
HIP 71001 |
18.02 |
| 2026-04-10 12:00 |
14:29:33.46 |
-51:33:02.0 |
HIP 71001 |
18.91 |
| 2026-04-11 00:00 |
14:29:26.93 |
-51:33:06.9 |
HIP 71001 |
19.82 |
| 2026-04-11 12:00 |
14:29:20.38 |
-51:33:11.3 |
HIP 71001 |
20.74 |
| 2026-04-12 00:00 |
14:29:13.81 |
-51:33:15.3 |
HIP 71001 |
21.67 |
| 2026-04-12 12:00 |
14:29:07.21 |
-51:33:18.9 |
HIP 71001 |
22.60 |
| 2026-04-13 00:00 |
14:29:00.60 |
-51:33:22.0 |
HIP 71001 |
23.55 |
| 2026-04-13 12:00 |
14:28:53.96 |
-51:33:24.7 |
HIP 71001 |
24.50 |
| 2026-04-14 00:00 |
14:28:47.30 |
-51:33:26.9 |
HIP 70589 |
25.23 |
| 2026-04-14 12:00 |
14:28:40.63 |
-51:33:28.7 |
HIP 70589 |
24.29 |
| 2026-04-15 00:00 |
14:28:33.93 |
-51:33:30.1 |
HIP 70589 |
23.35 |
| 2026-04-15 12:00 |
14:28:27.22 |
-51:33:31.0 |
HIP 70589 |
22.43 |
| 2026-04-16 00:00 |
14:28:20.49 |
-51:33:31.5 |
HIP 70589 |
21.52 |